Organization, development and function of complex brain networks

Recent research has revealed general principles in the structural and functional organization of complex networks which are shared by various natural, social and technological systems. This review examines these principles as applied to the organization, development and function of complex brain networks. Specifically, we examine the structural properties of large-scale anatomical and functional brain networks and discuss how they might arise in the course of network growth and rewiring. Moreover, we examine the relationship between the structural substrate of neuroanatomy and more dynamic functional and effective connectivity patterns that underlie human cognition. We suggest that network analysis offers new fundamental insights into global and integrative aspects of brain function, including the origin of flexible and coherent cognitive states within the neural architecture.     

Why are attributions to discrimination interpersonally costly? A test of system- and group-justifying motivations

In two studies, Whites' endorsement of system-justifying beliefs predicted increased negativity toward Blacks who blamed negative events on discrimination. Whites' system-justifying beliefs were not associated with negativity toward Blacks who blamed negative events on other internal causes, external causes, or nondiscriminatory unfairness. These negative reactions toward discrimination claimants were mediated by perceptions that the claimant held dissimilar values and failed to take personal responsibility for outcomes. In both studies, participants' White Identification did not moderate the relationship between the Black target's attribution for failure and subsequent negative perceptions of that individual, thus providing evidence against a group-justification explanation of these findings.     

Timing in pigeons: effects of the similarity between intertrial interval and gap in a timing signal

Previous research suggests that when a fixed interval is interrupted (known as the gap procedure), pigeons tend to reset memory and start timing from 0 after the gap. However, because the ambient conditions of the gap typically have been the same as during the intertrial interval (ITI), ambiguity may have resulted. In the present experiment, the authors found that when ambient conditions during the gap were similar to the ITI, pigeons tended to reset memory, but when ambient conditions during the gap were different from the ITI, pigeons tended to stop timing, retain the duration of the stimulus in memory, and add to that time when the stimulus reappeared. Thus, when the gap was unambiguous, pigeons timed accurately.     

Supporting communication in young children with developmental disabilities

The behavior of parents, adult caregivers, and peers comprises the critical features of community support for the development of communication in young children with developmental disabilities. In a bio-ecological model of development, communication development is the result of the interactions of individuals with specific characteristics, in particular contexts over time. From the perspective of this model, foundational findings of intervention research to current views of communication development in children with developmental disabilities are summarized. The contributions of individual child characteristics to child-caregiver interactions that support language development are illustrated based on research with children who have autism, Williams syndrome, Down syndrome, and children who use augmentative communication systems. Parent-child interaction and the quality and quantity of parent talk are discussed as factors in children's language development. The effects of young children's delayed language on their interactions with peers, the contributions of peers to children's language learning and use, and the critical features of classroom settings that support child language development are reviewed. MRDD Research Reviews 7:143-150, 2001.     

Stigmata and negotiated outcomes: Management of appearance by persons with physical disabilities

This paper explores the role of clothing in the management of appearances by persons with disabilities. A negotiated outcomes perspective is used to study the clothing choices of disabled persons, rather than viewing them as passive recipients of the labels supplied by perceivers. A two‐part study of college students with physical disabilities, including comments from a series of focused group interviews and open‐ended responses to a questionnaire with national distribution, resulted in the data presented. The data indicated that most of the students strived to appear as normative as possible through their clothing choices and accordingly used a variety of techniques: “making do” with ingeniously adapted ready‐to‐wear apparel; using clothes to conceal a disability; deflecting attention from a disability toward more normative but slightly discrediting attributes; compensation through fashionable dress or by emphasizing other social roles and abilities; and social inclusion, i.e., the assertion that all persons vary in physical appearance. Some students employed dress to take advantage of their social uniqueness through such techniques as wearing bright or prominent clothing or by displaying humor. Possible directions for future research on the social interactions of disabled persons, particularly involving the implications of normalizing appearance versus emphasizing social uniqueness, are presented.     

The cognitive and neural basis of option generation and subsequent choice

Decision-making research has thoroughly investigated how people choose from a set of externally provided options. However, in ill-structured real-world environments, possible options for action are not defined by the situation but have to be generated by the agent. Here, we apply behavioral analysis (Study 1) and functional magnetic resonance imaging (Study 2) to investigate option generation and subsequent choice. For this purpose, we employ a new experimental task that requires participants to generate options for simple real-world scenarios and to subsequently decide among the generated options. Correlational analysis with a cognitive test battery suggests that retrieval of options from long-term memory is a relevant process during option generation. The results of the fMRI study demonstrate that option generation in simple real-world scenarios recruits the anterior prefrontal cortex. Furthermore, we show that choice behavior and its neural correlates differ between self-generated and externally provided options. Specifically, choice between self-generated options is associated with stronger recruitment of the dorsal anterior cingulate cortex. This impact of option generation on subsequent choice underlines the need for an expanded model of decision making to accommodate choice between self-generated options.     

Book Reviews

Abstract

Kleinbeck, U., Quast, H.-H., Thierry, H., & Hacker, H. (1990). Work Motivation. Hillsdale, NJ: Lawrence Erlbaum Associates. Pp. 283.

Ketchum, L.D., & Trist, E.L. (1992). All teams are not created equal. Newbury Park, CA: Sage Publications. ISBN 0-8039-4652-X (cloth). 318 pp.     

Status legitimizing beliefs predict positivity toward Whites who claim anti-White bias

Although Whites are increasingly likely to perceive themselves as victims of racial bias, research provides little insight into how anti-White bias claimants are perceived. Two studies examined whether Whites' endorsement of status legitimizing beliefs (SLBs) moderates their reactions toward White discrimination claimants. In Study 1, Whites who rejected SLBs reacted less favorably to an anti-White bias claimant relative to one who made a nondiscriminatory external claim, whereas Whites who endorsed SLBs expressed equally positive attitudes toward an anti-White bias claimant and a non-claimant. In Study 2, Whites who were not primed with status legitimizing beliefs displayed negative reactions toward an anti-White bias claimant compared to a non-claimant, whereas those primed with SLBs expressed more positive attitudes and a desire to help the anti-White bias claimant. Implications for affirmative action litigation are discussed.     

The Campbell Paradigm as a Conceptual Alternative to the Expectation of Hypocrisy in Contemporary Attitude Research

Hypocrisy—professing a general attitude without implementing corresponding attitude-relevant behavior—is, according to Ajzen and Fishbein (2005), commonly found in attitude research that aims to explain individual behavior. We conducted two studies that adopted the Campbell paradigm, an alternative to the traditional understanding of attitudes. In a laboratory experiment, we found that specific attitude-relevant cooperation in a social dilemma was a function of people’s pre-existing general environmental attitude. In a quasi-experiment, we corroborated the reverse as well; engagement in attitude-relevant dietary practices was indicative of environmental attitude. When using Campbellian attitude measures, there is no room for hypocrisy: People put their general attitudes into specific attitude-relevant practices, and differences in people’s general attitudes can be derived from their attitude-relevant behavior.