Learning about environmental geometry: an associative model

K. Cheng (1986) suggested that learning the geometry of enclosing surfaces takes place in a geometric module blind to other spatial information. Failures to find blocking or overshadowing of geometry learning by features near a goal seem consistent with this view. The authors present an operant model in which learning spatial features competes with geometry learning, as in the Rescorla-Wagner model. Relative total associative strength of cues at a location determines choice of that location and thus the frequencies of reward paired with each cue. The model shows how competitive learning of local features and geometry can appear to result in potentiation, blocking, or independence, depending on enclosure shape and kind of features. The model reproduces numerous findings from dry arenas and water mazes.     

The role of cluster B and C personality disturbance in the course of depression: a prospective study

The association between personality disturbance and depression has been noted consistently. Prospective tests of personality's impact on the course of depression, however, are lacking. In a sample of 159 undergraduates who experienced at least one prospective depressive episode, dimensional scores for clusters B and C personality disturbance were examined as prospective predictors of four indicators of the course of depression: severity, episode duration, symptomatic chronicity and number of episodes. Cluster C personality disturbance, characterized by anxious and fearful features, predicted depression chronicity. Cluster B, characterized by dramatic, emotional and/or erratic features, predicted severity and duration of depression. The findings are discussed in terms of the possible mechanisms underlying the effects of clusters B and C, as well as implications for future research.     

Functional balance and dual-task reaction times in older adults are improved by virtual reality and biofeedback training.

Virtual reality (VR) training has been used successfully to rehabilitate functional balance and mobility in both traumatic brain injury (TBI) survivors and elderly subjects. Similarly, computer-based biofeedback (BF) training has resulted in decreased sway during quiet stance and decreased reaction times during a dual-task reaction time paradigm in elderly subjects. The objective of this study was to determine the effect of VR and BF training on balance and reaction time in older adults. Two groups of twelve healthy older adults completed 10-week training programs consisting of two 30-min sessions per week. VR training required that participants lean sideways to juggle a virtual ball. Participants in the BF group viewed a red dot representing their center of gravity on a screen and were required to move the dot to the four corners of the monitor. Measures of functional balance and mobility (Community Balance and Mobility Scale [CB&M]), sway during quiet stance, and reaction time during a dual task paradigm were recorded before training, as well as 1 week and 1 month after the end of the program. Both groups showed significant improvements on the CB&M, as well as decreased reaction times with training. Postural sway during quiet stance did not change significantly.     

Mothers' attachment status as determined by the Adult Attachment Interview predicts their 6-year-olds' reunion responses: a study conducted in Japan

Following a 1986 study reporting a predominance of ambivalent attachment among insecure Sapporo infants, the generalizability of attachment theory and methodologies to Japanese samples has been questioned. In this 2nd study of Sapporo mother-child dyads (N=43), the authors examined attachment distributions for both (a) child, based on M. Main and J. Cassidy's (1988) 6th-year reunion, and (b) adult, via the Adult Attachment Interview (AAI). In contrast to the previous Sapporo study, children's 3-way or "organized" distribution did not differ from the global distribution. However, when the disorganized-controlling (D) and cannot classify (CC) categories were applied to the analyses, a high proportion of D/CC children was found. Comparable analyses for Japanese mothers, including the unresolved/disorganized (U) and CC categories, were found to deviate slightly from the global norm. However, turning from global distributions to mothers' AAI classification as related to their child's reunion classification, all matches were surprisingly close to those established worldwide. When, as is customary, mothers' U and CC classifications were combined (U/CC) and compared with the child's D and CC classifications (also customarily combined as D/CC), mothers' U/CC status strongly predicted child D/CC status (r=.60, d=1.50). Additionally, mothers' AAI subclassifications predicted child subclassifications.     

Influence and adjustment goals: sources of cultural differences in ideal affect

Previous studies have found that in American culture high-arousal positive states (HAP) such as excitement are valued more and low-arousal positive states (LAP) such as calm are valued less than they are in Chinese culture. What specific factors account for these differences? The authors predicted that when people and cultures aimed to influence others (i.e., assert personal needs and change others' behaviors to meet those needs), they would value HAP more and LAP less than when they aimed to adjust to others (i.e., suppress personal needs and change their own behaviors to meet others' needs). They test these predictions in 1 survey and 3 experimental studies. The findings suggest that within and across American and Chinese contexts, differences in ideal affect are due to specific interpersonal goals.