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Tomoko Suzuki,1 Koji Wada,1,2 Michiko Nakazato,3 Toshiyuki Ohtani,4 Michiko Yamazaki,2 Shunya Ikeda1,2 1Department of Public Health, School of Medicine, International University of Health and Welfare, Narita, Japan; 2Department of Social Medical Sciences, Graduate School of Medicine, International University of Health and Welfare, Tokyo, Japan; 3Department of Psychiatry, School of Medicine, International University of Health and Welfare, Narita, Japan; 4Safety and Health Organization, Chiba University, Chiba, JapanCorrespondence: Tomoko Suzuki, Department of Public Health, School of Medicine, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, 286-8686, Japan, Tel +81-476-20-7701, Fax +81-476- 28-1188, Email tsuzuki7@iuhw.ac.jp; tsuzuki2992@gmail.comPurpose: Most previous studies that described associations between adult attention-deficit/hyperactivity disorder (ADHD) and sociodemographic characteristics were focused on individuals diagnosed with ADHD, and few studies investigated ADHD traits in the general population. Additionally, some workers, who experienced no problems while at university and successfully graduated from university, developed ADHD traits after finding employment. This study described associations between ADHD traits and sociodemographic characteristics among Japanese workers who were university graduates.Patients and Methods: Participants were randomly selected workers (n=1240) from across Japan who completed a self-administered online survey. ADHD traits were measured using an adult ADHD Self-report Scale, with scoring rules applied to reflect the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition criteria. Information was collected on sociodemographic characteristics including sex, age, socioeconomic status, working time, and health-related behaviors. We performed partial correlation analysis to estimate trend associations and used analysis of covariance to compare adjusted averages. This model was adjusted for all variables.Results: Males had higher levels of ADHD traits than females (p = 0.001), and younger age was associated with higher levels of ADHD traits (p < 0.001). Workers with low incomes had higher levels of ADHD traits than workers with high incomes (p = 0.009). More frequent consumption of midnight meals was associated with higher levels of ADHD traits (p < 0.001), although there were no differences for breakfast, lunch, and dinner. Those who did not get enough rest from sleep had higher levels of ADHD traits (p = 0.007).Conclusion: Results for high levels of ADHD traits among workers were consistent with previous studies for adults diagnosed with ADHD, even though all participants had successfully graduated from university. Assessment of these ADHD traits may support prevention of health deterioration related to these ADHD traits.Keywords: ADHD traits, eating habits, income, lifestyle habits, sleep, socioeconomic status

We report two experiments investigating the effect of working memory (WM) load on selective attention. Experiment 1 was a modified version of Lavie et al. and confirmed that increasing memory load disrupted performance in the classic flanker task. Experiment 2 used the same manipulation of WM load to probe attention during the viewing of complex scenes while also investigating individual differences in attention deficit hyperactivity disorder (ADHD) traits. In the image-viewing task, we measured the degree to which fixations targeted each of two crucial objects: (1) a social object (a person in the scene) and (2) a non-social object of higher or lower physical salience. We compared the extent to which increasing WM load would change the pattern of viewing of the physically salient and socially salient objects. If attending to the social item requires greater default voluntary top-down resources, then the viewing of social objects should show stronger modulation by WM load compared with viewing of physically salient objects. The results showed that the social object was fixated to a greater degree than the other object (regardless of physical salience). Increased salience drew fixations away from the background leading to slightly increased fixations on the non-social object, without changing fixations on the social object. Increased levels of ADHD-like traits were associated with fewer fixations on the social object, but only in the high-salient, low-load condition. Importantly, WM load did not affect the number of fixations on the social object. Such findings suggest rather surprisingly that attending to a social area in complex stimuli is not dependent on the availability of voluntary top-down resources. [ABSTRACT FROM AUTHOR]

Background: Atypical reactions to the sensory environment are often reported in autistic individuals, with a high degree of variability across the sensory modalities. These sensory differences have been shown to promote challenging behaviours and distress in autistic individuals and are predictive of other functions including motor, social, and cognitive abilities. Preliminary research suggests that specific sensory differences may cluster together within individuals creating discrete sensory phenotypes. However, the manner in which these sensory differences cluster, and whether the resulting phenotypes are associated with specific cognitive and social challenges is unclear. Methods: Short sensory profile data from 599 autistic children and adults between the ages of 1 and 21 years were subjected to a K-means cluster analysis. Analysis of variances compared age, adaptive behaviour, and traits associated with autism, attention-deficit and hyperactivity disorder, and obsessive and compulsive disorder across the resultant clusters. Results: A five-cluster model was found to minimize error variance and produce five sensory phenotypes: (1) sensory adaptive, (2) generalized sensory differences, (3) taste and smell sensitivity, (4) under-responsive and sensation seeking, and (5) movement difficulties with low energy. Age, adaptive behaviour, and traits associated with autism, attention-deficit and hyperactivity disorder, and obsessive and compulsive disorder were found to differ significantly across the five phenotypes. Limitations: The results were based on parent-report measures of sensory processing, adaptive behaviour, traits associated with autism, attention-deficit and hyperactivity disorder, and obsessive and compulsive disorder, which may limit the generalizability of the findings. Further, not all measures are standardized, or psychometrically validated with an autism population. Autistic individuals with an intellectual disability were underrepresented in this sample. Further, as these data were obtained from established records from a large provincial database, not all measures were completed for all individuals. Conclusions: These findings suggest that sensory difficulties in autistic individuals can be clustered into sensory phenotypes, and that these phenotypes are associated with behavioural differences. Given the large degree of heterogeneity in sensory difficulties seen in the autistic population, these sensory phenotypes represent an effective way to parse that heterogeneity and create phenotypes that may aid in the development of effective treatments and interventions for sensory difficulties. [ABSTRACT FROM AUTHOR]

Objectives: Attention deficit hyperactivity disorder (ADHD) is associated with increased criticism from others. To date, there is little research considering the consequences of how others respond to people with ADHD. Self-compassion is a positive way of relating to oneself during difficulty. Here, we investigate whether levels of self-compassion differ between people with and without ADHD, and whether perceived criticism mediates any differences in self-compassion between people with and without ADHD. Methods: A cross-sectional design was used to conduct natural group comparisons. A sample of 1203 adults (46% with a self-reported ADHD diagnosis) recruited via social media, online forums and posters completed online self-report measures of diagnostic status, ADHD traits, self-compassion and perceived criticism. Between-group comparisons of self-compassion and perceived criticism were conducted on participants grouped by diagnosis, then grouped by ADHD trait severity. Perceived criticism was tested as a mediator variable between ADHD diagnosis and self-compassion. Results: Adults with an ADHD diagnosis showed significantly lower self-compassion and higher perceived criticism than the participants without ADHD. Participants high in ADHD traits but without a diagnosis had significantly similar levels of self-compassion to the diagnosed group. Mediation analysis found that higher perceived criticism partially explained the relationship between ADHD diagnosis and self-compassion, even after accounting for co-occurring mood disorder diagnosis. Conclusions: Adults with ADHD are less self-compassionate than adults without ADHD. This is partially explained by the higher level of criticism they perceive from others. [ABSTRACT FROM AUTHOR]

Summary: This study investigated whether early signs of attention deficit hyperactivity disorder (ADHD) in toddlers aged 2–3 years are associated with disturbed sleep and activity levels. Participants were recruited from the Odense Child Cohort, and children scoring above the 93rd percentile on the ADHD scale of the Child Behaviour Checklist 1½–5 were categorised as cases and compared with age‐ and gender‐matched normal‐scoring controls. Daytime and nocturnal activity for 24 children with ADHD traits (cases) and 25 healthy controls was assessed through 7 days of actigraphy, and parents completed the Children's Sleep Habits Questionnaire (CSHQ) and the ADHD Rating Scale IV Preschool Version (ADHD‐RS). Cases differed significantly on actigraphic parameters by having fewer minutes of moderate‐to‐vigorous physical activity (MVPA), prolonged total sleep time, fewer sleep interruptions, and increased night‐to‐night variability. A significant association was found between fewer minutes of MVPA and higher parent‐reported motor activity on the ADHD‐RS. Furthermore, increased night‐to‐night variability was significantly associated with higher total scores on both CSHQ and ADHD‐RS. The findings show that early signs of ADHD are associated with an irregular sleep pattern and lower daytime activity, as illustrated by actigraphy. Studies investigating early ADHD risk factors could lead to a preschool ADHD risk index to help guide future early intervention. [ABSTRACT FROM AUTHOR]