Effects of repetition and response deadline on associative recognition in young and older adults

The present study examined the joint effects of repetition and response deadline on associative recognition in older adults. Young and older adults studied lists of unrelated word pairs, half presented once (weak pairs) and half presented four times (strong pairs). Test lists contained old (intact) pairs, pairs consisting of old words that had been studied with other partners (rearranged lures), and unstudied pairs (new lures), and participants were asked to respond "old" only to intact pairs. In Experiment 1, participants were tested with both short and long deadlines. In Experiment 2, the tests were unpaced. In both experiments, repetition increased hit rates for young and older adults. Young adults tested with a long deadline showed reduced (Experiment 1) or invariant (Experiment 2) false alarms to rearranged lures when word pairs were studied more often. Young adults tested with a short deadline and older adults tested under all conditions had increased false alarm rates forstrong rearranged pairs. Implications of these results for theories of associative recognition and cognitive aging are explored.     

Redintegration and lexicality effects in children: Do they depend upon the demands of the memory task?

The effect of long-term knowledge upon performance in short-term memory tasks was examined for children from 5 to 10 years of age. The emergence of a lexicality effect, in which familiar words were recalled more accurately than unfamiliar words, was found to depend upon the nature of the memory task. Lexicality effects were interpreted as reflecting the use of redintegration, or reconstruction processes, in short-term memory. Redintegration increased with age for tasks requiring spoken item recall and decreased with age when position information but not naming was required. In a second experiment, redintegration was found in a recognition task when some of the foils rhymed with the target. Older children were able to profit from a rhyming foil, whereas younger children were confused by it, suggesting that the older children make use of sublexical phonological information in reconstructing the target. It was proposed that redintegrative processes in their mature form support the reconstruction of detailed phonological knowledge of words.     

Similarity as transformation

We propose that similarity is determined by the transformation distance between representations: entities which are perceived to be similar have representations which are readily transformed into one another, whereas transforming between dissimilar entities requires many transformations. We present three experiments that indicate that similarity is strongly influenced by transformation distance. These data present a challenge for featural or spatial accounts of similarity. Finally, we introduce a family of transformation-based accounts of similarity, called 'Representational Distortion', as a specific example of a transformational approach to similarity.     

Using auditory streaming to reduce disruption to serial memory by extraneous auditory warnings

Three experiments were conducted to examine the effects of extraneous speech warnings (i.e., low-priority warnings initiated during high-priority tasks) on cognitive performance and whether organizing the auditory warnings into streams can attenuate any disruption. Experiment 1 demonstrated that a variety of speech warnings can be separated into perceptually distinct streams by allocating them to discrete spatial locations. Experiment 2 showed that increasing the rate of presentation of the warnings to promote streaming decreased clarity ratings but increased perceived urgency ratings. Experiment 3 demonstrated that the disruption to serial memory for navigational information by extraneous speech warnings could be attenuated by streaming. Results are interpreted in light of previous research, and practical implications for auditory warning design are discussed.     

Suicide ideation and its relationship to depressed mood in a community sample of adolescents in Hong Kong.

A sample of 996 Chinese adolescents in Hong Kong provided information about their suicide ideation. Their depressive symptoms were measured by the Chinese Beck Depression Inventory (C-BDI), and a broad range of stressors were also assessed as potential predictors to level of suicide ideation. The stressors and C-BDI scores predicted 33% of the variance in suicide ideation. In boys, most of the prediction was attributable to C-BDI scores, suggesting that depression mediated the effects of stressors. In girls, C-BDI scores, perceptions of low parental caring, and high conflict with parents had additive effects in predicting level of suicide ideation. This study contributes needed information about a non-Western population and highlights gender differences.     

Social comparison, individualism-collectivism, and self-esteem in china and the United States

Possible differences in social comparison choices between individualistic and collectivistic cultures and individuals were explored among a sample of 235 student participants from the United States and China, focusing on self-esteem as a possible mediating variable. A self-report social comparison measure was developed and factor analyzed. Correlations revealed that higher collectivism scores were associated with an increased desire to compare in general, an increased desire to make upward comparisons, and a decreased desire to make downward comparisons. It is speculated that upward self-improvement comparisons for the sake of the group may be more common for those high in collectivism.     

Pattern of Neuropsychological Deficit at Age Five Years Following Neonatal Unilateral Brain Injury

The pattern of language deficit following left-hemisphere brain injury and visual/spatial deficit following right-hemisphere injury in an adult or older child is well recognized, but has been inconsistently reported following presumed neonatal brain injury. Our prospective study of 24 children at age 5 with documented neonatal unilateral brain injury lends support to the theory of hemisphere specialization at the time of birth. Twelve children who had unilateral left-hemisphere lesion were compared to 12 children with unilateral right-hemisphere lesion of similar timing and severity. Relative visual/spatial deficit following right-hemisphere lesion and receptive language deficit following left-hemisphere lesion were identified. Lateralized measures of grip strength, fine motor speed, and fine motor dexterity were not significantly different between the groups for either hand in this nonhemiparetic study sample. Only one child with a left-hemisphere lesion was left-handed, and only one child (right-lesion) had a hemiparesis.     

Vietnamese Amerasians: Predictors of Distress and Self-Destructive Behavior

There have been few empirical studies of Vietnamese Amerasians, children fathered by United States servicemen and civilians during the Vietnam War. In this study, the authors investigated pre- and postmigration variables that predict psychological distress and self-destructive behavior. The sample (N = 169) was selected from 10 cities throughout the United States. Multivariate regression analyses were used to determine the predictors of distress. Results revealed that observing traumatic events rather than actually experiencing trauma was a significant predictor of psychological distress. Participants with frequent cognitions about loss of significant people, places, or both were more likely to report psychological distress and self-destructive behavior. Implications for research and practice are discussed in relationship to cross-cultural counseling with at-risk populations, including individuals from inner cities and war-stricken environments.     

Changing social stereotypes: The case of the information seeker

Previous research has shown that stereotype-based judgements can be attenuated through the attribution of disconfirming information to individual group members. Typically in these studies, subjects are forced to process all the available in formation, including disconfirming information, before providing their impressions of the group. In the reported research, in contrast, we attempted to create a more naturalistic paradigm by allowing subjects to control the amount and nature of information they received about individual group members. Under these conditions, we expected subjects to instigate a biased information-seeking strategy and display a preference for stereotype-matching rather than stereotype-mismatching information. Our results supported this prediction. When subjects could control the nature and amount of information they received about a target group they showed: (i) a preference for stereotype-matching information and (ii) no change in their stereotypic impressions of the group. When, however, subjects were forced to process all the available information, their stereotypic evaluation of the group diminished. These findings demonstrate the general resistance of stereotypes to change in naturalistic, information-seeking settings.