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Adults with high ADHD traits (H-ADHD) face challenges in academics, social interactions, and careers, yet their attention characteristics remains unclear. Using Attention Network Test (ANT), we examine attentional characteristics (including specific attentional qualities and overall attentional performance) of H-ADHD and explore how their specific attentional qualities impact overall attentional performance. We find H-ADHD primarily manifests lower alerting network, higher intra-individual coefficient of variation (ICV) and poorer balanced integration score (BIS). These results remain stable even after controlling for covariates such as anxiety and depression scores. Furthermore, the BIS deficiency in high attention deficit traits group (H-ADHD-I) specifically manifests as "high accuracy—slow reaction time," reflecting their response pattern as the reaction time compensated accuracy. Additionally, compared to alerting network, attentional variability (ICV) has a greater role in mediating the impact of ADHD symptoms on overall attentional performance (BIS). Taken together, H-ADHD mainly exhibit deficits in sustained attention (alerting network), attentional stability (ICV), and overall attentional performance. ADHD symptoms worsen overall attentional performance due to increased attentional variability. The study emphasizes the sensitivity of alerting network, ICV, and BIS indicators, and highlights the significance of attentional variability, suggesting their potential clinical value in the future. [ABSTRACT FROM AUTHOR]

Background and Hypothesis Schizotypy has been conceptualized as a continuum of symptoms with marked genetic, neurobiological, and sensory-cognitive overlaps to schizophrenia. Hierarchical organization represents a general organizing principle for both the cortical connectome supporting sensation-to-cognition continuum and gene expression variability across the cortex. However, a mapping of connectome hierarchy to schizotypy remains to be established. Importantly, the underlying changes of the cortical connectome hierarchy that mechanistically link gene expressions to schizotypy are unclear. Study Design The present study applied novel connectome gradient on resting-state fMRI data from 1013 healthy young adults to investigate schizotypy-associated sensorimotor-to-transmodal connectome hierarchy and assessed its similarity with the connectome hierarchy of schizophrenia. Furthermore, normative and differential postmortem gene expression data were utilized to examine transcriptional profiles linked to schizotypy-associated connectome hierarchy. Study Results We found that schizotypy was associated with a compressed functional connectome hierarchy. Moreover, the pattern of schizotypy-related hierarchy exhibited a positive correlation with the connectome hierarchy observed in schizophrenia. This pattern was closely colocated with the expression of schizophrenia-related genes, with the correlated genes being enriched in transsynaptic, receptor signaling and calcium ion binding. Conclusions The compressed connectome hierarchy suggests diminished functional system differentiation, providing a novel and holistic system-level basis for various sensory-cognition deficits in schizotypy. Importantly, its linkage with schizophrenia-altered hierarchy and schizophrenia-related gene expression yields new insights into the neurobiological continuum of psychosis. It also provides mechanistic insight into how gene variation may drive alterations in functional hierarchy, mediating biological vulnerability of schizotypy to schizophrenia. [ABSTRACT FROM AUTHOR]

Autism spectrum disorders (ASDs) are characterized by deficits in social functioning, stereotyped patterns of behaviors, narrowed interests, and elevated anxiety. Certain ASD symptoms can persist, whereas others may improve throughout the lifespan, but the specific patterns of changes have not been clearly delineated. Using a valproic acid (VPA) rat model of ASD, the present study took a developmental approach and examined how autistic-like behaviors, including anxiety-like behavior, object obsession, and social functioning deficits, manifested differently in three critical periods representing preadolescent (postnatal day [PND] 25), adolescent (PND 45), and adulthood life stage (PND 75) in a sex-dependent manner. Starting on PNDs 25, 45, and 75, VPA- or saline-exposed male and female offspring were tested in an elevated plus maze (EPM) and a newly validated composite social and object interaction and a triple recognition test (object, spatial, and social recognition). Across the three age groups, VPA-exposed offspring did not exhibit enhanced anxiety-like behavior in the EPM nor enhanced object interaction ("object obsession") in the triple recognition test. However, both male and female preadolescent (PND 25) VPA-exposed offspring showed a significantly increased latency to initiate social contact than the saline-exposed controls, although their latencies to contact novel objects were comparable to those of the controls. Male preadolescent and adolescent VPA-exposed offspring, to a lesser extent the female preadolescent offspring, exhibited significantly lower levels of social interaction. These social functioning deficits were absent in adult VPA offspring. Additionally, prenatal VPA exposure did not cause an impairment of object recognition, spatial recognition, or social recognition of a familiar conspecific. Unexpectedly, it enhanced social recognition of a novel conspecific, but only in adolescent female offspring. These findings suggest that this rat model based on prenatal VPA exposure is valid in capturing early social motivational and functioning deficits but is limited in its capacity to model increased object obsession and enhanced anxiety as seen in ASD, as well as the developmental trajectory of non-social ASD symptoms. Recognizing these limitations is important as it informs us how to properly use this model to investigate the neurobiology of ASD and incentivizes us to develop better rodent models., (© 2024 Wiley Periodicals LLC.)