Age differences in the temporal locus of memory organization in children's recall

Age differences in when (i.e., at input or output) children organize information for recall were investigated in terms of a model specifying that information organized at input is more resistant to forgetting over time than information not organized at input. In Experiment 1, recall of items from categorically related and unrelated lists was assessed either immediately or after a 4-min delay. For 9-year-olds, the effect of delay was comparable for the related and unrelated lists, indicative of spontaneous organization at time of output. In contrast, 13-year-olds showed a significantly smaller delay effect with related than with unrelated lists, indicative of spontaneous organization at time of input. Experiments 2 and 3 demonstrated that, for 9-year-olds, high levels of clustering in and of themselves do not eliminate effects of delayed testing characteristic of output organization, and that when 9-year-olds are biased to organize information at input, delay effects are reduced only when measures are taken to ensure that all the category labels are retrieved.     

The generalization of deferred imitation in enculturated chimpanzees (Pan troglodytes)

Deferred imitation of object-related actions and generalization of imitation to similar but not identical tasks was assessed in three human-reared (enculturated) chimpanzees, ranging in age from 5 to 9 years. Each ape displayed high levels of deferred imitation and only slightly lower levels of generalization of imitation. The youngest two chimpanzees were more apt to generalize the model's actions when they had displayed portions of the target behaviors at baseline, consistent with the idea that learning is more likely to occur when working within the "zone of proximal development." We argue that generalization of imitation is the best evidence to date of imitative learning in chimpanzees. Electronic Publication     

Social demand characteristics in children's and adults' eyewitness memory and suggestibility: the effect of different interviewers on free recall and recognition

Shortly after viewing a video of a theft, 5‐ and 7‐year‐old children and adults were interviewed with free recall and either misleading or unbiased‐leading questions. After a 2‐day delay, participants were interviewed with free recall and recognition questions administered by either the same or a different interviewer. Results from day 1 replicate previous findings with levels of recall and resistance to suggestibility increasing with age. Counter to predictions, correct recognition performance on day 2 was greater for some participants interviewed by the same as opposed to a different interviewer, and incorrect recognition was greater for all groups of participants for those interviewed by a different as opposed to the same interviewer. Results are discussed in terms of the role of context dependence on memory performance. Copyright © 2000 John Wiley & Sons, Ltd.     

进化发展心理学：发展中的人类本性

进化发展心理学研究社会能力与认知能力发展背后的基因与环境机制,以及基因与环境机制在特定社会文化中的表现。进化发展心理学探讨的主要问题与设计到的主要概念包括：（1）自然选择在毕生发展的早期阶段发挥作用;（2）进化发展心理学特别重视适应在婴儿期及儿童期发展中的作用;（3）儿童期的延长有助于儿童学习人类社会的复杂性;（4）发展背景的方法可以用来理解成人外显行为的进化起源;（5）基因与环境因素相互影响约束个体发展;（6）认知能力与行为活动敏感于早期环境,但二者发展也具有可塑性     

The adaptive nature of children's overestimation in a strategic memory task

Kindergarten, first-, and third-grade children were given a multitrial sort-recall task with different items on each trial. Children were asked to predict how many items they would recall prior to each trial. We classified children into high- and low-overestimation groups based on their prediction accuracy on the first two trials and assessed changes in recall and strategy use over trials (trials 4/5 minus trials 1/2). Following predictions, at all grades, children in the high-overestimation group showed greater gains (or fewer losses) in recall than children in the low-overestimation group. Differences in strategy use over trials were generally nonsignificant. The results were interpreted as reflecting the adaptive nature of children's overestimation of their cognitive abilities.     

The Nestor effect: Extending evolutionary developmental psychology to a lifespan perspective

We extend an evolutionary perspective of development to the lifespan, proposing that human longevity may be related to the experience, knowledge, and wisdom provided by older members of human groups. In addition to the assistance in childcare provided by grandmothers to their daughters, the experience of wise elders could have served to benefit kin as well as members of the immediate group, and thus been the target of natural selection. We refer to the fitness-enhancing effect of cumulative and integrative knowledge of some members of a group as the Nestor effect, after the oldest member of the group of Greek kings in the siege of Troy. Furthermore, we argue that the contributions of such Nestors resulted in cultural innovations that in turn may have promoted care and respect for the elderly. This bidirectional effect makes culture both the product and producer of longevity.     

Children’s use of multiple and variable addition strategies in a game context

Developmental and contextual effects on children’s addition strategies were assessed in preschool, kindergarten and first‐grade children’s strategy use while playing a board game (‘Chutes and Ladders’), using one or two dice to compute moves. Children of all ages displayed multiple‐ and variable‐strategy use, and there was a progression toward more sophisticated strategy use with age. Different patterns of strategy use in the two‐dice condition were observed as a function of whether children began the game with one versus two dice and for children who could recognize (as opposed to having to count) die roles of ‘5’ and ‘6’ in the one‐die condition. An examination of latencies indicated that more noncounting (start‐up) time was required to execute the MIN than the SUM strategy. Children showed significantly greater speed and accuracy when adding numbers during the game than in the math problems that followed. The findings reflect young children’s flexible use of strategies and extend Siegler’s adaptive strategy choice model to the development of simple addition strategies in an everyday context.     

A developmental examination of ratings of associative strength

Ratings of associative strength between members of pairs of categorically related words were obtained for children from Grades 3,4,6, and 8 and for college adults. Correlations of ratings were high among the five grade levels, indicating that associative relations are an early form of semantic representation that change minimally in development.     

The natural emergence of reasoning about the afterlife as a developmental regularity

Participants were interviewed about the biological and psychological functioning of a dead agent. In Experiment 1, even 4- to 6-year-olds stated that biological processes ceased at death, although this trend was more apparent among 6- to 8-year-olds. In Experiment 2, 4- to 12-year-olds were asked about psychological functioning. The youngest children were equally likely to state that both cognitive and psychobiological states continued at death, whereas the oldest children were more likely to state that cognitive states continued. In Experiment 3, children and adults were asked about an array of psychological states. With the exception of preschoolers, who did not differentiate most of the psychological states, older children and adults were likely to attribute epistemic, emotional, and desire states to dead agents. These findings suggest that developmental mechanisms underlie intuitive accounts of dead agents' minds.     

An assessment of generalization of imitation in two enculturated orangutans (Pongo pygmaeus)

Deferred imitation of object-related actions and generalization of imitation to similar but not identical tasks were assessed in two human-reared (enculturated) orangutans (Pongo pygmaeus). Each ape displayed low levels of deferred imitation but did not provide evidence of generalization of imitation. Results suggest that enculturated orangutans may not possess social-cognitive abilities similar to that which enculturated chimpanzees are assumed to possess.