Stimulus-Specific Delay Activity in Human Primary Visual Cortex

ABSTRACT— Working memory (WM) involves maintaining information in an on-line state. One emerging view is that information in WM is maintained via sensory recruitment , such that information is stored via sustained activity in the sensory areas that encode the to-be-remembered information. Using functional magnetic resonance imaging, we observed that key sensory regions such as primary visual cortex (V1) showed little evidence of sustained increases in mean activation during a WM delay period, though such amplitude increases have typically been used to determine whether a region is involved in on-line maintenance. However, a multivoxel pattern analysis of delay-period activity revealed a sustained pattern of activation in V1 that represented only the intentionally stored feature of a multifeature object. Moreover, the pattern of delay activity was qualitatively similar to that observed during the discrimination of sensory stimuli, suggesting that WM representations in V1 are reasonable "copies" of those evoked during pure sensory processing.     

Cradling side preference is associated with lateralized processing of baby facial expressions in females

Women’s cradling side preference has been related to contralateral hemispheric specialization of processing emotional signals; but not of processing baby’s facial expression. Therefore, 46 nulliparous female volunteers were characterized as left or non-left holders (HG) during a doll holding task. During a signal detection task they were then asked to detect the emotional baby faces in a series of baby portraits with neutral and emotional facial expressions, presented either to the left or the right visual field (VFP). ANOVA revealed a significant HG × VFP interaction on response bias data (p < .05). Response bias was lowest when emotional baby faces were presented in the visual field of cradling side preference, suggesting that women’s cradling side preference may have evolved to save cognitive resources during monitoring emotional baby face signals.     

Facilitation of a Distributed Shuttle-Box Conditioning with Posttraining Intracranial Self-Stimulation in Old Rats

Old Wistar rats (16–17 months) were trained in a two-way active avoidance task for 5 consecutive days (10 trials/day). Immediately after each training session a lateral hypothalamic intracranial self-stimulation session (ICSS group) or a sham-treatment session (Control group) was given to the animals. Long-term retention was tested 7 days after the last acquisition session. ICSS treatment led to a significant improvement in acquisition. In the long-term retention session the level of avoidance in both groups was similar to that achieved in the last acquisition session, although differences among groups failed to reach statistical significance. These results are compared with those obtained in previous experiments with young adult rats. While ICSS facilitated the process of acquisition in both young and old rats (however, it was much more powerful in young animals), further experiments are needed to elucidate whether this effect is long-lasting in old rats, as occurs in young adult subjects.     

Coping with failure: relationship with self-concept discrepancy and attributional style

In the relationship of attributional style and self-concept discrepancy with coping behavior among 10th-grade Hong Kong Chinese students, 3 significant canonical variate pairs were identified. The total criterion redundancy showed that self-concept discrepancy and attributional style predicted about 20% of the variance of coping behavior. The 1st variate pair indicated that students with small self-concept discrepancy and low-depressive attributional style tended to cope with failure by planful problem solving and by positive reappraisal. The 2nd variate pair showed that students, particularly girls, with small self-concept discrepancy in verbal ability and same-sex peer relations tended to cope with failure by seeking social support. The last variate pair showed that students with great self-concept discrepancy in same-sex peer relations and parent relations tended to cope with failure by avoiding or escaping. The 3 canonical variate pairs also suggested a new taxonomy for coping behavior: mobilization of internal coping resources, mobilization of external coping resources, and the inability to mobilize any coping resources.     

The acceptance of lonely others: effects of loneliness and gender of the target person and loneliness of the perceiver

The reactions of lonely people toward other lonely people and the relationship between loneliness and self-concepts were examined. The 2-way and 3-way interaction effects showed that low lonely perceivers reacted more negatively toward the lonely target person. The relationship between loneliness and self-concept was examined using a multidimensional measure of self-concept. Results showed that loneliness correlated negatively with self-concept. In multiple regression analyses, the most significant predictors of loneliness were self-concept of relations with same gender and opposite gender peers and general self-concept.     

Induction of intellectual gains in blind children

Twenty blind children (5–10 years old) were taught the concept of seriation by a learning set procedure. Ten of the children were also taught a simple classification concept to see if developing both abilities would produce more general intellectual gains. Children in a control group had training sessions matched in timing and extent, but differing in content. The results indicate that mastery of the concepts of seriation and classification can be accelerated through training. Training also affected WISC and SIT IQ scores; for these measurements, the seriation-classification group showed the greatest increase. Training had no effect on measures of psychological and social adjustment. The findings suggest that learning set training of Piagetian concepts can be effective in overcoming some conceptual deficiencies found in blind children. It may be profitable to test similar procedures with other children who are biologically mature but lagging in conceptual development.     

THE EFFECT OF CULTURE AND GENDER ON SELF-REPORTED ASSERTIVE BEHAVIOR

The purpose of the present study was to investigate the relationship between cultural affiliation, gender and assertive behavior in two distinct socio-cultural groups. Ninety-seven Israeli Arab students and 97 Israeli Jewish students, of both sexes, filled out the Assertion Inventory (Gambrill and Richey 1975) during a class meeting. Analysis of the results indicated differences between the two cultural groups. In general, Arab participants showed a lower level of assertiveness than their Jewish counterparts. Differences between gender and interaction of culture x gender were found in certain factors related to behavior in specific social situations. These findings were discussed on the basis of accepted social behavior within various cultural contexts.     

Individual differences in the linguistic competence of referential and expressive subjects

The aim of this work was to examine individual differences in referential and expressive style through a longitudinal study. The composition of the first 50 words, communicative gestures, the conversational style of dyads and the percentage of vocabulary produced from 12 to 24 month-olds were analyzed. The vocabulary was collected through interviews to parents and sessions of mother-infant interaction in the laboratory. Significant differences in the proportion of common nouns and frozen phrases between referential and expressive children in the frequency of communicative gestures and style conversation were found. Thus, referential children and their mothers used more pointing gestures than the expressive children and their mothers. Additionally, mothers of referential children used completing more frequently.     

Testing of an orthogonal measure of cultural identification with adult mission Indians

The Orthogonal Cultural Identification Scale (OCIS; Oetting & Beauvais, 1990-91) has been validated among Native American youth, but not adults. The present study sought to test the reliability (internal consistency) and validity (construct and factorial) of the OCIS among an adult Native American sample consisting of 389 Mission Indians (61% female). Participants were recruited from reservations using a venue sampling strategy. The OCIS was completed as part of a self-assessment packet of questionnaires. Internal consistency for OCIS subscale scores ranged from 0.76 to 0.91. Both concurrent and discriminant validity were demonstrated. Confirmatory factor analysis revealed 2 factors: (1) Anglo American Identification and (2) Native American Identification. These results indicate the OCIS is a reliable and valid instrument for use with adult Native Americans.     

Development of Component Skills in Reading Chinese

Development of three component skills in reading Chinese was examined in primary school children in Hong Kong. Feature analysis skills, syntax knowledge, and semantic analysis skills were found to differ in their contribution to reading proficiency at different grades. Visual processing skill was not at all a good predictor for reading proficiency, but the phonological access skill was important in predicting children's reading proficiency before grade three. It was an ineffective predictor beyond grade three. Skill in semantic analysis, on the other hand, was insignificant as a predictor at younger grades but it became an important predictor after grade two. Syntax knowledge was an important predictor of reading proficiency in the first grade and remained a significant predictor of reading proficiency right up to grade six. The present data support the idea that some preliminary component processes of reading may become automatic with increasing experience in reading and that this automatization of component processes will leave more resource capacity for higher-order analyses. Chinese reading shares much in common with English reading in terms of the component processes involved at different stages of reading proficiency.