Processing demands during mental operations

Man possesses a central system of limited capacity. Theorists at first described this system as a single limited capacity channel Two current theoretical alternatives to single-channel theory are (1) the undifferentiated capacity hypothesis that man possesses a pool of capacity units so that interference occurs oniy if the total number of capacity units that mental operations demand exceeds the system limit and (2) the hypothesis that some, but not all, mental operations require space in a limited capacity central mechanism and that any operation that requires space will interfere with any other operation that also demands space. Time on task fails as a sensitive measure of capacity demands because some task components require time but not full processing capacity. The secondary task technique uses the interference between a primary task and a secondary task to assess the extent to which the primary task makes processing demands on the central limited system. Processing demands have been measured for five categories of mental operation: (1) encoding, (2) multiple input, (3) rehearsal, (4) transformation, and (5) responding.     

Visual resolution in the periphery

Visual acuity thresholds were determined for two Os with a 3-deg square grating target presented for 0.2 sec within a steadily illuminated surround field matched in luminance to the test field. Measurements were made in the fovea, and at 10, 20, and 30 deg along the horizontal meridian of the temporal retina, at luminances between ?3.5 and 3.0 log mL. The foveal acuity-luminance functions showed a large increase in acuity up to 1 or 2 log mL, but at peripheral locations very little increase occurred above 0 log mL. The maximum acuity reached at photopic luminances dropped sharply with increasing eccentricity. Visual acuities were two to four times higher than those previously reported for the periphery; methodological and target differences are presented to account for this result.     

Effects of telic dominance and metamotivational state on squash task performance

Measures of telic dominance and metamotivational state were obtained from 40 volunteer males grouped on the basis of their playing ability, before and after the performance of squash tasks. Utilising a mixed-blocks design, which controlled for order of task, subjects were required to perform two squash tasks of differing difficulty. Significant differences between groups on performance were obtained, confirming the ability classification, but no significant differences in telic dominance were found. Significant increases in mood response in the telic direction were found on pre- and posttask scores. A significant decrease in discrepancy scores (preferred arousal minus felt arousal) obtained pre- and posttask was noted, together with a significant interaction between skill level and in arousal discrepancy pre- and posttask. In all cases trends were least for the most skilled group.     

Sequential predictability effects on initiation time and movement time for adults and children

First-grade children and adults performed a two-choice initiation-time/ movement-time task in which signals were (a) more likely to repeat than alternate, (b) more likely to alternate than repeat or (c) equally likely to alternate or repeat. Sequential predictability influenced initiation time but not movement time for adults and for children. These results do not support the suggestion (Wickens, 1974) that sequential predictability affects initiation time and movement time for children but only initiation time for adults. Adults and first graders did differ in their response to repeated events. Adults averaged faster initiation time for alternated than repeated responses and children averaged faster initiation time for repeated than alternated responses.     

Situational and personality determinants of a victim's identification with a tormentor

The effects of two situational (tormentor legitimacy and tormentor justification) and two personality (victim's belief in the just world and victim's Machiavellianism) factors on several reactions of a victim to his tormentor were explored. Greater conformity by victims to their tormentor's opinions occurred when the victims believed strongly in the just world and when the tormentor was well justified for his behavior; there was a greater conformity towards the tormentor in these conditions than towards a neutral nontormentor. The tormentor received less positive evaluations from the victim when he acquired his role illegitimately or when the victim was Machiavellian; when the tormentor acquired the role legitimately, he was liked no less than the nontormentor. The experimental variables did not affect behavioral imitation of the tormentor or the interpersonal distance maintained by the victim. The results failed to conform to any simple identification process. Several explanations for these results are explored and directions for additional research are discussed.     

Children's use of sequence information in partially predictable reaction-time sequences

Second-, fourth-, and sixth-grade children and adults performed a four-choice reaction time task with partially predictable sequences and 250-, 500-, and 750-msec response-to-stimulus intervals. The relative advantage for in-sequence as opposed to out-of-sequence events was independent of the response-to-stimulus interval for all ages. Children, but not adults, were slower for nonrepeated than repeated out-of sequence events and this advantage for repeated signals decreased as age increased. A second experiment extended the range of intervals tested to zero. Second graders and adults responded to four-choice partially predictable sequences with 0-, 250-, and 500-msec response-to-stimulus intervals. As in the first experiment, the difference between in-sequence and out-of-sequence events did not vary with the response-to-stimulus interval. The results suggest that both children and adults are able to process advance sequence probability information about a subsequent event in parallel with an ongoing response.     

Applicability of the Somatomorphic Matrix computer program in Japanese and Australian Caucasian males in relation to measured body composition

The Somatomorphic Matrix (SM) is a computer-based body image assessment program that allows assessment of the individual's body image in relation to known body composition values. To date, no study has compared the SM results to the measured body composition and assessed the usefulness in multi-ethnic samples. Japanese and Australian Caucasian males underwent testing to examine the SM body image results to their measured body composition. Japanese males showed significant (p < 0.01) discrepancy in their measured and the perceived ‘current’ muscularity compared with Australians. Both groups showed wide variability in the perception of their ‘current’ body composition in relation to the measured values, indicating an incomparability of the SM results to the measured results. The study also showed Japanese males to have lower consistency in the SM results than Australian males after a 12-month interval. In order to use the program in multi-ethnic populations further development of the program is recommended.     

Psychosocial correlates of dating violence victimization among Latino youth

To examine the association between physical dating violence victimization and risk and protective factors, an anonymous, cross-sectional, self-reported survey was administered to Latino youth (n=446) residing in suburban Washington, DC. Multivariate logistic regression models were constructed, and adjusted OR and 95% CI were examined. Approximately 9% of Latino adolescents reported physical dating violence victimization. Overall, youth who reported carrying a gun, involvement in physical fights and suicidal thoughts were at greater odds of reporting dating violence. Among females, fighting was the sole risk behavior associated with dating violence. Girls who reported a stronger sense of self were less likely to report dating violence. Among males, gun carrying, but not physical fighting, and having considered suicide were associated with dating violence. Spending time each week with a mentor was also positively associated with male dating violence victimization. Dating violence appeared to cluster with other risk behavior engagement. Important gender differences in associated risk and protective behaviors were identified and should be incorporated into primary and secondary prevention activities.     

Maternal depression, adult attachment, and children's emotional distress

INTRODUCTION: Our goal was to evaluate the impact of depressed mothers' marital intimacy and attachment security in romantic relationships on children's internalizing and externalizing symptoms. METHOD: Forty-six clinically depressed mothers rated attachment security, marital intimacy, and symptoms shown by their children aged 8 to 12. RESULTS: Maternal avoidance of closeness predicted increases in children's internalizing symptoms over a 6-month period. DISCUSSION: Avoidance of closeness in depressed mothers may be implicated in the development of internalizing symptoms in their children, possibly because individuals who are avoidant of closeness are poor caregivers.