ADoes Meaning in Life Buffer the Link Between Anxiety and Depression? Evidence From Young Adults

Updating prior information with new information in accordance with Bayesian principles is a difficult task. Younger adult decision makers deviate from Bayes’ theorem by either overweighting prior information (i.e., using a conservatism heuristic) or overweighting new information (i.e., using a representativeness heuristic) on decision tasks without feedback. Similar to younger adults, older adults make decisions that require belief updating. Given agerelated decrements in cognitive control, older adults may be at a disadvantage compared with younger adults when updating beliefs. Prior research shows no age differences when making decisions under risk, however older adults perform worse than younger adults when making decisions under ambiguity. Currently it is unknown how older adults use heuristics when updating beliefs about risk and ambiguous information compared with younger adults. The primary aim of this dissertation was to examine age-related differences in the use of heuristics during belief updating, as well as the cognitive processes and neural correlates that underpin behaviour. In three experiments, younger and older adults completed a belief updating task with and without feedback using an urn-ball paradigm. The main results showed that both younger and older adults committed the representativeness error more than the conservatism error, with no age differences observed when updating beliefs without feedback but with younger adults updating beliefs more accurately than older adults with feedback. Further, age differences in the neural correlates that underlie belief updating showed evidence that older adults recruit additional resources in frontal regions of the brain to facilitate performance compared with younger adults. Event-related potentials showed evidence of cognitive control in response to conflicting information in both age groups, but a diminished neural response to feedback in older compared with younger adults. Additionally, while younger adults were not influenced by ambiguous information, older adults avoided committing the representativeness error only when new information was ambiguous. Last, individual differences in numeracy and cognitive reflection, but not thinking disposition, modulated belief updating performance. Together, the results show that younger and older adults can learn to update beliefs with feedback but with younger adults learning to a greater degree than older adults, especially when information is ambiguous.

Updating prior information with new information in accordance with Bayesian principles is a difficult task. Younger adult decision makers deviate from Bayes’ theorem by either overweighting prior information (i.e., using a conservatism heuristic) or overweighting new information (i.e., using a representativeness heuristic) on decision tasks without feedback. Similar to younger adults, older adults make decisions that require belief updating. Given agerelated decrements in cognitive control, older adults may be at a disadvantage compared with younger adults when updating beliefs. Prior research shows no age differences when making decisions under risk, however older adults perform worse than younger adults when making decisions under ambiguity. Currently it is unknown how older adults use heuristics when updating beliefs about risk and ambiguous information compared with younger adults. The primary aim of this dissertation was to examine age-related differences in the use of heuristics during belief updating, as well as the cognitive processes and neural correlates that underpin behaviour. In three experiments, younger and older adults completed a belief updating task with and without feedback using an urn-ball paradigm. The main results showed that both younger and older adults committed the representativeness error more than the conservatism error, with no age differences observed when updating beliefs without feedback but with younger adults updating beliefs more accurately than older adults with feedback. Further, age differences in the neural correlates that underlie belief updating showed evidence that older adults recruit additional resources in frontal regions of the brain to facilitate performance compared with younger adults. Event-related potentials showed evidence of cognitive control in response to conflicting information in both age groups, but a diminished neural response to feedback in older compared with younger adults. Additionally, while younger adults were not influenced by ambiguous information, older adults avoided committing the representativeness error only when new information was ambiguous. Last, individual differences in numeracy and cognitive reflection, but not thinking disposition, modulated belief updating performance. Together, the results show that younger and older adults can learn to update beliefs with feedback but with younger adults learning to a greater degree than older adults, especially when information is ambiguous.

The Role of Oxytocin in Older Adults’ Facial Emotion Recognition Difficulties

Functional Assessment in Younger and Older Adults with Sickle Cell Disease

Are young adults car-loving urbanites? Comparing young and older adults’ residential location choice, travel behavior and attitudes

Introduction: The use of shared automated vehicles (SAVs) should lead to several societal and individual benefits, including reduced greenhouse gas emissions, reduced traffic, and improved mobility for persons who cannot safely drive themselves. We define SAVs as on-demand, fully automated vehicles in which passengers are paired with other riders traveling along a similar route. Previous research has shown that younger adults are more likely to report using conventional ridesharing services and are more accepting of new technologies including automated vehicles (AVs). However, older adults, particularly those who may be close to retiring from driving, stand to greatly benefit from SAV services. In order for SAVs to deliver on their aforementioned benefits, they must be viewed favorably and utilized. We sought to investigate how short educational and/or experiential videos might impact younger, middle-aged, and older adult respondents’ anticipated acceptance and attitudes toward SAVs. Knowing what types of introductory experiences improve different age groups’ perceptions of SAVs will be beneficial for tailoring campaigns aiming to promote SAV usage. Methods: We deployed an online survey using the platform Prolific for middle-aged and older respondents, and our departmental participant pool for younger adults, collecting 585 total responses that resulted in 448 valid responses. Respondents answered questions regarding their demographic attributes, their ridesharing history, preconceptions of technology, as well as their anticipated acceptance attitudes towards SAVs as measured by the dimensions of the Automated Vehicle User Perception Survey (AVUPS). After this, respondents were randomly assigned to an intervention condition where they either watched 1) an educational video about how SAVs work and their potential benefits, 2) an experiential video showing a AV navigating traffic, 3) both the experiential and educational videos, or 4) a control video explaining how ridesharing works. Anticipated acceptance attitudes towards SAVs were measured again after this intervention and difference scores calculated to investigate the effect of the intervention conditions. Prolific respondents were paid at a rate of $9.50/hour and younger adults received course credit. Results: Controlling for preconceptions of technology and ridesharing experience, a MANOVA was run on the difference scores of the dimensions of the AVUPS (intention to use, trust/reliability, perceived usefulness (PU), perceived ease of use (PEOU), safety, control/driving-efficacy, cost, authority, media, and social influence). Both older and middle-aged adults expressed significantly greater increases in PEOU and PU of SAVs than younger adults. We also observed an interaction between age and condition for both PU and PEOU. For PU, older adults’ difference scores were found to be significantly greater than younger adults’ for the control video condition. With PEOU, older adults’ difference scores were significantly greater than both younger adults’ for the control video condition, and middle-aged adults had greater difference scores for the educational-only video condition than younger or older adults. Discussion: The increases in PU observed for older adults in the control condition suggests that educating them on how to use currently available ridesharing services might transfer to and/or highlight the benefits that automated ridesharing might provide. The PEOU interactions also suggest that middle-aged adults might respond more positively than younger or older adults to an educational introduction to SAVs. Conclusion: The positive findings pertaining to PU and PEOU show that exposure to information related to SAVs has a positive impact on these attitudes. PU’s and PEOU’s positive relationship to behavioral intentions (BI) in the Technology Acceptance Model, coupled with the findings from this study, bode well for higher fidelity interventions seeking to inform and/or give individuals experience with SAVs. Providing information on how currently available ridesharing services work helped our older adult respondents recognize the potential usefulness of SAVs. Knowing that different age groups may respond better to educational versus experiential interventions, for example middle-aged adults in this study responding more positively to the educational video condition than younger or older adults, may be useful for targeted promotional campaigns.

Which is the Most Useful Patient Reported Outcome in Femoroacetabular Impingement? Test-retest Reliability of 6 Questionnaires in Young Active Adults

Although neuromuscular electrical stimulation (NMES) has been used as a safe and relevant complement to voluntary resistance training, its effectiveness in increasing quadriceps femoris muscle strength and mass in healthy young and older adults has not been determined. The aim of this scoping review was to assess the effects of NMES on quadriceps muscle strength and mass in healthy young and older adults. CENTRAL, Pedro, MEDLINE, and PubMed were searched from inception to September 2019. Randomized controlled trials (RCTs) that compared NMES with control group or voluntary resistance training for healthy young and older adults were included. Study characteristics, primary and secondary outcome parameters, and details of the NMES intervention were extracted by 2 reviewers. Only studies for which full text was available in English were included. Thirty-two RCTs including 796 healthy participants were identified as being eligible for young adults, and 5 RCTs including 123 healthy participants were identified as being eligible for older adults. The available evidence strongly suggests that NMES improves quadriceps muscle strength compared with a control group in young adults, but its efficacy seems lower than that of voluntary resistance training. The available limited evidence regarding the effects of NMES on quadriceps muscle mass compared with control in young adults is inconclusive, with 3 RCTs showing positive effects and 3 RCTs not showing positive effects. The very limited available evidence from 5 RCTs in older adults suggests that NMES might be beneficial for increasing quadriceps muscle strength and mass. Overall, the evidence indicates that NMES is an efficacious method for increasing quadriceps muscle strength in young adults, whereas its impact on muscle mass requires further investigations. In addition, the effectiveness of NMES needs to be confirmed in older adults on the basis of more high-quality RCTs with larger sample sizes. This scoping review of 37 RCTs including 919 people is the first study, to the authors' knowledge, to show that the use of NMES increases quadriceps muscle strength in young adults and might improve quadriceps muscle strength compared with control interventions in older adults. In both young and older adults, the effects of NMES on quadriceps muscle mass are still unclear.

In order to be able to take preventative measures early in life against the development of atherosclerosis, it is important to evaluate profiles of subclinical atherosclerosis, especially among young adults. We screened plasma homocysteine levels, highly sensitive C-reactive protein levels and carotid intima-media thickness in young and elderly adults. Among both young and elderly adults, plasma homocysteine and highly sensitive C-reactive protein were significantly lower in females than in males. Highly sensitive C-reactive protein was significantly lower in young adults than in elderly adults, and homocysteine was lower (but not significantly) in young adults than in elderly adults. Among young adults, mean carotid intima-media thickness was lower (but not significantly) in females than in males. Among elderly adults, mean carotid intima-media thickness was significantly lower in females than in males. Among both males and females, mean carotid intima-media thickness was significantly higher in elderly adults than in young adults. These results demonstrate basic profiles of atherosclerosis markers in young and elderly Japanese adults. Further study is needed to evaluate measures developed for application in early adulthood to prevent atherosclerosis.

Using a lifespan approach, the authors investigated developmental features of the control of ballistic aiming arm movements by manipulating movement complexity, response uncertainty, and the use of precues. Four different age groups of participants (6- and 9-year-old boys and girls and 24- and 73-year- old men and women, 20 participants in each age group) performed 7 types of rapid aiming arm movements on the surface of a digitizer. Their movement characteristics such as movement velocity, normalized jerk, relative timing, movement linearity, and intersegment intervals were profiled. Analyses of variance with repeated measures were conducted on age and task effects in varying movement complexity (Study 1), response uncertainty (Study 2), and precue use (Study 3) conditions. Young children and senior adults had slower, more variant, less smooth, and less linear arm movements than older children and young adults. Increasing the number of movement segments resulted in slower and more variant responses. Movement accuracy demands or response uncertainty interacted with age so that the 6- and 74-year-old participants had poorer performances but responded similarly to the varying treatments. Even though older children and young adults had better performances than young children and senior adults, their arm movement performance declined when response uncertainty increased. The analyses suggested that young children's and senior adults' performances are poorer because less of their movement is under central control, and they therefore use on-line adjustments. In addition, older children and young adults use a valid precue more effectively to prepare for subsequent movements than do young children and senior adults, suggesting that older children and young adults are more capable of organizing motor responses than arc young children and senior adults.

New Findings What is the central question of this study? We sought to investigate whether carotid stiffness, carotid intima–media thickness and the aortic augmentation index are altered in young adults 3–4 weeks after contraction of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) compared with young healthy adults. What is the main finding and its importance? We found that carotid stiffness, Young's modulus and the aortic augmentation index were greater in young adults who tested positive for SARS‐CoV‐2 compared with healthy young adults. These findings provide additional evidence for detrimental effects of SARS‐CoV‐2 on young adult vasculature, which might have implications for cardiovascular health. Contracting severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) has been observed to cause decrements in vascular function of young adults. However, less is known about the impact of SARS‐CoV‐2 on arterial stiffness and structure, which might have additional implications for cardiovascular health. The purpose of this study was to assess the carotid artery stiffness and structure using ultrasound and the aortic augmentation index (AIx) using applanation tonometry in young adults after they tested positive for SARS‐CoV‐2. We hypothesized that carotid artery stiffness, carotid intima–media thickness (cIMT) and aortic AIx would be elevated in young adults with SARS‐CoV‐2 compared with healthy young adults. We evaluated 15 young adults (six male and nine female; 20 ± 1 years of age; body mass index, 24 ± 3 kg m−2) 3–4 weeks after a positive SARS‐CoV‐2 test result compared with young healthy adults (five male and 10 female; 23 ± 1 years of age; body mass index, 22 ± 2 kg m−2) who were evaluated before the coronavirus 2019 pandemic. Carotid stiffness, Young's modulus and cIMT were assessed using ultrasound, whereas aortic AIx and aortic AIx standardized to 75 beats min−1 (AIx@HR75) were assessed from carotid pulse wave analysis using SphygmoCor. Group differences were observed for carotid stiffness (control, 5 ± 1 m s−1; SARS‐CoV‐2, 6 ± 1 m s−1), Young's modulus (control, 396 ± 120 kPa; SARS‐CoV‐2, 576 ± 224 kPa), aortic AIx (control, 3 ± 13%; SARS‐CoV‐2, 13 ± 9%) and aortic AIx@HR75 (control, −3 ± 16%; SARS‐CoV‐2, 10 ± 7%; P < 0.05). However, cIMT was similar between groups (control, 0.42 ± 0.06 mm; SARS‐CoV‐2, 0.44 ± 0.08 mm; P > 0.05). This cross‐sectional analysis revealed higher carotid artery stiffness and aortic stiffness among young adults with SARS‐CoV‐2. These results provide further evidence of cardiovascular impairments among young adults recovering from SARS‐CoV‐2 infection, which should be considered for cardiovascular complications associated with SARS‐CoV‐2.

When we compare young French adults of between 18 and 29 years of age with their European counterparts, we see that the French live at home with their parents for longer periods of time, that they are less frequently inactive and more often students or unemployed than European average. A substantial number have their own means of support - employment generated income accounts for some 80% of their private resources and social security benefits for about 15%, which is again slightly above the European average. The fact that they live at home with their parents improves their standard of living which is among the highest in the community; poverty levels are close to the European average (Chambaz, 2001). These findings, obtained on the basis of an enquiry conducted on a representative selection of European households, confirm the view, adopted by the French media, politicians and administration, that the young adults of the present day, whether students or unemployed, are overgrown children (grands enfants) largely supported by their families and by the State1.Although international comparisons show that the living conditions of young French adults have decreased relatively less than those of other European countries, scientific, political and administrative commentaries on the new risks incurred by the younger population have steadily gained ground since the mid 90's. There is a growing concern about the increased dependence of young persons on adult communities and, in particular, on their own family. To designate this greater degree of interdependence between generations in the context of the progressive undermining of social insertion mechanisms, the expression jeunes adultes (young adults) has been adopted. The recent introduction of this category both in the administrative and scientific domains and by the media constitutes an invitation to researchers to examine the conditions that have given rise to it, and thus to better comprehend the coupling of two terms which, at first sight, would appear to be diametrically opposed: young and adult.BIRTH AND MEANING OF THIS CATEGORY IN SOCIAL AND SCHOLAR DEBATESThe expression 'young adults' is gradually replacing other appellations such as 'postadolescents' or, very simply, 'the young'. Moreover, it is being used 'across the board', so to speak, and applies equally to school-goers and to young job-seekers. In this way we are witnessing a more homogeneous treatment of young people after years of bracketing by age group (Cicchelli, 2002). This grouping follows from political and administrative recognition of the three major factors affecting today the young people2: the deterioration of the professional insertion mechanisms available to young adults (Nicole-Drancourt and RoulleauBerger, 2001; Ponthieux, 1997); the dilution of stages leading to adult life (Galland, 2000) and the extension of schooling to include higher education (Erlich, 1998). Notwithstanding the fact that each of these three factors has its own particular logic, they are generally treated jointly, and this raises the question of the dividing line between the care provided by young person's family and that provided by the State's social services with respect to the financing of studies and protection against unemployment and social alienation. More recent social debate on the subject tends to recognise more common ground between the young adult student and the young adult who is as yet insufficiently inserted into the social system: the demands for a 'statut etudianf (student status) are now abandoned in favour of a request for an allocation autonomie' (autonomy allowance) for all young persons.Moreover, it is as if in every official discourse and political solution envisaged and strongly advocated, the family was the sole agent responsible for the cost of 'socialising' the young. Such 'familialisation' of young persons, that is to say the assignment of youth care to the family (Labadie, 2001), became the most visible mark of the dependence between the generations. …

This study investigates whether Lesbian, Gay and Bisexual (LGB) young adults are more at risk of bullying than their heterosexual peers using Next Steps, a nationally representative longitudinal dataset from England. The experiences of more than 7,200 young adults from across England who were born in 1989–90 are examined. At age 20, the young adults were asked about their sexual identity and whether they had been bullied in the previous 12 months and during secondary school. The findings show that young LGB adults had a 52 per cent chance of having been bullied in the past year at age 20, compared to a 38 per cent chance for their heterosexual peers, after taking into account other characteristics that may make someone more likely to be targeted, such as gender, ethnicity, disability, or family socioeconomic background. The situation had improved slightly since their school years. Between the ages of 14 and 16, young people who later went on to identify as LGB had a 56 per cent chance of having been bullied in the past year, compared to a 45 per cent chance for their heterosexual peers. Moreover LGB young people were at considerably greater risk of being bullied frequently – that is, once or more every fortnight – during secondary school. LGB young people were found to be more than twice as likely as their heterosexual classmates to be regularly physically bullied and excluded from social groups. This paper also examines the association between being bullied and life satisfaction: the findings show that by the time they reached age 20, young LGB adults were less likely than their heterosexual peers to report being “very satisfied” with how their lives had turned out so far. However, all young adults – regardless of sexual identity – were less likely to be very satisfied with their lives if they had been bullied. In summary, although all people are less likely to be bullied as they get older, young LGB adults remain at higher risk than their peers. These findings suggest that in order to tackle the problem, anti-bullying interventions cannot be focused only at schools and their pupils. Policymakers, employers, further education institutions and others working with young adults need to do just as much in order to challenge discrimination at all ages.

Locomotor perturbations provide insights into humans' response to motor errors. We investigated the differences in motor adaptation and muscle cocontraction between young and older adults during perturbed-arm and -leg recumbent stepping. We hypothesized that besides prolonged adaptation due to use-dependent learning, older adults would exhibit greater muscle cocontraction than young adults in response to the perturbations. Perturbations were brief increases in resistance applied during each stride at the extension onset or midextension of the left or right leg. Seventeen young adults and eleven older adults completed four 10-min perturbed stepping tasks. Subjects were instructed to follow a visual pacing cue, step smoothly, and use all their limbs to drive the stepper. Results showed that young and older adults did not decrease their errors with more perturbation experience, and errors did not wash out after perturbations were removed. Interestingly, older adults consistently had smaller motor errors than young adults in response to the perturbations. Older adults used fewer muscles to drive the stepper and had greater cocontraction than young adults. The results suggest that, despite similar motor error responses, young and older adults use distinctive muscle recruitment patterns to perform the motor task. Age-related motor strategies help track motor changes across the human life span and are a baseline for rehabilitation and performance assessment.NEW & NOTEWORTHY Older adults often demonstrate greater cocontraction and motor errors than young adults in response to motor perturbations. We demonstrated that older adults reduced their motor errors more than young adults with brief perturbations during recumbent stepping while maintaining greater muscle cocontraction. In doing so, older adults largely used one muscle pair to drive the stepper, tibialis anterior and soleus, whereas young adults used all muscles. These two muscles are crucial for maintaining upright balance.

Background: A significant proportion of vehicle accidents in the UK are caused by drivers falling asleep at the wheel and these accidents often occur at high speeds and result in fatalities (Home & Reyner, 1995b). Research has shown that driving after 15 or more hours of wakefulness increases the risk of being involved in a sleep-related vehicle accident (Stutts et al., 2003). Further, young and elderly adults have been found to have more sleep-related accidents between midnight and 6am and between 3pm and 6pm, respectively (Summala & Mikkola, 1994). An extended theory of planned behaviour (TPB; Ajzen, 1988,1991) was used to understand the reasons why young, middle-aged and elderly adults drive while sleep impaired with a view to reducing the incidence of this behaviour. Specifically, the determinants of driving after 15 or more hours of wakefulness, between midnight and 6am and between 3pm and 6pm were explored. Methods: A preliminary study in which sleep duration and quality were measured in young, middle-aged and elderly adults established the validity of actigraphy to reliably differentiate periods of sleep and wake. After identifying the accessible beliefs underlying each specific behaviour and constructing questionnaires tailored to each age group and behaviour, the main study was conducted. Two hundred and ten young, middle-aged and elderly adults completed TPB questionnaires in relation to driving after being awake for 15 or more hours in the following week. Measures of behaviour (using both subjective and objective methods, i.. e., actigraphy) were obtained eight days later from the young adults. Additionally, the young and elderly adults completed TPB measures regarding driving between midnight and 6am and between 3pm and 6pm, respectively. The young adults provided behavioural data prospectively. The ability of anticipated regret, impulsive sensation seeking, past behaviour and gender to account for additional proportions of variance over and above the TPB was also explored. Results: The TPB explained significant proportions of variance in intention to drive after 15 or more hours of wakefulness in all three age groups. Injunctive norm was a consistent predictor in all groups. The model predicted a subjective measure of driving after 15 or more hours of wakefulness but failed to predict a more objective measure, obtained from the young adults. Both the young adults' intentions to drive between midnight and 6am and their self-reported behaviour were successfully predicted by the TPB, as were the intentions of elderly adults to drive between 3pm and 6pm. Several beliefs which discriminated those who did and who did not perform (or intend to perform) the behaviours were identified. Anticipated regret independently predicted the intentions of young adults to drive after 15 or more hours of wakefulness and between midnight and 6am, as well as the intentions of elderly adults to drive between 3pm and 6pm. The TPB failed to mediate the effect of gender on driving between midnight and 6am in the young adults. Conclusions: The TPD provided useful, but not sufficient, accounts of the determinants of intentions to drive while sleep impaired. The model was able to predict subjective measures of sleep impaired driving but failed to predict a measure based on more objective methods. This research can be used to inform interventions attempting to reduce sleep impaired driving. A number of possible behavioural change strategies are proposed based on the empirical, theory-based results obtained here.