Acquisition of hierarchical reactive skills in a unified cognitive architecture

In this paper, we review Icarus, a cognitive architecture that utilizes hierarchical skills and concepts for reactive execution in physical environments. In addition, we present two extensions to the framework. The first involves the incorporation of means-ends analysis, which lets the system compose known skills to solve novel problems. The second involves the storage of new skills that are based on successful means-ends traces. We report experimental studies of these mechanisms on three distinct domains. Our results suggest that the two methods interact to acquire useful skill hierarchies that generalize well and that reduce the effort required to handle new tasks. We conclude with a discussion of related work on learning and prospects for additional research, including extending the framework to cover developmental phenomena.     

No deficits in nonverbal memory, metamemory and internal as well as external source memory in obsessive-compulsive disorder (OCD)

A large body of literature suggests that some symptoms of obsessive-compulsive disorder (OCD) result from mnemonic dysfunctions. The present study tested various formulations of the memory deficit hypothesis considering important moderators, such as depression and response slowing. Thirty-two OCD patients and 32 healthy controls were presented verbal or nonverbal instructions for actions (e.g. simple gestures). These actions should either be performed or imagined. For recognition, previously presented as well as novel actions were displayed. Decisions had to be made whether an action was previously displayed (verbally vs. nonverbally) or not and whether an action was performed or imagined (internal source memory). Moreover, both judgments required confidence ratings. Groups did not differ in memory accuracy and metamemory for verbally presented material. Patients displayed some impairment for nonverbally presented material and imagined instructions, which, however, could be fully accounted for by response slowing and depressive symptoms. The study challenges the view that primary memory deficits underlie OCD or any of its subtypes. We claim that research should move forward from the mere study of objective impairment to the assessment of cognitive performance in conjunction with personality traits such as inflated responsibility.     

The Relations of Regulation and Emotionality to Children's Situational Empathy-Related Responding

The relations of dispositional regulation (attentional control, ego control), ego resiliency, and emotionality (general emotional intensity and negative emotionality) to situational measures of sympathy and personal distress were examined. Situational sympathy and personal distress were assessed with facial, self-reported, and heart rate reactions to an empathy-inducing film. Teachers and parents completed measures of children's dispositional regulation and emotionality. In general, children who evidenced sympathy (e.g., facial sadness, mean heart rate decline, and self-reported sympathy) were rated higher in regulation and resiliency, although findings sometimes were obtained for only one sex. Children who evidenced personal distress (e.g., facial distress), as well as facial sadness, were rated relatively high in emotionality. Gaze aversion from the film was correlated with regulation and boys' resiliency, and was negatively related to negative emotionality.     

Cover, Copy, and Compare: A Self-Managed Academic Intervention Effective Across Skills, Students, and Settings

Cover, Copy, and Compare (CCC) is a simple, efficient, self-managed academic intervention that can be used to improve accuracy, fluency, and maintenance across students, curricula objectives, academic skill domains, and settings. In it's simplest form CCC requires students to look at an academic stimulus (e.g., for spelling the stimulus would be a written a word) cover the stimulus, respond by copying the stimulus (e.g., writing the word), and evaluate the responses by comparing it to the original stimulus. The CCC procedure and research that supports the generalizability and ecological validity of this procedure is described and analyzed. Following this analysis, recommendations for implementing Cover, Copy, and Compare in educational settings are provided.     

Exploring the space of cognitive architectures

Production systems have been proposed as a candidate for the basic architecture of the human information processor. We consider a number of dimensions along which production systems can vary, and we discuss PRISM, a production system formalism designed to aid cognitive modelers in their exploration of the space of architectures. Examples of PRISM settings are presented in the context of particular models. Finally, some heuristics are suggested for efficiently searching the space of possible architectures.     

Affect intensity and the appraisal of emotion

The present study investigated the association between a personality trait known as affect intensity and the perceived qualities of emotions. Subjects completed the Affect Intensity Measure (AIM), and they rated the phenomenological qualities and causal dimensions of previous emotional experiences involving happiness, pride, anxiety, and hate. The results showed that high and low scorers on the AIM reported different perceptions of certain qualities of the emotional event, independent of the emotion's valence; subjects with high scores on the AIM rated their emotions as higher in intensity, frequency, and vividness of recall. In contrast, further analyses revealed little relation between AIM scores and causal dimension ratings of the emotions. However, within-subject analyses indicated that the emotions did differ in their perceived causes, thus supporting predictions from Weiner's attributional model of emotion. The results are discussed in terms of the need for a complex approach to the study of emotion which incorporates intersubject and intrasubject differences.     

Computer control of memory experiments on a large-scale timesharing system

This paper describes a computer system for running verbal learning and memory experiments using a large-scale timesharing computer. Its application is illustrated by control programs used to set up, execute, and analyze a series of interactive free recall experiments. While limitations of timesharing systems for experimental control surely exist, they can often be removed by simple hardware or software. Further, a large machine can provide significant advantages in cost and software development over dedicated laboratory minicomputers. It is possible to obtain the advantages of both types of systems by introducing local intelligence to provide more precise timing and flexible control of experimental devices, while retaining the power and hardware and software resources of the large machine.     

Achievement and adjustment correlates of the matching familiar figures test

To help clarify the relationship between the Matching Familiar Figures (MFF) Test and measures of school achievement and adjustment, 450 children from kindergarten, second, and fifth grades were tested and achievement scores and teacher's ratings of classroom and personal adjustment were obtained. Regardless of grades, MFF latency in most instances did not predict achievement or adjustment. At the kindergarten level the correlations between MFF errors and both achievement and adjustment were significant for most subscales but at second grade correlations were lower and generally nonsignificant except for a few adjustment items. At the fifth grade level the correlations were moderately high but when IQ was partialled out the correlations with achievement and school adjustment dropped to near zero; however, partialling out IQ did not affect the moderate correlations between errors and personal adjustment. The errors score evidencedmore important relationships than the latency scores. The relationship between the MFF and ratings of social and emotional adjustment was consistently higher than the correlations between the MFF and achievement. These results suggest that MFF errors are personalogically relevant and that MFF performance is generally more related to adjustment than achievement.