The neuroscience of perceptual categorization in pigeons: A mechanistic hypothesis

We are surrounded by an endless variation of objects. The ability to categorize these objects represents a core cognitive competence of humans and possibly all vertebrates. Research on category learning in nonhuman animals started with the seminal studies of Richard Herrnstein on the category “human” in pigeons. Since then, we have learned that pigeons are able to categorize a large number of stimulus sets, ranging from Cubist paintings to English orthography. Strangely, this prolific field has largely neglected to also study the avian neurobiology of categorization. Here, we present a hypothesis that combines experimental results and theories from categorization research in pigeons with neurobiological insights on visual processing and dopamine-mediated learning in primates. We conclude that in both fields, similar conclusions on the mechanisms of perceptual categorization have been drawn, despite very little cross-reference or communication between these two areas to date. We hypothesize that perceptual categorization is a two-component process in which stimulus features are first rapidly extracted in a feed-forward process, thereby enabling a fast subdivision along multiple category borders. In primates this seems to happen in the inferotemporal cortex, while pigeons may primarily use a cluster of associative visual forebrain areas. The second process rests on dopaminergic error-prediction learning that enables prefrontal areas to connect top down the relevant visual category dimension to the appropriate action dimension.     

Constructing a Sense of Purpose and a Professional Teaching Identity: Experiences of Teacher Candidates with Disabilities

Abstract

Using grounded theory, we examined the ways in which undergraduate teacher candidates with disabilities developed a sense of purpose and constructed professional identities. Our findings suggest K-12 experiences with advocacy as well as exclusionary school experiences influenced their emerging professional identities. Resistance to a deficit view of disability was central to teachers’ professional identities and influenced their desire to become “change agents” in their future professions. We describe collegiate experiences that affirmed or presented roadblocks to their career path.     

SCHOOL‐WIDE POSITIVE BEHAVIORAL INTERVENTIONS AND SUPPORTS FOR STUDENTS WITH EMOTIONAL AND BEHAVIORAL DISORDERS

This investigation employed a participatory action research method involving school psychology consultants and educators to design and evaluate the impact of school‐wide positive behavioral interventions and supports in a self‐contained school serving students with emotional and behavioral disorders. The traditional practices of a universal system, including teaching and acknowledging expected behaviors and responding to disruptive behaviors, were adapted to better accommodate the needs of a more challenging student population. In addition, system‐wide practices, including various teaming and professional development strategies, were instituted to promote sustainability. Results, after implementation of Tier 1, showed reductions in the frequency of discipline referrals and the number of emergency safety interventions, with a sustained impact across the next 3 years. Limitations included the lack of experimental control in evaluating the intervention. Discussion includes recommendations for an expanded role for school psychologists in promoting evidence‐based practices for high‐risk student populations.     

Contested womanhood: women’s education and (re)production of gendered norms in rural Pakistani Muslim communities

In a world marred by the fears of religious extremism, Muslim women have become subjects of various global projects that aim to modernize ‘traditional’ Muslim societies through women’s education and empowerment. Embedded in these discourses is an assumption that all educated Muslim women will empower themselves through challenging the ‘oppressive’ structures of their families and communities. This paper challenges these homogeneous narratives of education and empowerment through highlighting the complexities of educated women’s daily lives in rural Pakistan. We situate the lived experiences of rural educated Pakistani women in global mainstream as well as in local historical narratives regarding the role and purpose of education for women. Our analysis reveals how the educated women participants’ lives were shaped by a complex gendered hierarchy that facilitated educated women to take on new roles while simultaneously requiring them to maintain harmonious relationships with family and community members.     

Temperament Predicts Processing Speed in Low Socioeconomic Status Rural Preschoolers

Extreme poverty all over the world is concentrated in rural settings. However, studies about cognition in low socioeconomic status (SES) children are for the most part conducted in urban populations. This paper investigates, in a poor rural sample, what are the individual and socioenvironmental variables that make the difference in performance in a processing speed task. Forty four 5‐year‐old children were evaluated with a processing speed task; individual and socioenvironmental information was obtained from parents' interviews. Higher scores in the effortful control dimension of temperament were associated with higher performance in the processing speed task. No other individual or socioenvironmental variable predicted the performance. These results showed that effortful control is important in processing speed and suggest that in low SES rural contexts, low effortful control children would require stronger interventions.     

The Role of Unrealistic Optimism in College Student Risky Sexual Behavior

Abstract

The purpose of this study was to investigate the association between unrealistic optimism (UO) and risky sexual behavior (RSB) and related consequences in a college student sample. Participants believed they had significantly lower personal risk of engagement in alcohol-related sexual activity, unintended pregnancy, and STIs than the average college student (ps?<?0.01). Compared to national data, participants significantly underestimated likelihood of HPV and sexual engagement with four or more partners in the next year (ps?<?0.01). Findings support evidence of UO relating to RSB-related consequences, indicating need for improvements in sexual health education and intervention.     

The impact of body image and Afrocentric appearance on sexual refusal self-efficacy in early adolescent African American girls

Research examining the association between body image and sexual risk-taking has been mostly limited to clinical and/or White female samples. It is unclear whether body image plays a role in sexual risk-taking among African American early adolescent females. Moreover, research has neglected to consider body image within a cultural and ethnic framework. A positive sense of Afrocentric appearance may influence, either positively or negatively, sexual attitudes and behaviors among African American early adolescent girls. The purpose of this study, conducted with 156 urban African American early adolescent females, was to examine the relationships among body image, Afrocentric appearance, and sexual refusal self-efficacy. Results found no significant association between body image and sexual refusal self-efficacy. However, structural equation modeling found that a positive sense of Afrocentric appearance significantly predicted increased sexual refusal self-efficacy. Implications of this study in regard to culturally-based teenage pregnancy prevention and education initiatives are discussed.