Principles of cross-modal competition: Evidence from deficits of attention

How does the attentional system coordinate the processing of stimuli presented simultaneously to different sensory modalities? We investigated this question with individuals with neurological damage who suffered from deficits of attention. In these individuals, we examined how the processing of tactile stimuli is affected by the simultaneous presentation of visual or auditory stimuli. The investigation demonstrated that two stimuli from different modalities are in competition when attention is directed to the perceptual attributes of both, but not when attention is directed to the perceptual attributes of one and the semantic attributes of the other. These findings reveal a differentiated attentional system in which competition is modulated by the level of stimulus representation to which attention is directed.     

On the (non)categorical perception of lexical tones

Identification and discrimination of lexical tones in Cantonese were compared in the context of a traditional categorical perception paradigm. Three lexical tone continua were used: one ranging from low level to high level, one from high rising to high level, and one from low falling to high rising. Identification data showed steep slopes at category boundaries, suggesting that lexical tones are perceived categorically. In contrast, discrimination curves generally showed much weaker evidence for categorical perception. Subsequent investigation showed that the presence of a tonal context played a strong role in the identification of target tones and less of a role in discrimination. The results are consistent with the hypothesis that tonal category boundaries are determined by a combination of regions of natural auditory sensitivity and the influence of linguistic experience.     

Happiness and health: environmental and genetic contributions to the relationship between subjective well-being, perceived health, and somatic illness

The aim was to identify genetic and environmental influences on the covariances between subjective well-being (SWB), perceived health, and somatic illness. Analyses were based on 6576 Norwegian twins aged 18-31. Heritabilities ranged from .24 to.66. SWB correlated .50 with perceived health, -.25 with musculoskeletal pain, and -.07 with allergy. Common genetic factors accounted for 45%-60% of associations. SWB and perceived health was to a high extent influenced by the same genes (r(g)=.72 and.82 for males and females, respectively). For SWB and musculoskeletal pain, r-sub(g) =-.29 and -.42 for males and females, respectively. Effects were partly sex specific. Environmental factors shared by twins did not affect the covariances. Results support a differentiated view of SWB-health relations, and imply that both genes and environment play important roles in the associations between well-being and health.     

Effects of Paired and Unpaired Eye-Blink Conditioning on Purkinje Cell Morphology

This experiment addressed (1) the importance of conjunctive stimulus presentation for morphological plasticity of cerebellar Purkinje cells and inhibitory interneurons and (2) whether plasticity is restricted to the spiny branches of Purkinje cells, which receive parallel fiber input. These issues were investigated in naive rabbits and in rabbits that received paired or unpaired presentations of the conditioned stimulus (CS) and unconditioned stimulus (US). To direct CS input to the cerebellar cortex, pontine stimulation served as the CS. Air puffs to the cornea served as the US. Paired condition rabbits received pontine stimulation for 350 msec paired with a coterminating 100-msec air puff. Unpaired condition rabbits received the same stimuli in a pseudorandom order at 1- to 32-sec intervals. Rabbits were trained for a mean of 12 days. Naive rabbits received no treatment. In Golgi-stained Purkinje neurons in lobule HVI, total dendritic length, main branch length, total spiny branch length, and number of spiny branch arbors were all greater in the naive group than in the paired and unpaired groups, which did not differ. No differences were found between the hemispheres ipsilateral and contralateral to the trained eye. The dendritic length and number of branches for inhibitory interneurons did not differ across groups. The Purkinje cell morphological changes detected with these methods do not appear to be uniquely related to the conjunctive activation of the CS and US in the paired condition.     

Women's Descriptions of Drinking in Bars: Reasons and Risks

Fifty-two women bar drinkers participated infocus group discussions about women's reasons fordrinking, victimization experiences, and behaviors thatinfluence risk for victimization, in bars. The majority of the participants were White (67.3%),one-third were Black (30.8%), and one was NativeAmerican. Qualitative data analytic techniques were usedto assess the content of these discussions. Womendescribed distinct reasons for going to bars and providednumerous accounts of aggression they had witnessed orexperienced associated with this setting. Depictions ofphysical violence ranged from having an object thrown at them or being pushed, to accounts ofrape and attempted murder. These women also describedobservable changes in other women's behavior followingalcohol consumption, and how these behaviors increase risk for victimization in bars. The qualitativefindings are discussed in terms of what they tell usabout women bar drinkers and the insight theyprovide fordesigning future studies and interventions that focus on education and prevention.     

Evidence for the Continuity of Early Problem Behaviors: Application of a Developmental Model

Evidence of the continuity of early problem behaviors in young girls and boys was examined developmentally. Data were gathered on 104 mother-child dyads from low-income families when children were between 1 and 5 years of age. Difficult temperament, aggression, and noncompliance from 12 to 24 months, and externalizing and internalizing problems at 36 and 60 months, were assessed. The results provide evidence for the continuity of early behavioral and emotional problems and support for the early differentiation between internalizing and externalizing problems. Implications of the current findings for prevention efforts are presented.     

Dissociable Coordinate Frames of Unilateral Spatial Neglect: “Viewer-Centered” Neglect

Detailed analyses of reading and nonlexical tasks by three patients with unilateral spatial neglect (USN) secondary to stroke indicate that the USN in each of these patients affects the left side (contralateral to brain damage) of the viewer, with respect to the viewer's head, mid-sagittal plane of the body, or line of sight. In one case, the neglect was further specified as concerning the left side of the viewer's line of sight (the left half of her residual visual field). Thus, the frame of reference of USN in these three cases appears to have viewer-centered (in at least one case, specifically retinotopic) coordinates. The performance of these patients is contrasted to that of other patients in the literature whose USN appears to have a frame of reference with stimulus-centered or object-centered coordinates. These results are interpreted within a model of visual processing (adapted from Marr, 1980 and others) with at least three coordinate frames. It is argued that USN can affect one or more of these coordinate frames independently.     

Adaptive behavior of retarded,slow-learner,and average intelligence children

Scores on the WISC-R and the AAMD Adaptive Behavior Scale, Part I, Public School Version, were obtained for 94 elementary school children referred for psychological services in a southeastern rural area. Some of the adaptive behavior scores differentiated among children classified as EMR, slow-learners, or average intelligence. Some of the domain subscores of the ABS seem of questionable validity and reliability.     

Individualized learning environments: Intra- and interpersonal consequences

This study examines the effects of individual goal structures on the intra- and interpersonal behavior of 120 fourth-grade children. Each group of four children was introduced to one of two individualized learning programs: (a) workbook materials color-coded according to level of difficulty (allowing implicit comparisons among children as to progress), and (b) materials not coded according to difficulty (discouraging comparisons). In both learning programs, children worked individually (at story writing) and were rewarded for the work. Results indicate that boys, but not girls, who were rewarded equally for doing good work in an individualized setting but who start and end at a lower step than other more frequently took away a toy from those peers with whom they compared themselves than did boys who were rewarded equally for good work and where there were no comparisons. Boys as a group, regardles of condition, gave more prize tickets to themselves than to others and gave more prize tickets to themselves than girls gave either to themselves or others. Both boys and girls appear to adopt the evaluations of their work given by the experimenter and appear to be influenced thereby in later prized-giving to themselves and to others.     

Cognitive Slippage in Children Vulnerable to Schizophrenia

Psychological deficit research with adult schizophrenics has been hindered by numerous methodological problems that may be avoided by the prospective study of children vulnerable to the disorder. An object sorting task was administered to 156 children of schizophrenic patients, 102 children of depressed patients, and 139 children of normal parents. The children were between 6 and 15 years old. The children of schizophrenic parents made fewer superordinate sorting responses than those of normal parents, and more complex sorts (a category of inadequate responses) than children of either normal or depressed parents. Our analyses showed that these deficits could not be explained by differences in intelligence. These deficits in conceptual performance may reflect the genotypic predisposition to schizophrenia and/or represent an early precursor of later maladjustment.This research was supported by grant MH 21145 from the National Institutes of Mental Health and by funds from the William T. Grant Foundation. We would like to thank Linda Doll, Diane Liebert, and Jean C. Sullivan for testing the children, and Barbara Mosbacher and Rochelle Weinberger for scoring the protocols.