Secrecy and suggestibility: are children's memories for secrets less suggestible than other memories?

Adult secrecy research has found a memory‐enhancing effect for information kept secret as the secret is mentally rehearsed each time the adult is required to prevent it being reported (e.g. Lane & Wegner, 1994). The present study examined possible memory‐enhancing effects of children keeping information secret. Two hundred and thirty two five to eight year olds took part in a puppet‐making task. During the task the puppet‐maker sprayed glitter onto the puppets. Half the children were told to keep a secret (that the spray had been taken from Disneyland) and the other half (the control group) were merely told the spray was from Disneyland. One week later the children were interviewed either by the puppet‐maker (the secret‐giver) or by the puppet‐maker's friend (the secret‐novice). The five to six year olds showed no effect of the secret condition, whereas the seven to eight year olds made significantly less errors in their free recall in the secret condition compared to the control condition. There was no effect of the secret condition on children's suggestibility to leading questions. However, both age groups were significantly more suggestible when interviewed by the secret‐giver. Finally, both age groups showed a recall deficit in the secret condition. Copyright © 2004 John Wiley & Sons, Ltd.     

Internalization of the thin and muscular body ideal and disordered eating in adolescence: the mediation effects of body esteem

This study investigates body esteem factors (weight-esteem and appearance-esteem) as mediators of the relationship between ‘internalization of the ideal body figure’ and disordered eating behaviors (restrained, emotional and external eating) in a community sample of adolescent males (n = 810) and females (n = 1137) from the Ontario Research on Eating and Adolescent Lifestyles (REAL) study. Mediation models were examined using a bootstrapping approach to test indirect effects and indirect contrasts. In males, weight-esteem partially mediated the relationship between muscular ideal and restrained eating; appearance-esteem partially mediated effects in the emotional and external eating regressions. In females, both weight-esteem and appearance-esteem partially mediated the relationship between thin ideal and all three forms of disordered eating; weight-esteem was a stronger mediator for restrained eating, and appearance-esteem a stronger mediator for emotional and external eating. Body esteem is important to consider for prevention and treatment of disordered eating in both genders.     

Extinction partially reverts structural changes associated with remote fear memory

Structural synaptic changes occur in medial prefrontal cortex circuits during remote memory formation. Whether extinction reverts or further reshapes these circuits is, however, unknown. Here we show that the number and the size of spines were enhanced in anterior cingulate (aCC) and infralimbic (ILC) cortices 36 d following contextual fear conditioning. Upon extinction, aCC spine density returned to baseline, but the enhanced proportion of large spines did not. Differently, ILC spine density remained elevated, but the size of spines decreased dramatically. Thus, extinction partially erases the remote memory network, suggesting that the preserved network properties might sustain reactivation of extinguished conditioned fear.     

Influence of early experience on processing 2D threatening pictures by European starlings (<Emphasis Type="Italic">Sturnus vulgaris</Emphasis>)

Stimuli such as visual representations of raptors, snakes, or humans are generally assumed to be universally fear-inducing in birds and considered as a product of evolutionary perceptual bias. Both naïve and experienced birds should thus react to such stimuli with fear reactions. However, studies on different species have shown the importance of experience in the development of these fear reactions. We hypothesized that the responses of adult European starlings to fear-inducing visual stimuli may differ according to experience. We compared the reactions of Hand-raised adults with no experience of predators to those of Wild-caught adults, with potentially extensive experience with predators. Three visual stimuli (i.e. human, raptor, snake) were broadcast to 17 birds as 2D pictures (displayed via a LCD screen) with different modalities of presentation: degree of proximity and with or without movement. The results reveal that the birds were particularly sensitive to proximity and movement, with more attention towards moving stimuli and more withdrawal for close stimuli. The human stimulus elicited attention in both the distant and moving modalities but, like the other stimuli, mostly withdrawal when it was close. Developmental experience appeared to influence the emotional level, as the Hand-raised birds reacted strongly to all stimuli and all modalities, contrarily to the WC birds which performed withdrawals almost only for close stimuli and attention to moving stimuli. Stimuli proximity and movement seemed, therefore, relevant features that elicited negative reactions in Wild-caught birds. The Hand-raised birds were equally attentive to both distant and moving stimuli. Thus the young birds showed no real discrimination. Early and later experiences may, therefore, influence birds’ reactions. Starlings may require experience with real threats to develop adaptive responses, i.e. limiting unnecessary loss of energy by fleeing in front of non-dangerous stimuli.