Velocity-based motion categorization by pigeons

To examine if animals could learn action-like categorizations in a manner similar to noun-based categories, eight pigeons were trained to categorize rates of object motion. Testing 40 different objects in a go/no-go discrimination, pigeons were first trained to discriminate between fast and slow rates of object rotation around their central y-axis. They easily learned this velocity discrimination and transferred it to novel objects and rates. This discrimination also transferred to novel types of motions including the other two axes of rotation and two new translations around the display. Comparable tests with rapid and slow changes in the objects' size, color, and shape failed to support comparable transfer. This difference in discrimination transfer between motion-based and property-based changes suggests the pigeons had learned motion concept rather than one based on change per se. The results provide evidence that pigeons can acquire an understanding of motion-based actions, at least with regard to the property of object velocity. This may be similar to our use of verbs and adverbs to categorize different classes of behavior or motion (e.g., walking, jogging, or running slow vs. fast).     

ADHERENCE TO DISCRETE‐TRIAL INSTRUCTION PROCEDURES BY RURAL PARENTS OF CHILDREN WITH AUTISM

Parents of children with autism spectrum disorders may not attempt treatment, even when effective treatment options are available. Little is known about how to improve frequency of attempts to implement treatment (‘treatment adherence’). We provided 32 rural parents of young children with autism spectrum disorders with either written or video training materials about how to implement discrete‐trial instruction and compared parental adherence between the written (control) and video (experimental) groups. Parents who received video instructions adhered to the training procedures to a significantly greater extent than did parents who received written instructions, suggesting that instruction format is a predictor of training success. Copyright © 2014 John Wiley & Sons, Ltd.     

The Relation between Parent Mental Health and Child Internalizing Symptoms in Parent–Child Interaction Therapy

Journal of Child and Family Studies - The present study evaluated whether families receiving Parent–Child Interaction Therapy (PCIT) experienced significant improvements in both parent and...     

Is there an Upside to Social Withdrawal? Considering Well-Being among Socially Withdrawn Emerging Adults

Removing oneself from social interactions, referred to as social withdrawal, has primarily been shown to predict maladjustment. Previous research distinguishing between social withdrawal subtypes based on individual differences in underlying social motivations, indicates that shyness and avoidance are more problematic than unsociability, particularly during the emerging adulthood years. Nevertheless, little research has examined the potential upside to social withdrawal. The aim of this study was to consider differences in well-being between sociable, shy, avoidant, and unsociable emerging adults. Participants included 813 Canadian university students between the ages of 18 to 25. Participants completed a series of self-report surveys assessing social withdrawal and indices of well-being. Results showed that unsociable emerging adults reported significantly greater happiness, satisfaction with their lives, social support, and self-worth than both shy and avoidant emerging adults. Social withdrawal is largely viewed as detrimental to psychosocial functioning; however, these findings show that unsociability might not pose the same risk to emerging adults’ well-being as shyness or avoidance. Indicators of well-being among unsociable emerging adults did not significantly differ from their more sociable counterparts, suggesting there may be an upside to social withdrawal for unsociable individuals.

     

The specificity of learned parallelism in dual-memory retrieval

Retrieval of two responses from one visually presented cue occurs sequentially at the outset of dual-retrieval practice. Exclusively for subjects who adopt a mode of grouping (i.e., synchronizing) their response execution, however, reaction times after dual-retrieval practice indicate a shift to learned retrieval parallelism (e.g., Nino & Rickard, in Journal of Experimental Psychology: Learning, Memory, and Cognition, 29, 373–388, 2003). In the present study, we investigated how this learned parallelism is achieved and why it appears to occur only for subjects who group their responses. Two main accounts were considered: a task-level versus a cue-level account. The task-level account assumes that learned retrieval parallelism occurs at the level of the task as a whole and is not limited to practiced cues. Grouping response execution may thus promote a general shift to parallel retrieval following practice. The cue-level account states that learned retrieval parallelism is specific to practiced cues. This type of parallelism may result from cue-specific response chunking that occurs uniquely as a consequence of grouped response execution. The results of two experiments favored the second account and were best interpreted in terms of a structural bottleneck model.     

Timing of Stressful Life Events Affects Stability and Change of Neuroticism

Neuroticism is a predictor of many health problems. To study the determinants of within‐subject change in neuroticism, three hypotheses were tested: (i) subjects who experienced stressful life events (SLEs) show an increase in neuroticism; (ii) high baseline neuroticism moderated this effect; and (iii) recent SLEs had a greater impact on neuroticism than distant SLEs. Data came from the Finnish Twin Cohort. Neuroticism data were collected in 1975 and 1981 and SLEs data in 1981 (n = 21 085). By entering baseline neuroticism as a predictor for neuroticism at follow‐up, the outcome measure was change in neuroticism. Changes in neuroticism were predicted from SLE indices or their interaction with baseline neuroticism. Timing of SLEs was taken into account by distinguishing recent from distant SLEs. To control for confounding by shared genes and environments, both within‐twin pair and between‐twin pair effects were tested for monozygotic and dizygotic twin pairs separately. Neuroticism's six‐year stability was high (r = .58, p < .001). Exposure to SLEs modestly increased neuroticism (βs > .55, ps < .001), unconfounded by shared genes. This effect was not moderated by high baseline neuroticism. Recent SLEs (.09 < βs < .15) had more impact than distant SLEs (.03 < βs < .11; ps < .01). In conclusion, the findings strongly supported a model of environmentally driven SLEs causing dynamic fluctuations around a person's set point of neuroticism. Copyright © 2013 John Wiley & Sons, Ltd.     

Frontotemporal neural systems supporting semantic processing in Alzheimer’s disease

We hypothesized that semantic memory for object concepts involves both representations of visual feature knowledge in modality-specific association cortex and heteromodal regions that are important for integrating and organizing this semantic knowledge so that it can be used in a flexible, contextually appropriate manner. We examined this hypothesis in an fMRI study of mild Alzheimer’s disease (AD). Participants were presented with pairs of printed words and asked whether the words matched on a given visual–perceptual feature (e.g., guitar, violin: SHAPE). The stimuli probed natural kinds and manufactured objects, and the judgments involved shape or color. We found activation of bilateral ventral temporal cortex and left dorsolateral prefrontal cortex during semantic judgments, with AD patients showing less activation of these regions than healthy seniors. Moreover, AD patients showed less ventral temporal activation than did healthy seniors for manufactured objects, but not for natural kinds. We also used diffusion-weighted MRI of white matter to examine fractional anisotropy (FA). Patients with AD showed significantly reduced FA in the superior longitudinal fasciculus and inferior frontal-occipital fasciculus, which carry projections linking temporal and frontal regions of this semantic network. Our results are consistent with the hypothesis that semantic memory is supported in part by a large-scale neural network involving modality-specific association cortex, heteromodal association cortex, and projections between these regions. The semantic deficit in AD thus arises from gray matter disease that affects the representation of feature knowledge and processing its content, as well as white matter disease that interrupts the integrated functioning of this large-scale network.     

Top Ten Questions Male Sexual Abuse Survivors Want to Know from Health Care Research

Sexual abuse is an often overlooked public health issue for boys and men. Given its prevalence and well-documented connection to mental and physical health disorders, the relevance of male survivor input and engagement in health care research is profound. Using a community-based participatory research design, an in-person focus group with male survivors of sexual abuse and researchers was conducted. This paper describes the top ten research questions male sexual abuse survivors would like to have answered. Survivors were most interested in knowing how sexual abuse and assault impact men’s emotional and sexual functioning, what factors are involved in preventing and treating sexual assault-related emotional distress, and what can be done to prevent sexual abuse of boys and men. The fact that some of the questions survivors expressed an interest in knowing about have actually previously been investigated by researchers suggests a disconnect in translating evidence-based findings. Clinical and research implications include designing outreach interventions and gender-specific psychoeducation to increase engagement and access to care for men.