Temporal proximity and reinforcement sensitivity in multiple schedules

Distributions of reinforcers between two components of multiple variable-interval schedules were varied over a number of conditions. Sensitivity to reinforcement, measured by the exponent of the power function relating ratios of responses in the two components to ratios of reinforcers obtained in the components, did not differ between conditions with 15-s or 60-s component durations. The failure to demonstrate the “short-component effect,” where sensitivity is high for short components, was consistent with reanalysis of previous data. With 60-s components, sensitivity to reinforcement decreased systematically with time since component alternation, and was higher in the first 15-s subinterval of the 60-s component than for the component whose total duration was 15 s. Varying component duration and sampling behavior at different times since component transition may not be equivalent ways of examining the effects of average temporal distance between components.     

Source recall enhances children's discrimination of seen and heard events

The effects of rehearsing actions by source (slideshow vs. story) and of test modality (picture vs. verbal) on source monitoring were examined. Seven- to 8-year-old children (N = 30) saw a slideshow event and heard a story about a similar event. One to 2 days later, they recalled the events by source (source recall), recalled the events without reference to source (no-source-cue recall), or engaged in no recall. Seven to 8 days later, all children received verbal and picture source-monitoring tests. Children in the source recall group were less likely than children in the other groups to claim they saw actions merely heard in the story. No-source-cue recall impaired source identification of story actions. The picture test enhanced recognition, but not source monitoring, of slide actions. Increasing the distinctiveness of the target events (Experiment 2) allowed the picture test to facilitate slideshow action discrimination by children in the no-recall group.     

Knowing in advance: the impact of prior event information on memory and event knowledge

We examined the influence of newly acquired information on children's memory and general representation of a personally experienced event. Thirty-five children between the ages of 5 and 7 years participated in the novel event (Visiting the Pirate). The day before participating, children were: (1) provided with new information specific to the up-coming event; (2) engaged in a discussion generally related to the event topic based on existing knowledge; or (3) discussed an unrelated topic. Advance information specific to the event led to better recall and, in particular, to better integration of the experience into a general event representation both soon after the event and at a follow-up interview 4 months later, whereas general discussion of the topic without the event specific information neither enhanced memory reports nor facilitated the integration of event information. Providing information in advance can have significant effects on memory and knowledge acquisition although many variables, including those relating to the specific content of the information, will affect this relation.     

The child in time: The influence of parent–child discussion about a future experience on how it is remembered

We investigated the influence of preparation provided by parents on preschoolers’ recall. One day before children participated in a staged novel event, parents discussed the event with their child either with (verbal+photos) or without (verbal) photographs. Parents and children in a control condition read an unrelated story. Then 8–10 days later the children were interviewed about the event. Children in the verbal+photos condition recalled significantly more than those in the control condition. Parental preparation style (e.g., evaluations, hypothetical language) was associated with the child's contributions to the preparatory discussion, but no aspect of parent or child style or content was associated with children's verbal recall. Similarly, there were no significant associations between children's performance on a task of episodic future thinking, and their preparatory discussion or recall, although episodic future thinking was strongly associated with language ability. The potential underlying mechanisms and theoretical implications are discussed.     

How quickly do children forget events? A systematic study of children's event reports as a function of delay

Sixty‐six children aged between 5 and 7 years participated in the event, ‘Visiting the Pirate’, and were interviewed about it at one of five delays, namely, no delay (immediate interview), or at a 1‐week, 1‐day, 1‐month or 6‐month delay. For open‐ended recall, a significant decrease in the amount of information reported was detected only at the 6‐month delay, although forgetting functions indicated forgetting was most rapid at the shorter delays. Accuracy of open‐ended recall was maintained over all delays. In contrast, in response to specific, leading and misleading questions, accuracy had decreased significantly by the 6‐month delay. The theoretical and practical implications of these findings regarding the effects of delays on children's event reports are discussed. Copyright © 2002 John Wiley & Sons, Ltd.     

Are two heads better than one? Peer support and children's eyewitness reports

This study examined the effects of peer support on children's event reports. In Experiment 1, 48 children aged between 5 and 10 years who had been scheduled for a school dental visit involving an invasive procedure were interviewed about it 2–4 days later. Children were interviewed alone, with an informed peer (who had also recently had a dental appointment), or with an uninformed peer. Anxiety was assessed both prior to the dental appointment and at the time of the recall interview. Peer support did not influence children's anxiety or the amount or the accuracy of information reported in prompted recall. However, younger children interviewed alone were significantly more likely to be misled than those interviewed in the presence of a support child. In Experiment 2, children aged between 5 and 7 years took part in a neutral event contrived for the study. They were interviewed about it 3 days later, either alone or with an informed or uninformed support child present. The support child was encouraged to take an active part in the interview and to help the target child to describe what happened. Peer support did not influence the recall of the target child in either prompted recall or in response to questions. However, together the target and informed support children reported more information than did children interviewed alone or with uninformed support. © 1997 John Wiley & Sons, Ltd.     

Enhancing children's event recall after long delays

The effects of context reinstatement as means of enhancing 5‐ and 6‐year‐old children's event memory in repeated interviews after a 6‐month delay were examined. Children were interviewed immediately after the event (baseline interview) and twice at a 6‐month delay, with 24 hours between interviews. The first 6‐month interview was conducted in a perfect‐context reinstatement (n = 15), imperfect‐context reinstatement (n = 16), or no‐context reinstatement (n = 15) condition. The second 6‐month interview was conducted 24 hours later with no‐context reinstatement for all children. Context reinstatement attenuated the effects of delay on recall. The accuracy of the details reported was greater in the perfect‐context compared to the imperfect‐context and no‐context conditions. Details repeated between the immediate‐baseline interview and in the first 6‐month interview were more accurate than details repeated between the first and second 6‐month interview. There was no increase in recall (hypermnesia) across the first and second 6‐month interviews in any condition. Practical implications of these findings are discussed. Copyright © 2006 John Wiley & Sons, Ltd.     

Does providing props during preparation help children to remember a novel event?

We investigated the conditions under which preparatory information presented 1 day before a novel event influenced 6-year-olds' recall 1 week later. Children were assigned to one of six experimental conditions. Three conditions involved preparatory information that described the event accurately but differed according to the presence and type of props (verbal, real props, and toy props). In two conditions, which also differed according to whether verbal information was supplemented with real props, half of the preparatory information described the event accurately, whereas the other half was thematically similar to, but inconsistent with, the event (misleading verbal and misleading props). Compared with the attentional control condition, all forms of preparation that described the event accurately increased correct recall. Preparation that included props improved photograph recognition. When half of the accurate information was replaced by misleading information, the positive benefit on recall was reduced, and when misleading props accompanied the misleading information, errors increased. The potential underlying mechanisms and implications for pediatric settings are discussed.     

Sensitivity to reinforcer duration in a self-control procedure

In a concurrent-chains procedure, pigeons' responses on left and right keys were followed by reinforcers of different durations at different delays following the choice responses. Three pairs of reinforcer delays were arranged in each session, and reinforcer durations were varied over conditions. In Experiment 1 reinforcer delays were unequal, and in Experiment 2 reinforcer delays were equal. In Experiment 1 preference reversal was demonstrated in that an immediate short reinforcer was chosen more frequently than a longer reinforcer delayed 6 s from the choice, whereas the longer reinforcer was chosen more frequently when delays to both reinforcers were lengthened. In both experiments, choice responding was more sensitive to variations in reinforcer duration at overall longer reinforcer delays than at overall shorter reinforcer delays, independently of whether fixed-interval or variable-interval schedules were arranged in the choice phase. We concluded that preference reversal results from a change in sensitivity of choice responding to ratios of reinforcer duration as the delays to both reinforcers are lengthened.     

Individual differences in children's event memory reports and the narrative elaboration technique

Children between 7 and 8 years old took part in a staged event at school and 1 week later were assessed using a short form of the Wechsler Intelligence scale for children (third edition) and measures of metamemory, narrative ability, and socioeconomic status. Two weeks following the event, children either received narrative elaboration training (NET; K.J. Saywitz & L. Snyder, 1996) and were prompted with the four NET cue cards at interview; received verbal prompts corresponding to the cue card categories, but without prior training; or were presented with the cards at interview without prior training. Children given verbal labels as prompts recalled as much information as children who received NET training and cue cards. Measures of intelligence were predictive of amount recalled for cards-only children but not for the other 2 groups, indicating that differences in recall between low- and high-IQ groups were attenuated when recall was supported by NET training or verbal prompting.