Age differences in organization and recall: The effects of training in categorization

An alternating sort/recall task was employed to train fourth graders and college students in organizational strategies. Free-sorting Ss, at both age levels, sorted a group of words into two to seven categories. Analyses of final sorting patterns indicated reliable differences between the children and adults. The organizational schemes thus developed by the free-sorting Ss were taught, by means of a yoking procedure, to other Ss. Results indicated that the recall of fourth graders was improved when they were forced to learn the sorting patterns developed by the older Ss. Similarly, impairment in the recall of college students was observed when they were required to sort according to the organization employed by the fourth graders. These findings imply that changes in organization can result in changes in recall performance.     

Developmental differences in recall: Encoding or retrieval?

First- and fifth-grade children and college adults (ages 6, 10, and 18 years, respectively) were presented a 30-item set of pictures to recall in a 4-trial study-test procedure. The stimuli were presented in one of three ways (encoding condition): randomly, blocked (according to categories), or sort (the subject was given the stimuli in random order and asked to sort them into categories). Recall was either free, cued, or constrained (retrieval condition). Results indicated that maximum adult recall was a function of the interaction of encoding and retrieval conditions, and that first- and fifth-grader's recall was influenced by retrieval conditions but not by encoding conditions. The blocked and sort encoding conditions did result in increased clustering relative to random encoding at all three ages, however. It was concluded that encoding conditions influence recall only as they effect the use of retrieval strategies.     

Use of relational and item-specific information in remembering by older and younger adults

The applicability to older adults of predictions from the integrated memory model, that optimal memory results from concurrent availability of relational and item-specific information, was assessed. In Experiment 1, older adults (M = 69 years) encoded related or unrelated words using rating, sorting, or both tasks. Using both tasks produced better recall than either separate task. Rating facilitated recall for related items, but sorting did not facilitate unrelated items. In Experiment 2, younger (M = 20) and older (M = 74) adults sorted or rated lists comprising categories of varying sizes. Young adults' free recall conformed to predictions, but older adults again showed facilitation mainly from rating larger categories. The stronger effects for younger adults imply that specific combinations of encoding and retrieval manipulations and materials must be considered in predicting older adults' performance.     

Development of hierarchical conceptual relationships in children's semantic memories

The present study was designed to determine when children first display evidence of hierarchical conceptual organization. Children aged 5 to 9 answered either semantic or sensory questions about a list of words composed of either superordinate terms, prototypical category instance, or moderately typical instances. In a later unanticipated cued recall task the children were given taxonomically related cues composed of the two remaining word types not used in the orienting phase. The 5-year-olds' performance revealed that they possessed a modest degree of hierarchically organized conceptual information, which by age 9 had developed to relatively sophisticated levels. In particular, it was found that the range of information contained in the 5-year-olds' conceptual hierarchies was considerably narrower than that of the 9-year-olds', which supports Rosch's contention that conceptual categories are first constructed around prototypical instances. The children's performance on the cued recall task was also compared to their performance on traditional class inclusion and object-sorting tasks. It was found that the object-sorting task overestimated, while the class inclusion task underestimated the extent to which conceptual information is hierarchically organized in 5-year-olds.     

Inadequacy of recall as a basis for frequency knowledge.

Subjects studied a word list comprising varying numbers of words from distinct semantic categories. The category names (trees, colors, etc.) were then re-presented, and for each name subjects either recalled as many exemplars as they could or estimated how many had been included in the list (Experiments 1 and 2). Recall was not sufficiently informative about actual category sizes to account for performance in the frequency estimation task. Moreover, it remained insufficiently informative when efforts were made to induce a recall-estimate strategy by requiring overt recall prior to estimation (Experiments 3-5), by using very small categories (Experiment 4), and by not showing the category name at study (Experiment 5), even though it did allow a partial account of estimation when the category exemplars were individually cued (Experiment 6). It is concluded that the role of recall in frequency estimation is much exaggerated.     

The development of the category-recall relationship in the sorting-recall task

The relationship between categorical organization and recall for children in grades two, four, and six (ages 8, 10 and 12 years, respectively), and for adults was investigated using the sorting-recall procedure. Subjects sorted unrelated words on individual cards into either two, four, or six categories prior to output, and recall performance improved significantly as a function of increased numbers of sorting categories. The category-recall relationship was shown to be independent of the effects of subject-determined item exposure time in sorting. This result was taken as evidence for a basic structural property of memory (“chunking”) that does not vary as a function of age. We further speculated that the slopes of the category-recall function obtained in this study suggest a limit on the size of organizational units in young children's memory.     

Qualitative and quantitative considerations in encoding difficulty effects

We hypothesized that the effects of encoding difficulty on the memorability of verbal material would depend on both the type of processing induced by the difficulty manipulation and the type of processing afforded by the material. We predicted that if the processing induced by encoding difficulty were complementary to the processing afforded by the material, then difficulty would enhance recall more so than if the processing induced by the two sources were redundant. These expectations were tested by requiring subjects to process either a structured or an unstructured word list with either a sorting task or a pleasantness rating task; the difficulty of each orienting task was also manipulated. We assumed that sorting and pleasantness rating required primarily relational and individual-item processing, respectively, and that the structured and unstructured word lists afforded relational and individual-item processing, respectively. These assumptions were supported by clustering in free recall and by recognition performance. The primary finding was that difficult sorting increased recall only for the unrelated list, whereas difficult pleasantness judgments increased recall most robustly for the related list. These results support the present framework and help illuminate the boundary conditions of the “difficulty effect.”     

Sequential consistency and subjective clustering in the multitrial free recall of children

The organization imposed by children on lists presented in a multitrial free recall task was investigated in two experiments. In the first, 6 and 9 year olds were tested for multitrial free recall of an unstructured noun or mixed list, followed by two sorting trials. Organization was quantified using two structurally comparable indices. One was an index of subjective clustering, based on individual word groupings determined in the sorting trials, and the other was an index of the sequential consistency of recall order over successive trials. The older children had significantly higher scores on recall and subjective clustering but there was no age effect on sequential consistency. In the second experiment 6, 8 and 10 year olds were tested for multitrial free recall of line drawings of common objects. Two sorting trials followed and organization was quantified using the subjective clustering and sequential consistency indices. Recall and subjective clustering scores again showed significant increases with age. As before, no age effect on sequential consistency was found. The results were interpreted in terms of a differential sensitivity of the two indices to an age-related qualitative change in the basis of organization.     

Encoding processes and sex-role preferences

Seven- and 10-year-old children were tested on memory and sex-role preference tasks. The memory task was the Wickens release from proactive inhibition paradigm in which short-term recall of words is tested on successive trials. On Trials 1–4, words were selected from one of two categories, either words with masculine or feminine connotations. On Trial 5, words were drawn from the second category. Sex-role preference was assessed by asking the child to select his favorite pictures from an array that included masculine and feminine items. Recall by boys at both ages increased following a shift between words with masculine or feminine connotations, suggesting that this dimension of a word's meaning was encoded in memory. Recall by girls who selected a feminine item as their favorite on the sex-role preference task increased following a category shift; recall by girls who chose a masculine item did not increase. These results are discussed in relation to previous research on the attributes of encoding in children's memory.     

Developmental changes in word attribute utilization for organization and retrieval in free recall

The development of two distinct but related activities in free recall: organization and retrieval, was examined in relation to the development of memory attributes. Twenty-five words printed on cards were chosen to be cross-classified according to conceptual category and according to acoustic similarity. Second-graders (8 year olds), sixth-graders (12 year olds), and college students (20 year olds) either sorted the stimulus words as they wished, were yoked to another subject's sort, or were instructed to sort the words in a blocked fashion according to one attribute or the other. Age differences in attribute preference for sorting were found, as well as significant interactions between age level and attribute basis for mean recall-within-categories, for cued recall, and for clustering in free recall. The results lend strong support to the theory that attribute dominance does in fact change as a function of age, in terms of both organizational schemes and the role of these schemes for recall, and suggest that psychologists reexamine the present notions of children's organizational skills in recall tasks.     

Helping children apply their knowledge to their behavior on a dimension-switching task

To investigate why 3-year-olds have difficulty in switching sorting dimensions, children of 3 and 4 years were tested in one of four conditions on Zelazo's card sort task: standard, sleeve, label and face-up. In the standard condition, children were required to sort blue-truck and red-star cards under either a blue-star or red-truck model card, first by color or shape, and then by the other dimension. Here 3-year-olds sorted correctly until the dimension changed; they continue to sort by the initial dimension. The sleeve condition (placing the sorting cards in an envelope prior to sorting) had little effect. In the label condition, the child labeled the relevant sorting dimension on each trial. Most 3-year-olds succeeded; evidently their labeling helped them refocus their attention, overcoming ‘attentional inertia’ (the pull to continue attending to the previously relevant dimension). In the face-up condition, attentional inertia was strengthened because sorted cards were left face-up; 4-year-olds performed worse than in the standard condition. We posit that attentional inertia is the core problem for preschoolers on the card sort task.     

Development of strategies for recalling letter sequences

Kindergarten, second-grade, and fourth-grade children (6, 8, and 10 years of age, respectively) were asked to recall letter sequences on a task that required the use of: (a) a verbal strategy; (b) a positional strategy; or (c) either strategy. Additional trials, allowing either strategy, were interspersed among those requiring a verbal or positional strategy; strategy use was determined from performance on these interspersed trials. The results show that children at all grade levels attempted to use a task-appropriate strategy. Performance on the verbal task showed a more marked developmental increase than did performance on the positional task. A second experiment replicated the first with the interspersed trials removed. A third experiment was designed to determine whether letter names interfered with older children's efficient use of a positional strategy. Even with this source of interference removed, the developmental pattern of Experiments 1 and 2 was replicated. There was a Sex by Condition interaction in Experiments 2 and 3 which showed that males do better in the condition requiring a positional strategy, and females do better in the condition requiring a verbal strategy.     

Memory strategies in children with learning disabilities

Memory strategies were examined among children, 7–13 years old, with diagnosed learning disabilities, in order to investigate whether they perform in appropriately active and efficient ways. The children were grouped at two age levels and administered tasks of serial recall and free recall. A strategy-training session was conducted on the second task. On the serial recall, neither age group showed evidence of rehearsal, in contrast to previous studies. On the free recall task, the younger children's performance was consistent with the mediation deficiency hypothesis, while the older children improved in sorting, clustering, and recall following training; i.e., they showed a typical production deficiency. There was support for considering this sample of learning disabled children as inactive learners, with potential developmental change. Serial recall improved with age, and the older children's production deficiences in free recall appeared to be ameliorated with training in organizational strategies.     

The development of organizational strategies in children: evidence from a microgenetic longitudinal study

The authors examined memory on a sort-recall task in children 8 to 12 years of age. Children were first classified as either strategic or nonstrategic on a sort-recall pretest and then participated in an 11-week microgenetic study involving nine sessions. Strategy use was assessed on each trial. Consistent with past longitudinal research, changes from nonstrategic to strategic behavior occurred suddenly rather than gradually. Once children began using organizational strategies, their recall performance improved immediately. Deliberate strategy use was clearly reflected by sorting behavior during encoding but not in clustering during recall. Conclusions about whether there are children with utilization deficiencies are thus affected by how the concept is defined and whether sorting or clustering is taken as the indicator of spontaneous strategy use.     

Persistent overconfidence despite practice: The role of task experience in preschoolers’ recall predictions

In three experiments, preschoolers’ ability to predict their picture recall was examined. Children studied 10 pictures, predicted how many they would recall, and then attempted to recall them. This study-prediction-recall trial was repeated multiple times with new pictures on each trial. In Experiment 1, children were overconfident on the initial trial, and this overconfidence persisted across three trials. In Experiment 2, children predicted either their own performance or another child’s performance. Their predictions were overconfident across all trials regardless of whether they made predictions for themselves or for another child, suggesting that wishful thinking cannot fully account for their overconfidence. In Experiment 3, some children postdicted their previous recall performance prior to making each prediction. Although their postdictions were quite accurate, their predictions were still overconfident across five trials. Preschoolers’ overconfidence was remarkably resistant to the repeated experience of recalling fewer pictures than the children had predicted. Even asking them to report the number that they recalled on a previous trial, which they could do accurately, did not cause them to lower their predictions across trials.     

Developmental Differences in Understanding and Solving Simple Mathematics Word Problems

The hypothesis was tested that older chidren, fifth/sixth graders versus third graders, who are more accurate in word problem solution, would show evidence of problem differentiation consistent with schema theories of problem representation and solution. A mathematics word problem sorting task and an accuracy test were used to assess problem representation and accuracy of solution across 16 different problem types. Cluster analyses of sorting data revealed that older children demonstrated sorting patterns consistent with a refined schema theory. Younger children were both less accurate and less systematic in their sorting. Idealized sorting patterns representing schema theories as well as surface structure problem similarity were tested against actual sorting patterns. Regression analyses confirmed that the fifth/sixth graders' and third graders' sorting data were best fit by a schematic sort and by a surface structure sort, respectively. Additionally, an English versus Spanish language contrast showed no effect of language on either accuracy of solution or the sorting patterns of the math word problems.     

Input organization as a mediating factor in memory: A comparison of educable mentally retarded and nonretarded individuals

The effect of presentation context on the organization and recall of strongly related and weakly related words was examined in EMR adolescents and nonretarded fifth-grade children of the same mental age (131 months). In blocked presentation formats, subjects sorted words into experimenter-defined groups of four, in which the order of the groupings either changed from trial to trial (i.e., blocked-random), or was consistent across trials (i.e., blocked-consistent). In sort-prompt conditions, subjects were free to structure their own relationships among items during presentation, following instructions to form meaning-based groups (i.e., minimum-sort-prompt), or given explicit training in sorting categorization and sorting stability (i.e., maximum-sort-prompt). Both subject groups found the minimum-sort-prompt method to be as effective as the maximum-sort-prompt method for improving measures of recall and clustering relative to the blocked-random method. Nevertheless, nonretarded children showed higher levels of organization for strongly related items, and better recall and organization for weakly related items. Subsequent analyses suggested that the lower memory performance of the EMR individuals receiving weakly related items was the result of both inconsistent and poorly structured sorting schemes across trials.     

Young children's knowledge of their memory span: effects of task and experience

This study investigated the hypothesis that young children have knowledge about their memory that they may be unable to articulate, but are able to reflect on and use in problem-solving. Forty-eight kindergarteners made one of two types of judgments about their memory span for words. Half of the children made prospective verbal predictions about the number of words they thought they could recall from a list of 10. The other half made concurrent, nonverbal predictions by listening to words on a tape and manually stopping the tape when they heard as many words as they thought they could recall. Children's actual recall for words was then assessed. All children participated in multiple trials to assess the effect of task experience on their predictions. Analyses revealed that predictions made in the concurrent task were significantly more accurate than those made in the prospective task. All children lowered their predictions across trials, although only in the concurrent task were children's final-trial predictions not significantly greater than their actual recall. No meaningful effects or interactions were associated with actual recall scores. These results revealed that young children manifested greater memory knowledge when this knowledge was assessed through their concurrent problem-solving behavior rather than through their prospective verbal predictions.     

Task experience and children's working memory performance: a perspective from recall timing

Working memory is an important theoretical construct among children, and measures of its capacity predict a range of cognitive skills and abilities. Data from 9- and 11-year-old children illustrate how a chronometric analysis of recall can complement and elaborate recall accuracy in advancing our understanding of working memory. A reading span task was completed by 130 children, 75 of whom were tested on 2 occasions, with sequence length either increasing or decreasing during test administration. Substantial pauses occur during participants' recall sequences, and they represent consistent performance traits over time, while also varying with recall circumstances and task history. Recall pauses help to predict reading and number skills, alongside as well as separate from levels of recall accuracy. The task demands of working memory change as a function of task experience, with a combination of accuracy and response timing in novel task situations being the strongest predictor of cognitive attainment.     

The testing effect in free recall is associated with enhanced organizational processes

In two experiments with categorized lists, we asked whether the testing effect in free recall is related to enhancements in organizational processing. During a first phase in Experiment 1, subjects studied one list over eight consecutive trials, they studied another list six times while taking two interspersed recall tests, and they learned a third list in four alternating study and test trials. On a test 2 days later, recall was directly related to the number of tests and inversely related to the number of study trials. In addition, increased testing enhanced both the number of categories accessed and the number of items recalled from within those categories. One measure of organization also increased with the number of tests. In a second experiment, different groups of subjects studied a list either once or twice before a final criterial test, or they studied the list once and took an initial recall test before the final test. Prior testing again enhanced recall, relative to studying on the final test a day later, and also improved category clustering. The results suggest that the benefit of testing in free recall learning arises because testing creates retrieval schemas that guide recall.