Letter Digit Substitution Test Research Articles

Dementia risk factors and cognitive function in a nationwide population-based sample aged 65+

Abstract Background Cognitive function is fundamental to healthy aging and independent living. As there is no cure for dementia, prevention of risk factors (e. g. physical inactivity, obesity, hypertension, diabetes, social isolation, depression) is crucial. The aim of our study was to analyze selected dementia risk factors and their association with cognitive function in people aged 65 years and older. Methods Cross-sectional data from the nationally representative examination Study on Health of Older People in Germany (Gesundheit 65+) conducted between 2022-2023 by the Robert Koch Institute (n = 1.493; 48% women; mean age 78.8 years). Cognitive function was assessed by the Letter Digit Substitution Test (LDST), a measure of general speed of information processing, and of the Consortium to Establish a Registry for Alzheimer’s Disease (CERAD) 10-word list delayed recall (WLR), a measure of memory. Weighted associations between age, sex, education, dementia risk scores and z-standardized test scores were examined using linear regression analysis. Results Higher age, male sex and lower level of education were significantly associated with lower z-scores in both tests (all p < 0.001). In separate models, all adjusted for age, sex and education, social isolation was associated with lower performance on both LDST (ß=-0.22; 95% confidence interval -0.42, -0.01) and CERAD WLR (ß=-0.21; -0.41, -0.01); depressive symptoms were associated with lower LDST z-scores (ß=-0.40; -0.67, -0.13), and physical inactivity with lower CERAD WLR z-scores (ß=-0.12; -0.24, -0.01). Obesity, hypertension, and diabetes were not significantly associated with any test. Conclusions Our findings from this nationwide general population study of old and very old adults show a clustering of reduced cognitive function with social isolation, symptoms of mental health impairments, and physical inactivity in old age which call for coordinated intersectoral health promotion and prevention activities. Key messages • The clustering of reduced cognition with dementia risk factors calls for intersectoral health actions. • Limitations in cognition should only be defined by age-, sex-, and education-specific norms.

2 Clinical Validity and Cut-Off Scores of a Brief Neuropsychological Battery for a Large Rural Population in Community Setting

Objective:There is a dearth of an appropriate standardized tool to assess neuropsychological functions in rural population, which has low literacy rates, are culturally diverse, and have limited access to healthcare resources. The NIREH Neuropsychological Battery for Rural Population (NINB-RP) is a relatively brief and easy-to-administer battery comprising multiple tests that are modified or adopted as per rural community settings to evaluate verbal learning, fine coordination, attention efficiency, executive task, concentration, and visual attention, mental flexibility, and motor coordination in rural populations. The present study aimed to examine the clinical validity and establish cut-off scores for impairment of neuropsychological functions for different age, gender, and education levels of NINB-RP in a rural community in central India.Participants and Methods:This was a prospective cross-sectional study conducted in participants aged > 18 years (n=2952, M: F=1407:1545) recruited through a stratified sampling technique from 23 randomly selected villages from central India. The data of nine neuropsychological tests [(Finger and Tweezer dexterity test (FDT, TDT); Digit Forward and Backward test (DFT, DBT); Serial subtraction test (SST); Trail Making-A and B; Finger Tapping test (FTT); and Letter Digit Substitution test, LDST)] from 215 cognitively impaired and 2737 healthy control subjects were analyzed. The tests were performed in a village school/community hall or an outdoor camp. Independent sample t-test, Chi-square test, and Receiver Operating Characteristic (ROC) curve were used to calculate the area under the curve (AUC), cut-off scores, and sensitivity (ST)/specificity (SP) values for seven conditions, i.e., gender (male vs. female), age groups (up to 49 years and above 50 years); and educational levels (illiterate, intermediate and college). For those variables where ST/SP values were lower than 0.70, a unique cut-off score was calculated for the entire sample, adjusting by age and educational levels.Results:A significant difference in mean (median) scores between the healthy control and cognitively impaired groups were observed in all tests except Trail Making A and B and LDST. The AUC for most of the tests ranged from 0.70 to 0.81, and the ST/SP values ranged from 69-73% and 65-75%, respectively. The results showed that most tests of NINB-RP reached moderate to good sensitivity and specificity for gender, age and education levels, except for DBT for females, above 50 years, and illiterate and intermediate education groups. FDT for males [AUC: 0.85 (95%CI0.80-0.91], ST/SP=76/82%] and females [(AUC=0.78 (95%CI0.74-0.82), ST/SP=71/70%], TDT for intermediate education group [AUC=0.82 (95%CI0.60-1.00), ST/SP=86/83%] and FTT for less than 49 years age group [AUC=0.75 (95%CI0.67-0.84), ST/SP=71/76%] were the most useful tests to discriminate among healthy control and cognitively impaired rural population.Conclusions:The present study is an attempt to establish the cut-off scores of a neuropsychological battery for a large rural population in the community setting. The proposed cut-off values might be helpful in clinical assessment in rural areas where clinical neuropsychology services are not readily available. NINB-RP can be a valuable tool for clinical research studies in rural communities. Further studies on similar samples in other countries need to be undertaken.

History of Traumatic Brain Injury in Relation to Cognitive Functioning, Memory Complaints, and Brain Structure in Mid-Life.

In this study, we investigated history of traumatic brain injury with loss of consciousness in relation to cognitive functioning, subjective memory complaints, and brain structure in mid-life. This study included 2005 participants (mean age: 47.6 years, standard deviation: 5.0, women: 65%) from the Origins of Alzheimer's Disease Across the Life Course (ORACLE) study between 2017 and 2020. History of traumatic brain injury was defined as at least one lifetime self-reported brain injury with loss of consciousness. Associations of history of traumatic brain injury with (1) cognitive functioning (measured with the 15-Word Learning Test, Stroop Task, Letter-Digit Substitution Test, Word Fluency Test, Purdue Pegboard Test, and Design Organization Test), (2) current subjective memory complaints (present/absent, measured with a survey), and (3) brain structure (total brain volume, frontal and temporal lobe volume, gray matter volume, white matter volume, white matter hyperintensities volume, infarcts, and microbleeds, measured with brain magnetic resonance imaging [MRI]) were assessed using linear or logistical regression models and adjusted for relevant confounders. In total, 250 of 2005 (12%) participants reported a history of traumatic brain injury. Of those who reported the time post-injury (n = 173), most participants (n = 151, 87%) reported that it had occurred >10 years ago. We found no associations between history of traumatic brain injury and any of the cognitive tests. We did find that a history of traumatic brain injury was associated with having mid-life subjective memory complaints (odds ratio [OR]: 1.87; 95% confidence interval [CI]: 1.35, 2.58). This association was also present when investigating only those who reported an injury >10 years ago (OR:1.69; 95% CI: 1.15, 2.50). Additionally, the association was stronger in those with >30 min loss of consciousness (OR: 3.57; 95% CI: 1.48, 8.59) than in those with <30 min loss of consciousness (OR: 1.85; 95% CI: 1.25, 2.74), when compared with those without history of traumatic brain injury. Lastly, we found no associations between history of traumatic brain injury and any of the structural brain MRI outcomes. In conclusion, our study suggests that at least one lifetime traumatic brain injury with loss of consciousness in mid-life is associated with long-term subjective memory complaints, but not with cognitive functioning or brain structure.

FC 104: Apathy Associates with Cognitive Dysfunction and Mortality in Older Ckd Patients

Abstract BACKGROUND AND AIMS The growing population of older patients with chronic kidney disease (CKD) often faces unidentified cognitive impairments and high prevalence of depressive symptoms. Apathy is a clinical syndrome associated with both depression and cognitive decline in community-dwelling older people. Furthermore, apathy has been more often linked to vascular impairments, which are also highly prevalent in the CKD population. However, so far, prevalence and consequences of apathy in older CKD patients have not been studied. We aimed (1) to investigate the prevalence of apathy symptoms in an older population with CKD stage G4/G5 (eGFR &amp;lt; 20 mL/min/1.73 m2), and (2) to assess if apathy is associated with, frailty, cognitive and functional impairments and mood. In addition, we (3) investigated the relation between apathy at baseline and mortality during four years of follow-up. METHOD Data was used from the prospective multicenter COPE (Cognitive Decline in Older Patients with ESKD) cohort, which included CKD patients aged ≥65 years with an eGFR of ≤20 mL/min/1.73 m2. Symptoms of apathy were assessed with the 3-item subscale of the 15-item Geriatric Depression (GDS-3A score ≥2) and depressive symptoms with the remaining items of this scale (GDS-12D ≥2). Frailty, (Fried Frailty Index ≥3), functional dependence (GARS score), handgrip strength and walking speed were measured. Cognitive functioning was assessed by means of global cognition (Mini Mental State Examination), visuoconstruction (Clock drawing), memory (15-Word Verbal Learning Test and Visual Association Test), executive function (Trail Making Test-B) and psychomotor speed (Letter Digit Substitution Test, Trail Making Test -A). Cross-sectional correlations between groups were tested with t-tests, Mann–Whitney and Chi-squared tests. Hazard ratio for mortality was analysed with Cox regression adjusting for age, gender and primary vascular kidney disease. RESULTS In total n = 180 patients, 67% male, were included with a median age of 75.5 years (IQR 71.0–80.9) and mean eGFR of 16.5 (SD 4.6). Symptoms of apathy and isolated apathy (i.e. with no symptoms of depression) were seen in respectively 36% (n = 64) and 17% (n = 30) of the study population. Presence of apathy symptoms at baseline was associated with primary vascular kidney disease (P = 0.031), depression (P &amp;lt; 0.001), frailty (P &amp;lt; 0.001) and decreased physical functioning (i.e. functional dependence; P &amp;lt; 0.001, handgrip strength; P = 0.026 and walking speed; P &amp;lt; 0.001). Presence of apathy symptoms was also associated with reduced executive function (P = 0.045) and psychomotor speed (P = 0.022). Furthermore, patients with apathy symptoms had a 1.9 times higher mortality risk (P = 0.022, adjusted for age, gender and primary vascular renal disease). CONCLUSION Symptoms of apathy occurred in one third of this cohort of older advanced CKD patients. Although apathy was associated with presence of depressive symptoms, half of the cases were not. Apathy is associated with multiple functional and cognitive measures and two-fold increased mortality. Future investigations should focus on cause of apathy and its value in predicting cognitive decline in older CKD patients. Because of the relation of apathy with future outcomes, assessment of apathy might be of value in shared decision making on renal replacement therapy in older CKD patients.

Information Processing Speed Assessed with Letter Digit Substitution Test in Croatian Sample of Multiple Sclerosis Patients.

Cognitive impairment is a common complaint in people with multiple sclerosis (pwMS). The study objective was to determine the psychometric properties of the letter digit substitution test (LDST) that measures information processing speed and to investigate the impact of relevant predictors of LDST achievement in pwMS. The design was cross-sectional. The study included 87 pwMS and 154 control subjects. The validity of LDST was examined, and a hierarchical regression model was used to explore relevant predictors of LDST success. The LDST had excellent construct validity, as expressed by differences between pwMS and control subjects. Convergent validity of the LDST was supported by a significant moderate correlation with the expanded disability status scale (EDSS) (ρ = −0.36; p < 0.05) and a significantly strong correlation with the multiple sclerosis impact scale (MSIS-29) physical subscale (r = −0.64; p < 0.01). The LDTS score well differentiated the pwMS considering age, education, EDSS, disease duration, comorbidity, and medication therapy. Using the LDST as a criterion variable in pwMS results showed consistent evidence for the age, education, and EDSS impact on LDST performance. The best cut-off score of ≤35 discriminated the control and MS group. LDST proved to be a valid test for assessing information processing speed in pwMS.

Anticholinergic drug burden according to the anticholinergic drug scale and the German anticholinergic burden and their impact on cognitive function in multimorbid elderly German people: a multicentre observational study

ObjectivesThe aims of our study were to examine the anticholinergic drug use and to assess the association between anticholinergic burden and cognitive function in the multimorbid elderly patients of the...

A randomized controlled trial into the cognitive effects of a computer-tailored physical activity intervention in older adults with chronic disease(s)

BackgroundCognitive functioning (CF) is important for wellbeing and an independent life. However, older adults with chronic diseases are at a higher risk of poorer CF levels. Although, research suggests that physical activity (PA) could play an essential role in maintaining good CF, older adults with chronic diseases have low levels of PA. PA interventions to prevent cognitive decline for this specific group exist. Yet, until now these interventions focused on a single specific chronic disease. Active Plus is a proven effective computer-tailored PA stimulating intervention focused on increasing PA in daily life for the older adult population suffering from a broad range of chronic diseases. This study tests the cognitive effects of Active Plus in older adults with chronic diseases.MethodsIn this RCT older adults with at least one chronic disease (≥65 years) were allocated to the intervention group (N = 260, mean age = 74.2) or waiting list control group (N = 325, mean age = 74.5). In total, intervention group participants received three times computer-tailored PA stimulating advice within four months (i.e., at baseline, after two months, and after three to four months). The online and print delivered advice were tailored to the specific needs and wishes of the participant and focused on incorporating PA in daily life. Baseline and follow-up measurements of the CF verbal memory (Verbal Learning Test), shifting (Trailmaking Test), inhibition (Stop-signal Task) and processing speed (Letter Digit Substitution Test) were assessed after six and 12 months. Intervention effects were analyzed with multilevel linear mixed-effects models adjusted for the clustered design and confounding variables.ResultsThe dropout rate was 19.1% after 6 months and 25.1% after 12 months. Although both conditions improved on all verbal memory outcomes after 6 months, and all CF outcomes except inhibition after 12 months, no intervention effects were found, not even in subgroups (p > .05).ConclusionsTo our knowledge this is the first study to test the cognitive effects of a computer-tailored PA stimulating intervention in older adults suffering from a broad range of chronic diseases. The effects of the Active Plus intervention were not strong enough to improve CF or prevent cognitive decline. A blended approach, in which this computer-tailored intervention is combined with a face-to-face PA intervention and / or cognitive training, might be a good suggestion to increase the effects of Active Plus on PA and CF in older adults with chronic diseases.Trial registrationNetherlands Trial Register NL6005; Date of Registration 03-21-2017; https://www.trialregister.nl/trial/6005

Cognitive performance in relation to metabolic disturbances in patients with COPD

Cognitive impairment (CI) and metabolic abnormalities, including the metabolic syndrome (MetS) and sarcopenia, are more prevalent in COPD patients compared to controls without diagnosed lung disease. Because earlier studies have shown these metabolic abnormalities may affect cognitive performance, this study investigated whether cognitive performance is more impaired in subgroups of COPD patients with MetS or sarcopenia. Cognitive performance patterns of 170 COPD patients referred for pulmonary rehabilitation (53.5% male, 63.4±9.4 years, FEV1 54.5±22.7% predicted) were compared between COPD subgroups stratified by presence of MetS and sarcopenia. Cognitive performance was assessed using a detailed neuropsychological test battery, which measured psychomotor speed (Stroop Color-Word Test, Concept Shifting Test, Letter-Digit Substitution Test), planning (Behavioral Assessment of the Dysexecutive Syndrome), working memory (Visual-Verbal Learning Test, Digit Span), verbal memory (Visual-Verbal Learning Test) and cognitive flexibility (Stroop Color-Word Test, Concept Shifting Test). MetS was determined according to the NCEP ATP-III criteria. Sarcopenia was determined based on decreased appendicular lean mass by dual-energy x-ray absorptiometry and impaired physical performance by 6-min walking distance. MetS was observed in 54.7% and sarcopenia in 30.0% of COPD patients. The prevalence of general CI was not different between patients with and without MetS (30.4% and 39.0%, respectively) or those with and without sarcopenia (34.0% and 34.5%, respectively, both p>0.05). Domain-specific cognitive performance was not different between metabolic subgroups, but those with sarcopenia displayed a lower prevalence of CI on verbal memory than those without (21.7% and 29.7%, respectively, p=0.011). Only the digit span (working memory) subtest was significantly different between metabolic subgroups, in favor of those without MetS (p=0.017). Cognitive performance was not affected more in COPD patients with sarcopenia or MetS.

Third follow-up of the Cardiovascular Risk Factors, Aging and Dementia (CAIDE) cohort investigating determinants of cognitive, physical, and psychosocial wellbeing among the oldest old: the CAIDE85+ study protocol

BackgroundThe oldest old is the fastest growing age group worldwide and the most prone to severe disability, especially in relation to loss of cognitive function. Improving our understanding of the predictors of cognitive, physical and psychosocial wellbeing among the oldest old can result in substantial benefits for the individuals and for the society as a whole.The Cardiovascular Risk Factors, Aging and Dementia (CAIDE) study investigated risk factors and determinants of cognitive impairment in a population-based longitudinal cohort, which was first examined between 1972 and 1992, when individuals were in their midlife, and re-assessed in 1998 and 2005–2009. Most of the study participants are currently aged 85 years or older. We aim to re-examine the cohort’s survivors and gain further insights on the mechanisms underlying both cognitive and overall healthy ageing at old age.MethodsCAIDE85+ is the third follow-up of the CAIDE study participants. All individuals still alive and living in the Kuopio and Joensuu areas of Eastern Finland, from the original CAIDE cohort (two random samples, N = 2000 + ~ 900), will be invited to a re-examination. The assessment includes self-reported data related to basic demographics and lifestyle, as well as psychosocial and physical health status. Cognitive and physical evaluations are also conducted. Blood biomarkers relevant for dementia and ageing are assessed.Primary outcomes are the measurements related to cognition and daily life functioning (CERAD, Trail Making Test-A, Letter-Digit Substitution Test, Clinical Dementia Rating and Activities of Daily Living). Secondary endpoints of the study are outcomes related to physical health status, psychosocial wellbeing, as well as age-related health indicators.DiscussionThrough a follow-up of more than 40 years, CAIDE85+ will provide invaluable information on the risk and protective factors that contribute to cognitive and physical health, as well as ageing and longevity.Study registrationThe present study protocol has been registered at https://clinicaltrials.gov/ (registration nr NCT03938727, date 03.05.2019).

Effect of Unilateral Left Nostril Breathing (Chandra Anga Pranayama) on Cognitive Function in Healthy Yoga-Naïve Individuals: A Randomized, Controlled, Pilot Study

Introduction: Breathing modulates cortical neuronal activity. Various breathing exercises are purported to have specific effects on emotional and cognitive functions. Objective: To determine the effect of unilateral left nostril breathing (ULNB) on nonlateralized, overall cognitive functions using computerized psychometric tests. Methods: A randomized, controlled, pilot study was conducted among 20 healthy yoga-naïve medical students. ULNB was performed for 15 min by the test group (n = 10) and breath awareness by the control group (n = 10). Attention and processing speed, memory, and executive function were assessed using the Letter-Digit Substitution Test, Sternberg Memory Task, and Victoria Stroop Test, respectively. Baseline, pre- and postintervention scores were recorded. Results: There was no significant difference between the groups in baseline scores. In the Sternberg Memory Task, a statistically significant decrease in response time was seen in the test (t(9) = 3.855, p = 0.004) as well as the control group (t(9) = 3.120, p = 0.012); there was no significant difference between the groups. No significant effect of UNLB was seen in the Letter-Digit Substitution Test and Stroop Test. Conclusions: Our study showed no difference in the effects of 15-min practice of ULNB and breath awareness on cognitive functions; both improved memory but not attention or executive function.

Cognitive and physical impairment and the risk of stroke \u2013 A prospective cohort study

The manifestation of cognitive and physical impairment in stroke patients before the acute event suggests accumulating subclinical vascular pathology in the brain. We investigated whether impairments in cognitive and physical functioning were associated with an increased stroke risk. Between 2002 and 2008, 8,519 stroke-free non-demented participants from the population-based Rotterdam Study underwent cognition and physical assessments including Mini-Mental State Examination, 15-word learning test, Stroop test, letter-digit substitution test, verbal fluency test, Purdue pegboard test and questionnaires on basic and instrumental activities of daily living (BADL; IADL). Principal component analysis was used to derive global cognition (G-factor). Incident stroke was assessed through continuous monitoring of medical records until 2016. Among 8,519 persons (mean age 66.0 years; 57.8% women), 489 suffered a stroke during mean follow-up of 8.7 years (SD: 2.9). Worse G-factor was associated with higher stroke risk (Hazard Ratio 1.21, 95% CI: 1.06–1.38), largely driven by unspecified stroke. Likewise, worse scores on 15-word learning test, Stroop test, Purdue pegboard test, IADL, and BADL were associated with higher risk of stroke. Thus both worse cognitive and physical functioning were associated with a higher stroke risk, in particular unspecified stroke and persons with worse memory, information processing, executive function, and motor function.

Anxiety in multiple sclerosis is related to depressive symptoms and cognitive complaints.

Multiple sclerosis (MS) patients suffer from high levels of anxiety. However, it is unclear which factors are related to anxiety, since study results are inconsistent, and the associated factors have not been examined comprehensively. In this study, we investigated the demographic, disease-related and psychological factors associated with anxiety in MS patients. Cross-sectional data of 119 MS patients were used. Anxiety and depressive symptoms (Hospital Anxiety and Depression Scale), fatigue (Fatigue Severity Scale), cognitive complaints (Cognitive Failures Questionnaire) and cognitive functioning (Wisconsin Card Sorting Test, Controlled Oral Word Association Test, Letter Digit Substitution Test, Concept Shifting Test, Wechsler Memory Test Faces and the Dutch version of the California Verbal Learning Test) were measured. Bivariate and multivariable regression analyses were conducted to test the associations between anxiety and potential contributing factors. In this sample, 42% of the MS patients had clinically significant levels of anxiety, defined by a score ≥8 on the anxiety subscale of the Hospital Anxiety and Depression Scale (HADS). A significant correlation was found between anxiety and depressive symptoms, fatigue, cognitive complaints and psychiatric history. In the multivariable analysis, only depressive symptoms and cognitive complaints remained significantly related to anxiety. Anxiety is common in MS patients and most strongly related to psychological factors. This knowledge can be taken into account when treating patients with MS. Further research is needed using longitudinal designs and incorporating other factors known to influence anxiety, such as coping, negative affectivity and social support.

AGE-RELATED HEARING LOSS AND COGNITIVE DECLINE IN THE GENERAL POPULATION

Hearing loss has recently been identified as a potentially modifiable risk factor for dementia.1-5 However, results from cross-sectional studies have been conflicting, possibly due to interrelated effects of age on both hearing and cognitive function or reverse causality. Therefore longitudinal population-based studies are needed to elucidate whether hearing loss is independently associated with cognitive decline, while adjusting for the effects of age over time. 4,306 non-demented participants (mean age 64.4 [SD: 6.9], 59.3% female) underwent baseline hearing assessment with pure-tone audiometry (2011-2014).6 Cognitive function was assessed at baseline and on average 4.4 years at follow-up (SD: 0.2), with an extensive test battery consisting of the MMSE, Stroop test, Word Fluency test (WFT), Letter Digit Substitution test (LDST), Word Learning test (WLT) and the Purdue Pegboard test (PPT). Linear mixed models were used to elucidate the longitudinal association between hearing loss and cognitive function for each test separately. Hearing loss was entered into the models on a continuous scale (per 10 decibel [dB] increase), and subsequently per degree of hearing loss (mild, moderate, severe), compared to none hearing loss. Follow-up time was used as the time variable and the models were adjusted for age, sex, education, and cardiovascular risk factors. In an extended model, we additionally adjusted for the interaction between age and follow-up time. Hearing loss per 10 dB increase did not alter cognitive function over time. When comparing the trajectories of degree of hearing loss of the cognitive test scores over time, we demonstrated that degree of hearing loss showed significant lower scores compared to none hearing loss for the MMSE, WFT, LDST, WLT, and PPT (figure 1). However, no significant slope differences remained after adjustment for the interaction between age and follow-up time (figure 2).

Assessment of stress and cognition among adolescent males and females

Background: The psychophysiological changes that people experience due to long-term cognitive activity is stress. Compared to adults, adolescents are more prone to stress due to change in the level of stress hormones. Stress has an impact on cognitive parameters. Stress and cognition can be modulated by the sex steroids. Hence, this study was done to know the gender difference in perceived stress and its effect on cognition among adolescents. Aims and Objectives: The aim of the study was to record and compare stress and cognition among male and female volunteers. Materials and Methods: After getting Institutional Ethical Committee clearance, informed written consent was obtained from all the participants. 30 male and 30 female volunteers were selected by simple random sampling method after applying inclusion and exclusion criteria. Stress was recorded using perceived stress scale, cognitive tests such as digit symbol substitution test (DSST), letter digit substitution test (LDST), mini-mental status examination (MMSE), Wechsler memory scale (WMS) revised-spatial addition subtest, design subtest, simple visual reaction time (SRT), choice visual reaction time (CRT), and critical flicker fusion frequency (CFFF) were recorded among male and female volunteers in the Department of Physiology, Sri Venkateshwaraa Medical College Hospital and Research center, Ariyur, Pondicherry. Results: Perceived stress scale is significantly decreased in females (P = 0.0046). Cognitive parameters such as LDST (P < 0.0001), WMS design (P = 0.0016), and MMSE (P = 0.0003) significantly increased among the females with less stress but DSST (P < 0.0001) significantly increased among the males. SRT, CRT, CFFF, and WMS spatial did not show any significant difference between both the genders. Conclusion: Thus, from this study, we conclude that stress is significantly decreased among females than males which might be due to the reason that all the recordings in the female were recorded during the menstrual phase where all the female sex hormones are in the basal level. Certain cognitive parameters were significantly increased in females with less stress and some in males with more stress; thus, stress has a varied effect on cognition in males and females.

Effects Of Wrist Cooling On Balance And Cognitive Performance In The Heat

Many cooling modalities exist in the literature claiming to improve performance in the heat; however, there’s a paucity of literature regarding wrist cooling’s effects on balance and cognitive performance after a bout of exercise in the heat. PURPOSE: To examine if wrist cooling influences balance and cognitive performance after a bout of cycling exercise in the heat. METHODS: Fourteen male participants (age, 22±4 years; height, 182±7 cm; body mass, 75.4±8.7 kg; body fat %, 10.7±3.4%) were analyzed. In an environmental heat chamber (39.5±0.9°C, 38.6±5.2% RH) participants underwent three randomized 135-minute cycling trials, which included: one wrist cooling device (W1), two wrist cooling devices (W2), and no wrist cooling device (W0) during exercise. Cognitive measures (Balance Error Scoring System [BESS], Letter Digit Substitution Test [LDST], Trail Making Test [TM]) were conducted immediately post-exercise, and delta scores were calculated from a baseline familiarization session. Rectal temperature (TREC) was taken every 15 minutes during exercise. A group x time repeated measures ANOVA was conducted to determine group differences, and paired samples t-tests were used to determine mean differences. RESULTS: No statistical difference between groups W1 and W2 occurred, therefore their data were pooled (WP). No statistically significant difference was observed in TREC between W0 and WP (n=28; p=0.69). Additionally, no significant differences were observed in the LDST (n=27, p=0.21) and TM (n=26, p=0.64) delta scores between W0 and WP. Significant differences were noted in BESS delta scores between W0 and WP, specifically for the single leg foam stance (0±2 vs. 1±2, respectively; p=0.002). CONCLUSION: Wrist cooling during exercise in the heat did not have an effect on TREC, LDST, and TM scores; however, it did significantly improve single leg foam stance of the BESS testing post-exercise. Further research is warranted to investigate the potential link of body cooling and balance performance, as well as the effectiveness of wrist cooling on cognitive measures after exercising in the heat.

Information processing speed in multiple sclerosis: Relevance of default mode network dynamics.

ObjectiveTo explore the added value of dynamic functional connectivity (dFC) of the default mode network (DMN) during resting-state (RS), during an information processing speed (IPS) task, and the within-subject difference between these conditions, on top of conventional brain measures in explaining IPS in people with multiple sclerosis (pwMS).MethodsIn 29 pwMS and 18 healthy controls, IPS was assessed with the Letter Digit Substitution Test and Stroop Card I and combined into an IPS-composite score. White matter (WM), grey matter (GM) and lesion volume were measured using 3 T MRI. WM integrity was assessed with diffusion tensor imaging. During RS and task-state fMRI (i.e. symbol digit modalities task, IPS), stationary functional connectivity (sFC; average connectivity over the entire time series) and dFC (variation in connectivity using a sliding window approach) of the DMN was calculated, as well as the difference between both conditions (i.e. task-state minus RS; ΔsFC-DMN and ΔdFC-DMN). Regression analysis was performed to determine the most important predictors for IPS.ResultsCompared to controls, pwMS performed worse on IPS-composite (p = 0.022), had lower GM volume (p < 0.05) and WM integrity (p < 0.001), but no alterations in sFC and dFC at the group level. In pwMS, 52% of variance in IPS-composite could be predicted by cortical volume (β = 0.49, p = 0.01) and ΔdFC-DMN (β = 0.52, p < 0.01). After adding dFC of the DMN to the model, the explained variance in IPS increased with 26% (p < 0.01).ConclusionOn top of conventional brain measures, dFC from RS to task-state explains additional variance in IPS. This highlights the potential importance of the DMN to adapt upon cognitive demands to maintain intact IPS in pwMS.

Prolonged Grief and Cognitive Decline: A Prospective Population-Based Study in Middle-Aged and Older Persons

Bereavement can result in unresolved and prolonged grief, often termed prolonged grief disorder (PGD). The impact of PGD on cognitive functioning is poorly understood. The aim of the study was to compare the cognitive decline, assessed by repeated measures of different cognition domains, between persons with normal and PGD and a non-grieving reference population in a 7-year follow-up study. The study sample comprised 3126 non-demented persons, mean age: 64 years, of the Rotterdam Study. Participants were classified into three groups: no grief (reference group, N = 2,582), normal grief (N = 418), and prolonged grief disorder (N = 126). Participants were assessed with the Complicated Grief Inventory and underwent cognitive testing (Mini-Mental State Examination [MMSE], Letter-Digit Substitution test, Stroop test, Word fluency task, Word learning test). Analyses were adjusted for baseline cognition and depressive symptoms; persons with major depressive disorders were excluded. Compared with the reference group, participants with PGD showed a decrease in global cognitive function, MMSE scores, and World learning test (immediate and delayed) over time. Participants with normal grief did not show a stronger cognitive decline in any of cognitive tests than the reference group. Participants with PGD showed a stronger cognitive decline than the reference group during 7 years of follow-up. This suggests that PGD is a risk factor for cognitive decline, but this study cannot detect the psychobiological mechanism underlying this longitudinal association.

Are non-demented patients with Parkinson's disease able to decide about their own treatment?

IntroductionPatients with Parkinson's disease (PD) are often confronted with difficult medical decisions, which might be hampered by cognitive impairment or chronic stress. Little is known, however, about the capacity to make medical decisions and the influence of cognition and stress on this ability. This study determined whether non-demented Parkinson's disease patients are able to make medical decisions and whether this capacity is influenced by cognition and stress. MethodsForty-six Parkinson's disease patients and 94 healthy controls were assessed with the MacArthur Competence Assessment Tool for Treatment during which participants were presented with deep brain stimulation as a treatment option for a fictional Parkinson's disease patient. Furthermore, all participants were examined with a stress questionnaire and a neuropsychological test battery. ResultsParkinson's disease patients performed better on the total scale and ‘Understanding’ subscale of the MacArthur Competence Assessment Tool for Treatment than healthy controls. Lower performance on the Concept Shifting Test in the Parkinson's disease group and lower performance on Letter Digit Substitution Test in the healthy control group predicted lower medical decision-making capacity. No association was found between stress and medical decision-making. ConclusionNon-demented Parkinson's disease patients show no impairments in medical decision-making compared to healthy controls. In fact, Parkinson's disease patients have a better understanding of their disease and the benefits and risks of treatment options than healthy controls. Psychomotor speed and attention were negatively associated with medical decision-making in both groups. This implies that when these cognitive functions decline, the capacity to make medical decisions also declines.

Effects of Age and Working Memory Capacity on Speech Recognition Performance in Noise Among Listeners With Normal Hearing.

This study aimed to determine if younger and older listeners with normal hearing who differ on working memory span perform differently on speech recognition tests in noise. Older adults typically exhibit poorer speech recognition scores in noise than younger adults, which is attributed primarily to poorer hearing sensitivity and more limited working memory capacity in older than younger adults. Previous studies typically tested older listeners with poorer hearing sensitivity and shorter working memory spans than younger listeners, making it difficult to discern the importance of working memory capacity on speech recognition. This investigation controlled for hearing sensitivity and compared speech recognition performance in noise by younger and older listeners who were subdivided into high and low working memory groups. Performance patterns were compared for different speech materials to assess whether or not the effect of working memory capacity varies with the demands of the specific speech test. The authors hypothesized that (1) normal-hearing listeners with low working memory span would exhibit poorer speech recognition performance in noise than those with high working memory span; (2) older listeners with normal hearing would show poorer speech recognition scores than younger listeners with normal hearing, when the two age groups were matched for working memory span; and (3) an interaction between age and working memory would be observed for speech materials that provide contextual cues. Twenty-eight older (61 to 75 years) and 25 younger (18 to 25 years) normal-hearing listeners were assigned to groups based on age and working memory status. Northwestern University Auditory Test No. 6 words and Institute of Electrical and Electronics Engineers sentences were presented in noise using an adaptive procedure to measure the signal-to-noise ratio corresponding to 50% correct performance. Cognitive ability was evaluated with two tests of working memory (Listening Span Test and Reading Span Test) and two tests of processing speed (Paced Auditory Serial Addition Test and The Letter Digit Substitution Test). Significant effects of age and working memory capacity were observed on the speech recognition measures in noise, but these effects were mediated somewhat by the speech signal. Specifically, main effects of age and working memory were revealed for both words and sentences, but the interaction between the two was significant for sentences only. For these materials, effects of age were observed for listeners in the low working memory groups only. Although all cognitive measures were significantly correlated with speech recognition in noise, working memory span was the most important variable accounting for speech recognition performance. The results indicate that older adults with high working memory capacity are able to capitalize on contextual cues and perform as well as young listeners with high working memory capacity for sentence recognition. The data also suggest that listeners with normal hearing and low working memory capacity are less able to adapt to distortion of speech signals caused by background noise, which requires the allocation of more processing resources to earlier processing stages. These results indicate that both younger and older adults with low working memory capacity and normal hearing are at a disadvantage for recognizing speech in noise.

Physical Activity in the School Setting: Cognitive Performance Is Not Affected by Three Different Types of Acute Exercise

Recent studies indicate that a single bout of physical exercise can have immediate positive effects on cognitive performance of children and adolescents. However, the type of exercise that affects cognitive performance the most in young adolescents is not fully understood. Therefore, this controlled study examined the acute effects of three types of 12-min classroom-based exercise sessions on information processing speed and selective attention. The three conditions consisted of aerobic, coordination, and strength exercises, respectively. In particular, this study focused on the feasibility and efficiency of introducing short bouts of exercise in the classroom. One hundred and ninety five students (5th and 6th grade; 10–13 years old) participated in a double baseline within-subjects design, with students acting as their own control. Exercise type was randomly assigned to each class and acted as between-subject factor. Before and immediately after both the control and the exercise session, students performed two cognitive tests that measured information processing speed (Letter Digit Substitution Test) and selective attention (d2 Test of Attention). The results revealed that exercising at low to moderate intensity does not have an effect on the cognitive parameters tested in young adolescents. Furthermore, there were no differential effects of exercise type. The results of this study are discussed in terms of the caution which should be taken when conducting exercise sessions in a classroom setting aimed at improving cognitive performance.