On the Interaction of Theory and Data in Concept Learning

Standard models of concept learning generally focus on deriving statistical properties of a category based on data (i.e., category members and the features that describe them) but fail to give appropriate weight to the contact between people's intuitive theories and these data. Two experiments explored the role of people's prior knowledge or intuitive theories on category learning by manipulating the labels associated with the category. Learning differed dramatically when categories of children's drawings were meaningfully labeled (e.g., “done by creative children”) compared to when they were labeled in a neutral manner. When categories are meaningfully labeled, people bring intuitive theories to the learning context. Learning then involves a process in which people search for evidence in the data that supports abstract features or hypotheses that have been activated by the intuitive theories. In contrast, when categories are labeled in a neutral manner, people search for simple features that distinguish one category from another. Importantly, the final study suggests that learning involves an interaction of people's intuitive theories with data, in which theories and data mutually influence each other. The results strongly suggest that straight-forward, relatively modular ways of incorporating prior knowledge into models of category learning are inadequate. More telling, the results suggest that standard models may have fundamental limitations. We outline a speculative model of learning in which the interaction of theory and data is tightly coupled. The article concludes by comparing the results to recent artificial intelligence systems that use prior knowledge during learning.     

Children's Explanations as a Window Into Their Intuitive Theories of the Social World

Social categorization is an early emerging and robust component of social cognition, yet the role that social categories play in children's understanding of the social world has remained unclear. The present studies examined children's (N = 52 four‐ and five‐year olds) explanations of social behavior to provide a window into their intuitive theories of how social categories constrain human action. Children systematically referenced category memberships and social relationships as causal‐explanatory factors for specific types of social interactions: harm among members of different categories more than harm among members of the same category. In contrast, they systematically referred to agents' mental states to explain the reverse patterns of behaviors: harm among members of the same category more than harm among members of different categories. These data suggest that children view social category memberships as playing a causal‐explanatory role in constraining social interactions.     

The conceptualisation of forgiveness among Turkish children and adolescents

This study examined (a) how Turkish children and adolescents define forgiveness, (b) the association between self‐reported forgiveness and the concepts participants hold and (c) the association between self‐reported forgiveness and age. Three hundred and sixty‐seven Turkish children in primary (N = 220) and secondary schools (N = 147) were involved in the study. Participants were asked to define forgiveness, and the study used the Enright Forgiveness Inventory for Children (EFI‐C). Participants' conceptions of forgiveness were categorised into four groups: conditional forgiveness, reconciliation, ignoring the hurtful event and affective reactions. Half of all the participants in the study were found to be in the conditional forgiveness category. Turkish children were found to be mostly in the category of conditional forgiveness, reconciliation and affective reactions compared with adolescents. Adolescents were mainly found to be in the ignoring the hurtful event category. The highest self‐reported forgiveness mean was in the affective reactions category. Participants were commonly offended by friends, siblings, teachers and fathers. No correlation was found between self‐reported forgiveness and age. The present results expand the literature of forgiveness by presenting evidence that Turkish children's and adolescents' understanding of forgiveness moderately relates to theoretical definitions.     

The effect of actual event duration and event memory on the reconstruction of duration information

Two experiments investigated the effect of actual event duration and event memory on the retrospective estimation of public event duration. Experiment 1 provided a typicality score for each of 20 public events. The typicality score represents the degree to which the event's actual duration deviates from the typical duration of its category. Subjects in Experiment 2 estimated the duration of the events used in Experiment 1 and indicated whether they remembered the events. Typicality scores were found to be highly correlated with estimation accuracy, and to predict whether event duration was under- or over-estimated. Remembering an event slightly increased estimation accuracy. The results are discussed in terms of their implications for the assessment of eyewitness retrospective duration estimation abilities, and the reconstructive model of retrospective duration estimation proposed by Burt and Kemp (1991).     

Monitoring of learning at the category level when learning a natural concept: Will task experience improve its resolution?

Researchers have recently begun to investigate people's ability to monitor their learning of natural categories. For concept learning tasks, a learner seeks to accurately monitor learning at the category level — i.e., to accurately judge whether exemplars will be correctly classified into the appropriate category on an upcoming test. Our interest was in whether monitoring resolution at the category level would improve as participants gain task experience across multiple study-test blocks, as well as within each block. In four experiments, exemplar birds (e.g., American Goldfinch, Cassin's Finch) paired with each family name (e.g., Finch) were studied, and participants made a judgment of learning (JOL) for each exemplar. Of most interest, before and after studying the exemplars, participants made category learning judgments (CLJs), which involved predicting the likelihood of correctly classifying novel birds into each family. Tests included exemplars that had been studied or exemplars that had not been studied (novel). This procedure was repeated for either one or two additional blocks. The relative accuracy of CLJs did not improve across blocks even when explicit feedback was provided, whereas item-by-item JOL accuracy improved across blocks. Category level resolution did improve from pre-study to post-study on an initial block, but it did not consistently increase within later blocks. The stable accuracy of CLJs across blocks poses a theoretical and empirical challenge for identifying techniques to improve people's ability to judge their learning of natural categories.     

The categorical representation of visual pattern information by young infants

The present research studied 3- and 4-month-old infants' ability to acquire two categories simultaneously. A familiarization-novelty preference procedure and geometrical form categories were used in all experiments. In Experiments I and 3, infants were familiarized with either a single form category, two form categories, or a single form category plus a set of forms that did not define a category. The results showed that, despite increased attentional and memorial demands, presentation of an additional form category did not harm the efficiency of categorization (Experiment 1) and changed the representation of the form category information from exemplars to a prototype (Experiment 3). Contrasting form information that was not categorical in structure decreased the infant's ability to recognize new members of the single familiar category (Experiment 1) and hindered the infant's ability to form a categorical representation (Experiment 3). The categorization behavior observed in Experiment 1, as indexed by the generalization of habituation to novel forms from a familiar category, was shown not to be a consequence of the inability to discriminate between individual members from the familiar form category (Experiment 2). The implications of these results for cognitive development are discussed.     

Normative Social Role Concepts in Early Childhood

The current studies (N = 255, children ages 4–5 and adults) explore patterns of age‐related continuity and change in conceptual representations of social role categories (e.g., “scientist”). In Study 1, young children's judgments of category membership were shaped by both category labels and category‐normative traits, and the two were dissociable, indicating that even young children's conceptual representations for some social categories have a “dual character.” In Study 2, when labels and traits were contrasted, adults and children based their category‐based induction decisions on category‐normative traits rather than labels. Study 3 confirmed that children reason based on category‐normative traits because they view them as an obligatory part of category membership. In contrast, adults in this study viewed the category‐normative traits as informative on their own (not only as a cue to obligations). Implications for continuity and change in representations of social role categories will be discussed.     

Inter‐category versus intra‐category fit: when social categories match social context

The goal of the research reported in this article was to examine whether social categorization, commonly thought to be a function of accessibility and intra‐category fit, is also sensitive to changes in inter‐category fit. Intra‐category fit refers to the match between a target person's features and stored categorical knowledge, inter‐category fit to the extent to which category memberships and targets' features covary across perceived group members. In Experiments 1, 2, and 3, members of social categories of low, medium, and high accessibility, respectively, were shown in a group discussion. Inter‐category fit was manipulated in three steps. Category salience in memory increased as an additive function of accessibility and inter‐category fit. Experiment 4 replicated the effects of inter‐category fit while intra‐category fit and the information presented for individual discussants were held constant. The present studies are the first to demonstrate an effect of inter‐category fit on a relatively direct measure of spontaneous social categorization. Copyright © 2004 John Wiley & Sons, Ltd.     

Culture,category salience,and inductive reasoning

The role of category salience in category-based induction was demonstrated in two ways: (i) temporarily increasing category salience facilitated category-based induction, and (ii) this effect was moderated by cultural differences that we predicted would be related to chronic category salience. Subjects for whom categories were presumed to be more accessible (Americans) were not as much influenced by manipulations to increase category salience as subjects who were presumed to have lower chronic accessibility of categories (Koreans). However, as anticipated, this pattern was reversed for inferences about behavioral properties of social categories. Due to the `interdependent' nature of their culture, Koreans presumably have relatively higher chronic accessibility for social categories than do relatively `independent' Americans, and hence were not influenced as much by increasing category salience.     

The role of associative strength in children's false memory illusions

The effects of associative strength on rates of 7- and 11-year-old children's true and false memories were examined when category and Deese-Roediger-McDermott (DRM) lists were used to cue the same critical lure. Backward associative strength (BAS) was varied such that the category and DRM lists had the same strength (DRM=category), DRM lists had more BAS (DRM>category), or category lists had more BAS (DRM<category). If BAS drives children's false memories then BAS, not the type of relation across items in a list, should determine false memory production. The results confirmed this prediction using both recall and recognition measures: (1) both true and false memories increased with age, (2) true memory was better for category than DRM lists but there were no differences for false memory, and (3) at all ages, false memories varied predictably with changes in BAS but were unaffected by list-type manipulations. These findings are discussed in the context of models of false memory development.     

The Diagnostic Utility of Welsh's A-R Categories

The purpose of this study was to determine if the diagnosis-A-R category relationships described by Welsh hold for other patient samples. White, nonorganic males were categorized into one of four quadrants using Welsh's criteria. Statistical analysis showed no differences among the subgroups with regard to age, IQ, education or marital status. The major analysis disclosed no support whatsoever for Welsh's findings, either for all diagnostic groupings or for the separate diagnostic subgroupings presumably related to specific quadrants.     

Learning about the internal structure of categories through classification and feature inference

Previous research on category learning has found that classification tasks produce representations that are skewed toward diagnostic feature dimensions, whereas feature inference tasks lead to richer representations of within-category structure. Yet, prior studies often measure category knowledge through tasks that involve identifying only the typical features of a category. This neglects an important aspect of a category's internal structure: how typical and atypical features are distributed within a category. The present experiments tested the hypothesis that inference learning results in richer knowledge of internal category structure than classification learning. We introduced several new measures to probe learners' representations of within-category structure. Experiment 1 found that participants in the inference condition learned and used a wider range of feature dimensions than classification learners. Classification learners, however, were more sensitive to the presence of atypical features within categories. Experiment 2 provided converging evidence that classification learners were more likely to incorporate atypical features into their representations. Inference learners were less likely to encode atypical category features, even in a “partial inference” condition that focused learners' attention on the feature dimensions relevant to classification. Overall, these results are contrary to the hypothesis that inference learning produces superior knowledge of within-category structure. Although inference learning promoted representations that included a broad range of category-typical features, classification learning promoted greater sensitivity to the distribution of typical and atypical features within categories.     

Social categorization and similarity in intergroup behaviour

The present study is one of a series exploring the role of social categorization in intergroup behaviour. It has been found in our previous studies that in ?minimal' situations, in which the subjects were categorized into groups on the basis of visual judgments they had made or of their esthetic preferences, they clearly discriminated against members of an outgroup although this gave them no personal advantage. However, in these previous studies division into groups was still made on the basis of certain criteria of ?real' similarity between subjects who were assigned to the same category. Therefore, the present study established social categories on an explicitly random basis without any reference to any such real similarity. It was found that, as soon as the notion of ?group' was introduced into the situation, the subjects still discriminated against those assigned to another random category. This discrimination was considerably more marked than the one based on a division of subjects in terms of interindividual similarities in which the notion of ?group' was never explicitly introduced. In addition, it was found that fairness was also a determinant of the subjects' decisions. The results are discussed from the point of view of their relevance to a social-cognitive theory of intergroup behaviour.     

TEACHING MULTIPLICATION FACTS TO STUDENTS WITH LEARNING DISABILITIES

Multiple baseline designs were used to examine the effects of an instructional package on accuracy of performance in solving multiplication facts by 3 students with learning disabilities. The instructional package included the following components: (a) a modified instructional sequence in which multiplication facts were grouped into the zeros, ones, doubles, fives, and nines categories, and those remaining; (b) identification of the category in which each fact belonged; (c) mnemonic strategies associated with solving facts in each category; and (d) steps to be completed for solving facts in each category. Results indicated that the instructional package produced substantial and immediate effects. After receiving instruction, a participant's accuracy was often 100%, and this was maintained throughout the evaluation even as other strategies were introduced. Comparable results occurred across students, demonstrating replication of the effects of the instructional package.     

Why do categorization effects occur in comparative judgment tasks?

Three experiments were conducted to understand what eliminates the symbolic distance effect for reaction times (RTs) when subjects learn that items belong to categories. Artificial city locations were judged, and artificial states served as categories. In Experiment 1, whether or not categories were presented and the amount of categorization practice were manipulated. Only those subjects who had practice categorizing cities into states showed a reduced symbolic distance effect for different-state pairs. Analyses of serial position curves indicated that categorization produced faster RTs to different-as compared with their adjacent same-state pairs and it also produced faster RTs for same-state pairs closer to the category border. The border seems to serve as an anchor and facilitates RTs. In Experiments 2a and 2b, distance judgments were made by subjects who either had or had not categorized artificial cities into states. Subjects who learned categories gave larger estimates of distance between cities belonging to different states than to cities belonging to the same state. Categorization seemed to place cities from different states farther apart in psychological space, making their locations more discriminable. This, along with the use of the category border as an anchor, might explain why categorization effects occur in this location judgment task.     

Social categorization and fit detection under cognitive load: efficient or effortful?

Participants perceived a discussion between members of two social categories in a name‐matching paradigm. Discussions either exhibited inter‐category fit, defined as a covariation of category membership and the category members' attitude positions, or not. Orthogonally, there was cognitive load at encoding, load at retrieval, or no concurrent load. Memory for the statements and memory for the speaker of a statement were affected by load with little evidence for fit effects. Conversely, category memory, reconstructive category guessing and perceived fit were affected by inter‐category fit with little evidence for load effects. The results suggest that category activation is sensitive to inter‐category fit and that fit detection is robust against moderate amounts of cognitive load. Copyright © 2005 John Wiley & Sons, Ltd.     

环境中的风险认知特征

采用多维度的心理测量范式,研究公众在“影响程度”、“可控性”、“了解程度”、“影响的持续性”、“发生的可能性”、“结果的严重性”六个维度上对39个环境条目的风险认知特征。研究结果验证了“风险程度指标”,并将环境风险划分为“生态环境”“疾病与灾害”“生活环境”三个大类并探讨其风险认知特征。结果显示,由“客观认识”和“主动作用”两维度形成的认知地图可有效地指导风险沟通。     

Computer-assisted analysis of conversation

Psychologists and linguists have employed computer programs to analyze written and spoken text. The Computer-Assisted Language Analysis System (CALAS) is a computer program that utilizes three sequential programs to parse the language of two speakers in a conversation into words, phrases, and clauses, and places verbs and nouns into categories derived from theories of case grammar. Rather than using a large “dictionary,” CALAS determines the category of each word on the basis of adjacent function words and placement of the words in the sentence. Output from CALAS lists the frequency of each category and can be used to construct measures of linguistic style and verb usage. Research employing CALAS includes the study of various types of psychotherapy, behavior therapy, classroom discourse, and literary texts.     

How context shapes category inferences and attribute preference for new ambiguous products

Extant research suggests that when marketers introduce products with functions that span multiple categories, consumers tend to generate beliefs in line with only a single category. This has been regarded as a major marketing challenge because it leads consumers to ignore key attributes from the product's supplementary category. Contrary to this prediction, the authors find that because consumers tend to classify new hybrid products by contrasting them against the competitive context, attributes from the supplementary category become more salient and thus contribute greater utility in choice. The authors pit the strength of this effect against several of the most dominant and favored category cues. The results confirm that classification inferences and attribute preference for new hybrid products are highly contextual, and as such, single category inferences need not translate directly into attribute preference.