A common oscillator for perceptual rivalries?

Perceptual rivalry is an oscillation of conscious experience that takes place despite univarying. if ambiguous, sensory input. Much current interest is focused on the controversy over the neural site of binocular rivalry, a variety of perceptual rivalry for which a number of different cortical regions have been implicated. Debate continues over the relative role of higher levels of processing compared with primary visual cortex and the suggestion that different forms of rivalry involve different cortical areas. Here we show that the temporal pattern of disappearance and reappearance in motion-induced blindness (MIB) (Bonneh et al, 2001 Nature 411 798-801) is highly correlated with the pattern of oscillation reported during binocular rivalry in the same individual. This correlation holds over a wide range of inter-individual variation. Temporal similarity in the two phenomena was strikingly confirmed by the effects of the hallucinogen LSD, which produced the same, extraordinary, pattern of increased rhythmicity in both kinds of perceptual oscillation. Furthermore. MIB demonstrates the two properties previously considered characteristic of binocular rivalry. Namely the distribution of dominance periods can be approximated by a gamma distribution and, in line with Levelt's second proposition of binocular rivalry, predominance of one perceptual phase can be increased through a reduction in the predominance time of the opposing phase. We conclude that (i) MIB is a form of perceptual rivalry, and (ii) there may be a common oscillator responsible for timing aspects of all forms of perceptual rivalry.     

An information-processing model of the BOLD response in symbol manipulation tasks

Two imaging experiments were performed—one involving an algebraic transformation task studied by Anderson, Reder, and Lebiere (1996) and the other an abstraction symbol manipulation task studied by Blessing and Anderson (1996). ACT-R models exist that predict the latency patterns in these tasks. These models require activity in an imaginal buffer to represent changes to the problem representation, in a retrieval buffer to hold information from declarative memory, and in a manual buffer to hold information about motor behavior. A general theory is described about how to map activity in these buffers onto the fMRI blood oxygen level dependent (BOLD) response. This theory claims that the BOLD response is integrated over the duration that a buffer is active and can be used to predict the observed BOLD function. Activity in the imaginal buffer is shown to predict the BOLD response in a left posterior parietal region; activity in the retrieval buffer is shown to predict the BOLD response in a left prefrontal region; and activity in the manual buffer is shown to predict activity in a motor region. More generally, this article shows how to map a large class of information-processing theories (not just ACT-R) onto the BOLD response and provides a precise interpretation of the cognitive significance of the BOLD response.     

Reductions in criminality subsequent to group, individual, and family therapy in adolescent residential and day treatment settings.

The complete population of adolescents in a residential and day-treatment program over a 4-year period, 532 youths, served in two studies. Along with residential and day-treatment settings, predictive variables of interest were the number of hours spent in group, individual, and family therapy. A total of 227 adolescents qualified for Study 1 which found a reduction of rates of criminal charges from pre- to posttreatment. Study 1 also found that hours in group therapy explained the most variance in the reduction in rates of criminal charges, followed closely by hours in individual therapy. Hours in family therapy was not a significant predictor. A total of 430 adolescents qualified for Study 2, which found that residential treatment was associated with greater reductions in adult correctional commitments than day treatment. Implications stress the need for further research examining the relationships between therapeutic components of residential treatment and behavioral outcomes.     

Psychoeducation and managed care: Clinical issues for the 1990s

Managed care has challenged mental health professionals to develop more efficient ways of addressing patient care needs. Psychoeducational programs, for patients and their families, have emerged as a medium by which relevant education and mutual support can be provided to participants. A review of the literature, a comprehensive model of psychoeducation, and the advantages of such models within the managed care program are offered. Also addressed are issues and import, treatment and research considerations.     

Validity of the Sex-Role Egalitarianism Scale: Two replication studies

To enhance the construct validity of the Sex-Role Egalitarianism Scale (SRES), two replications of earlier validity studies were undertaken. Samples were from several college campuses and primarily Caucasian. In Study 1, multiple regression analyses confirmed a hypothesized curvilinear relationship between scores on the SRES and scores on the MacDonald Sex Role Survey, a measure of gender role ideology regarding women. In Study 2, the expectation that SRES would share a relatively small amount of total variance with both the Femininity/Expressiveness and Masculinity/Instrumentality trait subscales of the Personal Attributes Questionnaire was supported. Both sets of results are consistent with earlier validity research using different measures.Lynda King would like to express her appreciation to the Central Michigan University Research Professorship Award program for its support of the studies reported here. The authors would also like to thank the anonymous reviewers for their thoughtful guidance and suggestions. A previous version of this paper was presented at the annual meeting of the American Psychological Association, Washington, DC, August 1992.