Crossed categorization in common ingroup contexts

In three experiments, the authors tested the hypothesis that a common ingroup context would moderate evaluations of crossed category targets. In Experiment 1, the typical additive pattern of evaluation across artificial crossed category groups became a social inclusion pattern in a common ingroup context. In Experiment 2, the authors manipulated the importance of real crossed category targets. When the crossed groups were of low importance, the effects of imposing a common ingroup replicated those observed in Experiment 1. For important crossed groups, however, the additive pattern remained. In Experiment 3, the authors measured perceived importance of the crossed groups to social identity prior to introducing a common ingroup context. The effects of a common categorization on evaluations were again moderated by perceived importance. These findings are discussed in the context of integrating crossed categorization and common ingroup identity models of multiple categorization.     

Synaesthesia: supernormal integration?

Synaesthesia has been known to scientific research for over 100 years but has undergone something of a renaissance recently as new investigations begin to uncover its neurological basis. Rather than being an anomaly, it might offer beneficial insights into the basis of normal perception. A new study by Esterman et al. epitomises this current trend and claims to show that the posterior parietal cortex is a crucial locus of synaesthetic experience. As the posterior parietal cortex is commonly linked to normal sensory integration, Esterman et al.'s finding might lend support to the claim that synaesthesia is an extension of the normal perceptual processes assumed to occur in binding.     

Objects are individuals but stuff doesn't count: perceived rigidity and cohesiveness influence infants' representations of small groups of discrete entities

Young infants construct models of the world composed of objects tracked through time and occlusion. To date little is known about the degree to which these models are sensitive to the material make-up of the represented individuals. Two experiments probed 8-month-olds' ability to represent different kinds of entities: rigid, cohesive objects, flexible, cohesive objects, and non-rigid, non-cohesive portions of sand. In Experiment 1, infants represented an array of two rigid, cohesive objects hidden behind a single screen, but failed to represent hidden arrays of two flexible objects or two portions of sand. In Experiment 2, entities were hidden behind two screens instead of one, thereby reducing the information processing demands of the task. In that case, infants succeeded in representing arrays of both types of object stimuli, but again failed to represent the portions of sand. It is argued that (1) the processes by which infants individuate and track entities are sensitive to material kind, (2) rigid cohesive objects occupy a privileged status in this system, and (3) early knowledge about objects and substances has a quantificational aspect.     

Spontaneous representation of number in cotton-top tamarins (Saguinus oedipus)

The "violation of expectancy" looking-time methodology has proven a powerful tool for exploring prelinguistic mental representations in human infants as well as in nonhuman primates. Four studies applying this methodology to the question of spontaneous number representations in cotton-top tamarins (Saguinus oedipus) are reported here. Monkeys were shown 1 + 1 events in which objects were placed behind a screen, 1 by 1. The screen was removed, revealing consistent (2 objects) and inconsistent (1, 3, or 1 large object twice the mass of original object) outcomes. In all studies, monkeys looked longer at the inconsistent than at the consistent outcome. When the monkeys view a 1 + 1 operation, they expect exactly 2 objects. It is likely that these numerical representations are spontaneously available to a variety of primate species and could provide a foundation on which humans' number sense was constructed over evolution and development.     

Use of the AUDIT and the DAST-10 to identify alcohol and drug use disorders among adults with a severe and persistent mental illness

State Psychiatric Hospital outpatients (93 men, 69 women) diagnosed with a serious persistent mental illness (SPMI) completed the Alcohol Use Disorders Identification Test (AUDIT) and Drug Abuse Screening Test (DAST-10) by interview as part of a general health/behavior screening instrument. Responses to the AUDIT and DAST-10 were compared with criteria of current diagnosis and occurrence of symptoms in the last year for both alcohol and drug use disorders, respectively. Results showed that for both diagnosis and symptoms, AUDIT cutpoints of 7 and 8 had good sensitivity and specificity, and DAST-10 cutpoint of 2 was identified for both criteria. These and other findings suggest that both instruments have promising clinical utility when used with individuals diagnosed with an SPMI.