P300 Latency Research Articles

Age-related Electrophysical Correlates of Cross-modal Attention Switching.

The human experience demands seamless attentional switches between sensory modalities. Aging raises questions about how declines in auditory and visual processing affect cross-modal attention switching. This study used a cued cross-modal attention-switching paradigm where visual and auditory stimuli were simultaneously presented on either spatially congruent or incongruent sides. A modality cue indicated the target modality, requiring a spatially left versus right key-press response. EEG recordings were collected during task performance. We investigated whether the mixing costs (decreased performance for repetition trials in a mixed task compared with a single task) and switch costs (decreased performance for a switch of target modality compared with a repetition) in cross-modal attention-switching paradigms would exhibit similarities in terms of behavioral performance and the ERP components to those observed in the traditional unimodal attention-switching paradigms. Specifically, we focused on the ERP components: cue-locked P3 (mixing/switch-related increased positivity), target-locked P3 (mixing/switch-related decreased positivity), and target-locked lateralized readiness potential (mixing/switch-related longer latency). In addition, we assessed how aging impacts cross-modal attention-switching performance. Results revealed that older adults exhibited more pronounced mixing and switch costs than younger adults, especially when visual and auditory stimuli were presented on incongruent sides. ERP findings showed increased cue-locked P3 amplitude, prolonged cue-locked P3 latency, decreased target-locked P3 amplitude, prolonged target-locked P3 latency in association with switch costs, and prolonged onset latency of the target-locked lateralized readiness potential in association with the mixing costs. Age-related effects were significant only for cue-locked P3 amplitude, cue-locked P3 latency (switch-related), and target-locked P3 latency (switch-related). These findings suggest that the larger mixing costs and switch costs in older adults were because of the inefficient use of modality cues to update a representation of the relevant task sets and required more processing time for evaluating and categorizing the target.

Mixed martial arts athletes demonstrate different brain vital sign profiles compared to matched controls at baseline.

We investigated objective brain vital signs derived from event-related potentials (ERPs) for mixed martial arts (MMA) athletes and matched controls (N = 24). Brain vital sign scans were acquired from 9 MMA athletes and 15 age-and sex-matched controls. Our analysis specifically compared differences in brain vital signs between MMA athletes and controls at baseline. We predicted that MMA athletes would show significant differences relative to controls due to their ongoing exposure to repetitive head impacts. Participants were scanned to extract three well-established ERPs: N100 for auditory sensation; P300 for basic attention; and N400 for cognitive processing. Scans were verified using automated reports, with N100, P300, and N400 amplitudes and latencies manually identified by a blinded reviewer. Brain vital signs were compared across groups with a Kruskal-Wallis H-test for independent samples, with FDR correction for multiple comparisons. We identified significant differences between MMA athletes and controls. Specifically, there were significant N400 amplitude reductions, indicating that exposure to repetitive head impacts in MMA may be associated with changes in brain function.

Impact of yoga-based interventions on cognitive and autonomic functions in major depressive disorder population.

Cognitive and autonomic dysfunction is increasingly being recognized as an important clinical dimension in major depressive disorder. The aim of this study is to evaluate the effect of a combined approach of yoga and diet intervention on cognitive and autonomic functions in individuals with major depressive disorders. This experimental observational study was conducted at RUHS College of Medical Sciences and Associated Hospitals, Jaipur, on the major depressive disorder population of either sex cognitive function (mini-mental score, Montreal cognitive protocol A and B, P300 latency and amplitude) and autonomic function parameters (frequency and time domain) were recorded at baseline and after three months of a combined approach of yoga and diet intervention. This study compared cognitive and autonomic function parameters at baseline and after three months of yoga and diet intervention in a major depressive disorder population. Analysis revealed a significant decrease in body mass index (<0.05), systolic blood pressure (<0.001), Hamilton rating scale for depression (<0.001), P300 latency (<0.001), standard deviation of NN interval (SDNN) (<0.001), and mean heart rate (<0.001), whereas there was a significant increase in mini-mental score (<0.001), Montreal cognitive protocol A and B (<0.001), high frequency (HF) (<0.001), root mean square standard deviation (RMSSD) (<0.001), and PNN50 (<0.001) after a combined approach of yoga and diet in the study group as compared to control group participants. Yoga and diet combined may be an effective adjunct therapy for improving brain health and mental performance, lowering the risk of depression by affecting the neurotransmitter system and raising vagal tone which contributes to learning and memory.

Comparison of Air Conduction and Bone Conduction Masseter Vestibular Evoked Myogenic Potential Between Neurotypical Young Adults and Individuals With Conductive Hearing Loss.

Introduction Masseter vestibular evoked myogenic potential (mVEMP) is an acoustically evoked potential recorded from the masseter muscle. It is a recent tool in the vestibular assessment battery that checks the integrity of the vestibulomasseteric reflex pathway, specifically for saccular function. Need of the study There is a small pool of subjects with cervical spondylitis and anomalies in the eye muscle where cervical vestibular evoked myogenic potential (cVEMP) and ocular vestibular evoked myogenic potential (oVEMP) tests cannot be performed. In such conditions, mVEMP is considered an appropriate tool to assess the vestibular function. Bone conduction (BC) mVEMP assesses vestibular function in individuals with conductive hearing loss having a significant air-bone gap (ABG). Hence, it is essential to establish a comparative normal range of values for air conduction (AC) and BC mVEMP. Aim of the study The study aimed to evaluate the vestibulomasseteric reflex pathway using AC and BC mVEMP for click and 500 Hz tone burst stimuli in neurotypical young adults and compare it to individuals with conductive hearing loss. Method Ten neurotypical (20 ears) young adults and five (10 ears) individuals with conductive hearing loss in the age range of 15-40 years without vestibular complaints were recruited for the study. The AC and BC mVEMP were recorded monaurally using click and 500 Hz tone burst stimuli for all the participants. Results For neurotypical young adults, the mean latencies of P1 and N1 for AC and BC mVEMP using click were 13.87±1.86 ms and 19.78±2.14 ms and 13.79±2.06 ms and 21.30±1.48 ms, respectively. The P1 and N1 mean latencies for AC and BC mVEMP using 500 Hz tone burst were 14.90±1.50 ms and 21.03±1.30 ms and 14.18±0.95 ms and 19.75±1.71 ms, respectively. For individuals with conductive hearing loss, the P1 and N1 mean latencies for AC and BC mVEMP using click were 15.37±1.46 ms and 20.65±2.65 ms and 15.41±0.68 ms and 21.07±1.45 ms, respectively. AC mVEMP responses were absent for 500 Hz tone burst stimuli. The P1 and N1 mean latencies for BC mVEMP using 500 Hz tone burst stimuli were 14.96±0.6 ms and 22.72±1.42 ms, respectively. Conclusion AC mVEMP was absent for 500 Hz tone burst stimulus but present for click stimulus in individuals with conductive hearing loss as there was a larger ABG at the low frequencies than at the mid-high frequencies. BC mVEMP was present for click and 500 Hz tone burststimuli in all individuals with conductive hearing loss and latencies of P1 and N1 were similar to results obtained for neurotypical young adults and no significant difference was seen.

Balance Impairment in Patients with Rheumatoid Arthritis and Ankylosing Spondylitis.

Balance weaknesses related to mobility and fall risk in patients with rheumatic diseases are well-known. Vestibular dysfunction could negatively contribute to the balance ability of this patient population. This study aims to investigate the effects of Rheumatoid Arthritis (RA) and Ankylosing Spondylitis (AS), among the most common rheumatic diseases, on postural balance related to vestibular function. Seventy-eight participants were grouped as RA (n=34, 43%), AS (n=24, 30.7%), and the control group consisted of healthy individuals (n=20, 25.6%). Cervical Vestibular Evoked Myogenic Potentials (cVEMP) test, which assesses the vestibular function objectively, Dizziness Handicap Inventory (DHI), which evaluates vertigo subjectively, and Berg Balance Scale (BBS) were performed. Different degrees of VEMP latency prolongations were found in the AS and RA groups. Right, and left ear N1 latencies were significantly longer in the AS group than in RA and control. Right ear P1 latency prolongation was statistically significant in the RA group. Amplitude asymmetry ratio (AAR) was found to be considerably higher in the RA and AS groups than in the control group (p<0.05). The mean BBS score in the AS group was below the fall risk score of 45. A negative statistically significant effect was observed between latency prolongation and BBS in AS groups. The abnormal VEMP findings in individuals with RA and AS shows inner ear vestibular system dysfunction. This vestibular impairment strictly contributes to their postural imbalance and requires a focused vestibular rehabilitation program for balance treatment.

Physical exercise on cortical brain activity in patients with mild cognitive impairment: A meta-analysis.

Physical exercise is recognized as a potential strategy to mitigate the cognitive decline associated with mild cognitive impairment (MCI). This systematic review aims to examine the specific effects of physical exercise on cortical brain activity in patients with MCI, an area that has not been thoroughly explored. We conducted a search across 9 electronic databases for randomized controlled trials assessing the impact of physical exercise on the cortical activity of patients with MCI. The search covered the period from database inception to September 2023. Literature screening, data extraction, and quality assessments were carried out by 2 independent researchers. Meta-analyses were conducted using RevMan 5.3, and publication bias was evaluated using STATA 17.0. This study primarily assessed P300 latency and amplitude, alongside cognitive evaluations using the mini-mental state examination and Montreal Cognitive Assessment. Six high-quality randomized controlled trials, involving a total of 360 participants, were included. Compared to the control group, significant enhancements were observed in the amplitude of central midline electrode (mean difference [MD] = 1.64 [95% confidence interval [CI], 0.92-2.36]; P < .00001), frontal midline electrode (MD = 2.70 [95% CI, 2.02-3.38]; P < .00001), and parietal midline electrode (MD = 2.42 [95% CI, 0.44-4.41]; P = .02). Latency periods of the central midline electrode (MD = -32.40 [95% CI, -40.27 to -24.54]; P < .00001), frontal midline electrode (MD = -12.57 [95% CI, -30.83 to 5.69]; P = .18), and parietal midline electrode (MD = -12.57 [95% CI, -30.83 to 5.69]; P = .81) were also notably influenced. Moreover, overarching cognitive functions as measured by mini-mental state examination (MD = 1.02 [95% CI, 0.61-1.43]; P < .00001) and Montreal Cognitive Assessment (MD = 1.39 [95% CI, 0.67-2.12]; P = .0002) exhibited marked improvement. This meta-analysis suggests that physical exercise can augment the P300 amplitude, reduce the P300 latency period, and, overall, enhance cognitive functionality in individuals with MCI.

Effect of Repetitive Transcranial Magnetic Stimulation on Post-Stroke Comorbid Cognitive Impairment and Depression: A Randomized Controlled Trial.

There are currently no uniform treatments for post-stroke comorbid cognitive impairment and depression (PSCCID). To verify whether repetitive transcranial magnetic stimulation (rTMS) can improve PSCCID symptoms and explore the underlying roles of resting-state functional magnetic resonance imaging (rs-fMRI). Thirty PSCCID patients were randomized in a 1 : 1 ratio to receive 4 weeks of rTMS (intervention group) or sham rTMS (control group) over the left dorsolateral prefrontal cortex (DLPFC). rs-fMRI was acquired to analyze the functional plasticity of brain regions at baseline and immediately after the last intervention. Cognition, depression status, and neural electrophysiology were improved in both intervention and control groups after treatment (p = 0.015-0.042), and the intervention group had more significant improvement than the control group. Analysis of functional connectivities (FCs) within the default mood network (DMN) showed that the connection strength of the left temporal pole/left parahippocampal cortex and right lateral temporal cortex/right retrosplenial cortex in the intervention group were enhanced compared with its pre-intervention and that in the control group after treatment (p < 0.05), and the both FC values were positively correlated with MMSE scores (p < 0.001). The intervention group had stronger FCs within the DMN compared with the control group after treatment, and some of the enhanced FCs were correlated with the P300 latency and amplitude. rTMS over the left DLPFC is an effective treatment for improving both cognitive impairment and depression among patients with PSCCID. The enhanced FCs within the DMN may serve as a compensatory functional recombination to promote clinical recovery.

Study of Visual Evoked Potentials in Schoolchildren: A Promising Aid to Pediatric Ophthalmology.

Background Visual evoked potential (VEP) is a noninvasive investigation conducted to identify abnormalities in the visual system. It is especially suitable for young children who are unable to express visual symptoms or participate in conventional vision tests. This study was undertaken to examine the VEP among schoolchildren to assess the functionality of their optic pathway. Methodology This short-term observational study was performed in the Clinical Neurophysiology Unit of the Physiology Department of a rural medical college. The study population consisted of 60 schoolchildren aged 7-12. Both eyes were examined for transient pattern reversal VEP recordingsusing a Recorders & Medicare Systems Electromyography-Evoked Potential recorder (RMS EMG-EP MARK-II Pvt. Ltd., Chandigarh, India). Results VEPs were analyzed for latency and amplitude of the main components, namely P100, N70, and N155. The results showedmarkedly extended P100 latency in33.33%, i.e., eight outof 24 eyes of standard (std.) III children. Similar latency prolongation was obtained in 36.36% (eight out of 22)eyes of std. IV, 30% (six of 20 eyes) of std. V, 13.63% (three of 22 eyes) of std. VI, and 50% (eight of 16 eyes) in std. VII and VIIIchildren. A markedly reduced P100 amplitude was observedin two of 20 eyes (10%) of std. V, two of 16 eyes (12.5%) in std. VII and VIIIchildren, amounting to a P100amplitude abnormality in5%eyesin toto. The interocular differences in all VEP parameters amongthe subjects were statistically insignificant. Conclusion In schoolchildren in whom normal latencies and amplitudes were obtained, the presence of reproducible VEPs indicated the normal functionalstatus of their visual pathway. On the other hand,in those children where alteredVEP findings were found, it hinted towardcomplementary informationthat they may have underlying ocular disordersthat were yet to be diagnosed. Hence, this study provides insight into the assessment of visual system function, which is primarily difficult in young children.

Transcranial Direct Current Stimulation in Children With Anisometropic Amblyopia.

Amblyopia is defined clinically as a difference in best-corrected visual acuity of two or more lines of acuity (0.2 logMAR) between the eyes. Transcranial direct current stimulation (tDCS) is a noninvasive brain stimulation technique that can transiently alter the excitability of targeted brain areas in a polarity-specific manner. To detect the effect of tDCS on anisometropic amblyopia. This is a randomized controlled trial conducted on 78 patients with anisometropic amblyopia from 4.5 to 12 years of age. All patients presented with monocular amblyopia. They were divided into three groups; each group received five sessions of tDCS (anodal tDCS, cathodal tDCS, and sham tDCS). The active electrode was placed over occipital midline and the reference over central midline. Pattern visual-evoked potentials and contrast sensitivity tests were conducted before, immediately after, and 1 week after tDCS. The amplitude of P100 was significantly decreased immediately after and 1 week after cathodal tDCS. The latency of P100 immediately after and 1 week after anodal tDCS was significantly decreased and increased significantly after cathodal tDCS. The amplitude of P100 and maximum and minimum contrast sensitivities were significantly increased immediately after and 1 week after anodal tDCS, and maximum contrast sensitivity was significantly decreased immediately after cathodal tDCS. Anodal tDCS is a promising noninvasive modality for improvement of anisometropic amblyopia.

RXR agonist, 9-cis-13,14-dihydroretinoic acid (9CDHRA), reduces damage and protects from demyelination in transsynaptic degeneration model

Neurodegenerative and demyelinating disease, such as multiple sclerosis (MS) are at the forefront of medical research and the discovery of new drugs and therapeutics. One phenomenon of degeneration seen in these diseases is transsynaptic degeneration (TSD), where damage from one axon spreads to the other axons that are connected to it synaptically. It has previously been found that demyelination occurs prior to neuronal loss in an experimental form of induced TSD. Retinoid-x receptor (RXR) agonists have been shown to promote remyelination. Therefore, this study aimed to reveal the effects of a novel endogenous RXR-γ agonist, 9-cis-13,14-dihydroretinoic acid (9CDHRA), on preventing or restoring the effects of TSD. 9CDHRA was administered to mice following optic nerve crush (ONC) procedures, and electrophysiology (visual evoked potential, VEP) and histological (immunofluorescent) assessments were performed. It was found that 9CDHRA treatment effectively delayed glial activation and reduced the presence of apoptosis at the site of injury and further anterogradely in the visual system, including the lateral geniculate nucleus (LGN) and primary visual cortex (V1). Most notably, 9CDHRA was able to maintain myelin levels following ONC, and effectively protected from demyelination. This was corroborated by VEP recordings with improved P1 latency. The promising findings regarding the injury attenuating and myelin protecting properties of 9CDHRA necessitates further investigations into the potential therapeutic uses of this compound.

The impact of smartphone deprivation on attentional bias in problematic smartphone users: Evidence from behavioral and physiological perspectives

This study innovatively applied smartphone deprivation and aimed to assess its behavioral and physiological effects in problematic smartphone users. In Experiment 1, 283 participants completed an investigation related to smartphone use, including 92 participants identified as problematic smartphone users. Based on an average smartphone unlocking interval of 19.67 min, the duration of smartphone deprivation was set to 20 min. After deprivation, the participants exhibited a significant increase in smartphone cravings and a decrease in heart rate. Experiment 2 applied a modified cueing task to explore problematic smartphone users’ attentional bias, in which smartphone-related and neutral pictures were selected as the materials. There were 22 and 23 participants in the smartphone-deprivation and control groups, respectively. In the deprivation group, reaction times (RTs) for smartphone-related pictures were longer than for neutral pictures. In Experiment 3, we incorporated electroencephalography technology to also assess a smartphone turned-off group. There were 16, 21, and 14 participants in smartphone deprivation, smartphone turned-off, and control groups, respectively. In both the smartphone deprivation and smartphone turned-off groups, participants had longer RTs on smartphone-related pictures than on neutral pictures. Furthermore, for participants in the deprivation group, N2 latencies in relation to smartphone-related pictures were earlier than those in relation to neutral pictures, while participants in the turned-off group had larger P3 amplitudes and earlier P3 latencies for invalid cues compared with valid cues.

Effects of daily listening to 6 Hz binaural beats over one month: an event-related potentials study

The aim of the present study was to identify cognitive alterations, as indicated by event-related potentials (ERPs), after one month of daily exposure to theta binaural beats (BBs) for 10 minutes. The recruited healthy subjects (n = 60) were equally divided into experimental and control groups. For a month, the experimental group was required to practice BBs listening daily, while the control group did not. ERPs were assessed at three separate visits over a span of one month, with a two-week interval between each visit. At each visit, ERPs were measured before and after listening. The auditory and visual ERPs significantly increased the auditory and visual P300 amplitudes consistently at each visit. BBs enhanced the auditory N200 amplitude consistently across all visits, but the visual N200 amplitude increased only at the second and third visits. Compared to the healthy controls, daily exposure to BBs for two weeks resulted in increased auditory P300 amplitude. Additionally, four weeks of BBs exposure not only increased auditory P300 amplitude but also reduced P300 latency. These preliminary findings suggest that listening to BBs at 6 Hz for 10 minutes daily may enhance certain aspects of cognitive function. However, further research is needed to confirm these effects and to understand the underlying mechanisms. Identifying the optimal duration and practice of listening to 6 Hz BBs could potentially contribute to cognitive enhancement strategies in healthy individuals.

Bone conducted cervical vestibular evoked myogenic potentials: comparison of tone burst stimulus vs chirp stimulus.

Vestibular evoked myogenic potential (VEMP) is a test used to evaluate the function of otolith organs. In healthy individuals, air-conducted (AC) responses are obtained, whereas, in conductive hearing loss, the inability to transmit the signal well enough with AC stimuli has led to the need for bone-conducted (BC) stimuli. This study aimed to compare 500Hz Chirp and Tone Burst stimuli in terms of latency and amplitude in BC cVEMP. This prospective observational case control study included 35 healthy participants (70 ears) between the age of 20-50. Participants underwent VEMP testing with BC 500Hz Tone Burst stimulus and 500Hz narrow band Chirp stimulus without changing the position of the bone conducted vibrator. The intensity of the stimuli was 50 dB nHL. Response rate of 500Hz TB Stimulus was 51.4% and 95.7% in Chirp stimulus. It was observed that significantly more responses were obtained with Chirp stimulus than TB stimulus (p < 0.001). In terms of p1 latency, n1 latency, both latencies were significantly shorter in Chirp stimulus (p < 0.001). p1n1 amplitude was found significantly larger in Chirp stimulus (p < 0.001). Compared to 500Hz TB stimulus, 500Hz Chirp stimulus results in a higher response rate, larger p1n1 amplitude, and shorter p1 and n1 latency. A higher response rate may provide a more accurate assessment of otolith organs, reducing false negatives due to signal transmission in patients.

Reduced spatial frequency differentiation and sex-related specificities in fearful face detection in autism: Insights from EEG and the predictive brain model.

Face processing relies on predictive processes driven by low spatial frequencies (LSF) that convey coarse information prior to fine information conveyed by high spatial frequencies. However, autistic individuals might have atypical predictive processes, contributing to facial processing difficulties. This may be more normalized in autistic females, who often exhibit better socio-communicational abilities than males. We hypothesized that autistic females would display a more typical coarse-to-fine processing for socio-emotional stimuli compared to autistic males. To test this hypothesis, we asked adult participants (44 autistic, 51 non-autistic) to detect fearful faces among neutral faces, filtered in two orders: from coarse-to-fine (CtF) and from fine-to-coarse (FtC). Results show lower d' values and longer reaction times for fearful detection in autism compared to non-autistic (NA) individuals, regardless of the filtering order. Both groups presented shorter P100 latency after CtF compared to FtC, and larger amplitude for N170 after FtC compared to CtF. However, autistic participants presented a reduced difference in source activity between CtF and FtC in the fusiform. There was also a more spatially spread activation pattern in autistic females compared to NA females. Finally, females had faster P100 and N170 latencies, as well as larger occipital activation for FtC sequences than males, irrespective of the group. Overall, the results do not suggest impaired predictive processes from LSF in autism despite behavioral differences in fear detection. However, they do indicate reduced brain modulation by spatial frequency in autism. In addition, the findings highlight sex differences that warrant consideration in understanding autistic females.

Cognitive assessment in multiple sclerosis patients: electrophysiological and subjective studies

BackgroundMultiple sclerosis (MS) is a persistent inflammatory condition affecting the central nervous system, often associated with cognitive impairment. This impairment frequently presents itself as deficiencies in short-term memory, attention, and information processing speed. This research was designed to investigate P300 in patients with MS and its correlation with their cognitive function and their state of fatigue and depression. This work included two groups: the control group (20 subjects) and the study group (30 MS patients). Evaluation encompassed clinical history, audiological assessment, the Expanded Disability Status Scale (EDSS), the fatigue severity scale, the Beck Depression Inventory, Addenbrooke’s cognitive examination, and P300 component of event-related potentials (ERPs).ResultsThe study group exhibited varying degrees of fatigue and depression. The scores of Addenbrooke’s cognitive evaluation were reduced in the MS group. The MS group exhibited a considerably prolonged P300 latency compared to the control group.ConclusionThis study demonstrates the effectiveness of P300 in assessing cognitive function in persons diagnosed with MS.

Analysis of visual evoked potentials in patients with neurofibromatosis type 1: new concepts.

Neurofibromatosis type 1 (NF type 1) is an autosomal dominant disease with typical clinical manifestations, such as skin lesions, Lisch nodules, optic pathway gliomas, and neurofibromas, caused by the mutation of the NF1 gene. Visual evoked potentials (VEP) present a measure of the electrophysiological response of visual cortex to a visual stimulus. The role of VEP in the pathophysiology of NF type 1 is very complex and requires additional research. We examined the differences between NF type 1 patients with normal and altered VEP and analyzed the correlation between the prolongation of P100 latency and disease severity. Two groups were formed: a control group and a study group with NF type 1 patients. Based on the control group analysis, a threshold value for a normal VEP finding of 116 ms was obtained, and it was used to divide the study group into subgroups with normal and altered VEP. We proceeded with examining the differences in clinical manifestations of the disease between the subgroups, after which we checked if there is a correlation between the prolongation of the P100 latency and the severity of the clinical picture according to the Riccardi scale. Statistical analysis was performed using the Pearson chi-square test and the Spearman correlation test in the program SPSS 28.0, with levels of statistical significance p = 0.05 and p = 0.001. In the group with the abnormal VEP we found a statistically significant more frequent occurrence of optic tract glioma (p = 0.008), tumors (p = 0.032), epilepsy (p = 0.043), and cognitive disorders (p = 0.028), while the other clinical signs had an equal prevalence in both groups. A moderately strong correlation (r s = 0.665) was observed between the prolongation of P100 latency and the severity of the clinical picture. Our results showed the important role of VEP in the description of clinical phenotypes of NF type 1. The authors of the study propose VEP to be included in the diagnostic algorithms designed for patients with NF type 1.

Impact of early refined nursing program on prognosis of middle-aged and elderly patients with cognitive dysfunction combined with cerebral infarction.

Cerebral infarction is a local or extensive necrosis of brain tissue. Subsequently, the corresponding neurological deficits appear. The incidence of cerebrovascular diseases in China is increasing gradually. After the onset of cerebrovascular disease, the most common sequelae include movement disorders, language disorders, and cognitive dysfunction. To investigate the effect of early refined nursing program on the prognosis of middle-aged and elderly patients with cerebral infarction combined with cognitive dysfunction. A retrospective study was conducted to divide 60 patients with cerebral infarction and cognitive impairment into an experimental group (n = 32) and a control group (n = 28). The experimental group received early intensive care every day, and the control group received daily routine care. The scores of the Mini-Mental State Examination (MMSE) and the Trail Making Test (TMT), as well as the latency and amplitude of the event-related potential P300, were used as main indicators to evaluate changes in cognitive function, and changes in BDNF, TGF-β, and GDNF expression were used as secondary indicators. Both groups experienced notable enhancements in MMSE scores, with the experimental group demonstrating higher scores than the control group (experimental: 28.75 ± 2.31; control: 25.84 ± 2.87). Moreover, reductions in TMT-A and TMT-B scores were observed in both groups (experimental: TMT-A 52.36 ± 6.18, TMT-B 98.47 ± 10.23; control: TMT-A 61.48 ± 7.92, TMT-B 112.63 ± 12.55), with the experimental group displaying lower scores. P300 Latency decreased (experimental: 270.63 ms ± 14.28 ms; control: 285.72 ms ± 16.45 ms), while amplitude increased (experimental: 7.82 μV ± 1.05 μV; control: 6.35 μV ± 0.98 μV) significantly in both groups, with superior outcomes in the experimental cohort. Additionally, the levels of the growth factors BDNF, TGF-β1, and GDNF surged (experimental: BDNF 48.37 ng/mL ± 5.62 ng/mL, TGF-β1 52.14 pg/mL ± 4.28 pg/mL, GDNF 34.76 ng/mL ± 3.89 ng/mL; control: BDNF 42.58 ng/mL ± 4.73 ng/mL, TGF-β1 46.23 pg/mL ± 3.94 pg/mL, GDNF 30.25 ng/mL ± 2.98 ng/mL) in both groups, with higher levels in the experimental group. For middle-aged and elderly patients with cerebral infarction and cognitive dysfunction, early refined nursing can significantly improve their cognitive function and prognosis.

Sensory processing patterns among children with autism spectrum disorder (ASD) and attention deficit hyperactivity disorder (ADHD) using short sensory profile and evoked potentials: a case–control study

BackgroundBoth autism spectrum disorder (ASD) and attention-deficit hyperactivity disorder (ADHD) are early neurodevelopmental disorders that present notable diagnostic problems and share clinical features. The current research intends to clarify the sensory profile, visual-evoked potential (VEP), and auditory-evoked potential of children diagnosed with autism spectrum disorder (ASD), ADHD, and typically developing children (TD). We have observed sensory processing problems in 42–88% of children diagnosed with autism and approximately 50% of children diagnosed with ADHD.ResultsThe parents of 37 children diagnosed with ASD, 41 children diagnosed with ADHD, and 43 children who were typically developing completed the short sensory profile (SSP) along with standardized questionnaires used to assess the symptoms and autistic behaviors. We assessed intellectual functioning and evoked potential in all the groups. There were more sensory problems in the ASD and ADHD groups than in the control group (P < 0.001); however, autism and ADHD differed in all subscales except unresponsiveness, auditory filtering, and visual/auditory subscales. Also, the ASD group and ADHD group showed a more significant delay in visual-evoked potential VEP than the control group (mean and SD of right eye p100 latency 150.85 ± 48.70 in ASD vs 119.28 ± 18.06 in ADHD vs 103.42 ± 5.19 in typically developing group, left p100 latency 141.09 in ASD ± 32.55 vs 116.51 ± 10.1 in ADHD vs 103.0 ± 5.91 typically developing group). Additionally, the ASD group significantly deviated from norms in the absolute latency of waves I, III, and V, as well as the inter-wave intervals of I–III and III–V in the auditory-evoked potential. Furthermore, there was a statistically significant distinction between the ADHD and the TD groups in terms of left wave III and V latency and left interpeak latency between I–III and III–V.ConclusionChildren diagnosed with ASD and ADHD have a greater likelihood than typically developing children to experience sensory processing abnormalities; as a result, we recommend basic assessment, follow-up, and designing the most appropriate intervention.

Acupuncture combined with repeated transcranial magnetic stimulation for mild to moderate post-stroke depression: a randomized controlled trial

To explore the clinical effect of acupuncture combined with repeated transcranial magnetic stimulation (rTMS) for mild to moderate post-stroke depression. Ninety patients with mild to moderate post-stroke depression were randomly divided into a combination group (30 cases, 4 cases dropped out), an acupuncture group (30 cases, 3 cases dropped out) and a rTMS group (30 cases, 5 cases dropped out). All the three groups received basic treatment, the combination group was treated with acupuncture combined with rTMS, the acupuncture group was treated with acupuncture, and the rTMS group was treated with rTMS. The acupuncture was applied at Baihui (GV 20), Yintang (GV 24+) , Danzhong (CV 17) and bilateral Shenmen (HT 7), Taichong (LR 3), Neiguan (PC 6). All the three groups were treated once a day, 5 times a week for 4 weeks. The Hamilton depression scale (HAMD-17) score, Pittsburgh sleep quality index (PSQI) score and event-related potential were compared among the three groups before and after treatment. After treatment, the HAMD-17 scores and PSQI scores in the three groups were reduced compared with those before treatment (P<0.01) , and the HAMD-17 score and PSQI score in the combination group were lower than those in the acupuncture group and the rTMS group (P<0.05). After treatment, the latency of event-related potential (P300, mismatch negativity［MMN］) in the three groups was shortened compared with that before treatment (P<0.05), and the latency of event-related potential in the combination group was shorter than that in the acupuncture group and the rTMS group (P<0.05). Acupuncture combined with rTMS can effectively alleviate the depressive state of patients with mild to moderate post-stroke depression, improve the sleep quality and the latency of event-related potential P300 and MMN.

Neurophysiological markers of printed word processing and reading fluency in adolescence

ABSTRACT Reading fluency is one of key facets of reading performance. At the neurophysiological level, as reading skills improve, latencies of P100 and N170 shorten, and the functional role of these ERPs components is expanding. While in primary schoolchildren, only orthographic N170 effects are observed, lexical and grammatical N170 effects are traceable in adulthood. However, previous studies neglect the adolescent sample. The goal of this study was to determine whether adolescents exhibit lexical and grammatical N170 effects and explore the link between reading fluency and P100 and N170 components. We assessed 32 adolescents in the context of a grammaticality judgment ERP experiment and estimated reading fluency. We registered lexical N170 effects indicative of the presence of an adult-like lexical representation system. Moreover, we observed negative correlations between reading fluency and P100 and N170 latencies, which suggest that reading fluency is affected by the speed of visual processing captured by these latencies.