The effect of warnings on false memories in young and older adults

In the present experiments, we examined adult age differences in the ability to suppress false memories, using the Deese-Roediger-McDermott (DRM) paradigm (Deese, 1959; Roediger & McDermott, 1995). Participants studied lists of words (e.g., bed, rest, awake, etc.), each related to a nonpresented critical lure word (e.g., sleep). Typically, recognition tests reveal false alarms to critical lures at rates comparable to those for hits for studied words. In two experiments, separate groups of young and older adults were unwarned about the false memory effect, warned before studying the lists, or warned after study and before test. Lists were presented at either a slow rate (4 sec/word) or a faster rate (2 sec/word). Young adults were better able to discriminate between studied words and critical lures when warned about the DRM effect either before study or after study but before retrieval, and their performance improved with a slower presentation rate. Older adults were able to discriminate between studied words and critical lures when given warnings before study, but not when given warnings after study but before retrieval. Performance on a working memory capacity measure predicted false recognition following study and retrieval warnings. The results suggest that effective use of warnings to reduce false memories is contingent on the quality and type of encoded information, as well as on whether that information is accessed at retrieval. Furthermore, discriminating between similar sources of activation is dependent on working memory capacity, which declines with advancing age.     

Media influences on body image and disordered eating among indigenous adolescent Australians

There has been no previous investigation of body image concerns and body change strategies among indigenous Australians. This study was designed to investigate the level of body satisfaction, body change strategies, and perceived media messages about body change strategies among 50 indigenous (25 males, 25 females) and 50 non-indigenous (25 males, 25 females) Australian adolescents (mean age 14.05, SD = 1.05). Consistent with past studies, girls were more likely to be dissatisfied with their weight and engage in strategies to lose weight. However, contrary to expectations, indigenous adolescents engaged in more strategies to lose weight, increase weight, and increase muscles than did non-indigenous adolescents, despite perceiving fewer media messages about losing weight. Additional factors that may explain the findings and the need for further research with different cultural groups are highlighted.     

Effect of distraction and coping style on in vivo exposure for specific phobia of spiders

Recent studies have generated mixed findings regarding the effects of distraction on exposure-based treatments. Results have also been inconsistent regarding the effects of monitoring and blunting coping styles on outcome. The present study attempted to integrate these two areas of research. We hypothesized that the effect of distraction on treatment outcome might depend on coping style. Specifically, we predicted that for blunters (i.e.. individuals who tend to avoid threat-related information), distraction would interfere with the effects of exposure. However, we predicted that distraction might benefit monitors (i.e., individuals who tend to seek out threat-related information). Sixty individuals with a specific phobia of spiders underwent a single, two-hour session of exposure treatment. During the first hour, half of the participants were distracted by listening to an audiotape and the other half underwent exposure without distraction. In the second hour, all participants underwent focused exposure. Based on measures of heart rate, subjective fear, and behavioral testing, participants improved after one hour of treatment, and improved further during the second hour. However, neither distraction, coping style, nor their interaction had a significant effect on outcome. The present study provides support for the benefits of behavioral treatment for specific phobias. However, our hypotheses regarding distraction and coping style were not confirmed.     

The structure ofAND coordinations in children's narratives

Narratives of 3 1/2-to 9 1/2-year-old children were searched for AND coordinations. Only half of the AND utterances of the youngest compared to four-fifths of those of the oldest children were fully formed, syntactically correct coordinations. The latter were classified as phrasal coordinations, redundant sententials (i.e., potential phrasals), or nonredundant sentential coordinations. Sentential coordinations predominated, especially among older children. Direction of redundancy (or potential redundancy) was important: forward forms predominated over backward forms. Differences in form of the children's coordinations often reflected differences in meaning; this was true for backward direction forms of phrasal versus sentential coordination, although not for most forward direction forms.The authors would like to thank Michael Bruce-Lockhart for the development and use of the NARRAN software package. For more information about NARRAN or its availability, write to the first author. This research was supported by National Science and Engineering Research Council grant A-0513 to the first author.     

Understanding “because”: How important is the task?

The causal connective because requires the order of clauses within a sentence to violate the order of events in the real world; i.e., effect because cause is correct. Children's (4, 6, and 8 years of age) ability to comprehend because was explored in a series of four studies. The first, a replication with variations of existing studies, assessed children's ability to judge as anomalous sentences in which the order of clauses is reversed. Comprehension of impersonal sentences is better than of sentences derived from narratives of their own experiences, although children do poorly at this task until age 8. However, results of study 2 suggest that children's poor understanding of task requirements is partly responsible, since increased task instructions and modeling led to significant improvement in the ability of preschoolers to judge sentences as anomalous. In the third study, children named the cause event after being told a causal sequence (involving either psychological or physical causality) of the form: Event A, Event C (effect) because Event B (cause), Event D. Comprehension of physical causality sequences is superior, but again, only 8-year-olds showed good performance. In Study 4, children were asked to find the cause event in four-clause sequences of the same form as in Study 3, but memory props were added in the form of pictures of events A, B, and D. Near perfect performance was shown by all children. Overall, comprehension studies of because are judged to be rife with methodological problems, and memory demands are seen to be particularly important.The authors wish to thank Lynn Anne Pye for her contributions to Study 4, which formed part of her undergraduate honors degree research, as well as F. Michael Rabinowitz for his comments and statistical aid. This research was supported by NSERC grant A7911 to the senior author.     

Factorial validity of the Bulimia Test-Revised in adolescent boys and girls.

The present study examined the psychometric properties and principal components structure of the Bulimia Test Revised (BULIT-R; [Thelen, M.H., Farmer, J., Wonderlich, S. & Smith, M. (1991). A revision of the Bulimia Test: the BULIT-R. Psychological Assessment, 3, 119-124.]) using a sample of early adolescent males and females. Three hundred and six girls (mean age = 13.66; S.D. = 1.12) and 297 boys (mean age = 13.89: S.D. = 1.13) from grades 7-10 completed the BULIT-R as part of a larger study investigating disordered eating in early adolescence. In comparison to the 5 factors identified in adult female samples, the factor analysis identified four similar factors for adolescent boys and girls: bingeing, control, normative weight loss (dieting and exercise) and extreme weight loss behaviors (vomiting, diuretics and laxatives). The findings highlight similarities between boys and girls and differences in the factorial nature of the BULIT-R for adult and adolescent samples. The BULIT-R also demonstrated good reliability with adolescent samples and adequate concurrent validity with the DFT, DEBQ and binge eating as defined by the DSM-IV criteria. The emergence of bingeing and control as two distinct factors is an important distinction that needs to be considered when attempting to provide accurate incidence rates of binge eating and bulimic symptomatology in adolescents.     

The parameter preferences of acquired motor programs for rapid,discrete movements: I. Transfer of training

Sixty subjects made discrete movements to visual targets without concurrent visual feedback. After 160 acquisition trials with a single target/movement, subjects were divided into five groups for transfer. The major independent variable was the relationship between the acquisition and transfer movements. For three groups, extent, duration, or velocity was the same in acquisition and in transfer, with the other two parameters changing. For the remaining two groups, either all parameters were changed or no parameters were changed (i.e., subjects performed the same movement). It was found that, as long as one parameter remained the same, subjects performed as well as if nothing were changed. Only when all parameters were changed did performance deteriorate. The results are in direct contrast to those of Newell and Zelaznik (1980) and provide no support for their conclusion that velocity is a more important parameter than movement duration or extent.     

Memory for locations within regions: Spatial biases and visual hemifield differences

Memory for location of a dot inside a circle was investigated with the circle in the center of a computer screen (Experiment 1) or with the circle presented in either the left or the right visual field (Experiment 2). In both experiments, as in Huttenlocher, Hedges, and Duncan’s (1991) study, the task was to relocate the dot by marking the remembered location. When errors in angular and radial estimates were considered separately, it was found that, in both experiments, the angular locations of estimates of the dots’ positions regressed toward different locations inside each quadrant of the circle; the radial locations of the estimates of dots’ positions tended to regress toward locations near the circumference. These variations in the direction of bias appeared to reflect a general shift of estimates toward the upper left arc of the circle. The second experiment replicated the preceding effects but also revealed that the regressions within quadrants of angular values were stronger after right visual field than after left visual field presentations. We interpret the dissociation between visual fields as evidence that memory for categorical spatial relations (Kosslyn, 1987) is more dependent on left-hemisphere than on right-hemisphere processing.     

National Security,Self-rule,and Democratic Action

Most discussions of the relationship between liberty and security focus on the idea that enhancing citizens’ security may require imposing constraints on their civil liberties (e.g., freedom of association, of movement, of communication, and so on). This paper explores the question of how measures to enhance security stand vis à vis the idea of political liberty, i.e. the idea of citizens’ collectively directing the power of their state. It distinguishes two models whereby citizens might enact that ideal of self-rule and argues that with respect to issues of national security, the less direct model, which entrusts political agents to make decisions beyond direct democratic input, will often be more appropriate. It argues as well that various practices often seen as fundamentally at odds with the ideal of rule by the people (e.g., government deception, lack of transparency, covert action) are in fact consistent with a reasonable construal of that ideal. It concludes by outlining various criteria that would have to be met for such practices to be morally permissible in democratic states.