Decision processes in verifying category membership statements: Implications for models of semantic memory

Current models of semantic memory assume that natural categories are well-defined. Specific predictions of two such models, the Smith, Shoben, and Rips (1974a) two-stage feature comparison model and the Glass and Holyoak (1974/75) ordered search model, were tested and disconfirmed in Experiment I. We propose an alternative model postulating fuzzy categories represented as sets of characteristic properties. This model, combined with a Bayesian decision process, accounts for the results of three additional experiments, as well as for the major findings in the semantic memory literature. We argue that people verify category membership statements by assessing similarity relations between concepts rather than by using information which logically specifies the truth value of the sentence. Our data also imply that natural categories are fuzzy rather than well-defined.     

Psychophysiologic correlates of Type A behavior: Comments on Houston (1983) and Holmes (1983)

On the basis of a literature review, B. K. Houston (1983, Journal of Research in Personality, 17, 22–39) concluded that there is a reliable but relatively weak association between Type A (coronary-prone) behavior and heightened physiologic reactivity. D. S. Holmes (1983, Journal of Research in Personality, 17, 40–47) contends that by failing to take into account dependent measures yielding null results, Houston overestimated the consistency with which A/B differences have been obtained. In the present article, we show that it is critical to take into account the method used to assess Type A behavior. Structured Interview assessments show a more consistent association with reactivity than those based on the Jenkins Activity Survey. We then point out that, for certain physiologic measures, null effects do not necessarily reflect an absence of A/B differences in sympathetic-adrenomedullary activity. Other issues that are discussed include the role of situational parameters in eliciting hyperresponsiveness in Type A's, the problem of evaluating the magnitude and importance of A/B effects, and the need for a more theoretical approach to the study of Type A behavior.     

Cognitive processing and cognitive ability: A multivariate validity investigation

What are the underlying sources of cognitive ability differences and of cognitive growth? Recent attention has focused on the experimental isolation of cognitive processing factors in the explanation of performance differences on complex tasks, and a number of research studies show a substantial relation between processing parameters and ability differences. Several validity issues—convergent process measures, differential ability prediction, and multiple levels of analysis—have not been addressed empirically, and these concerns are the focus of this study. Sixty eighth graders (30 F, 30 M) and 60 adults (30 F, 30 M) participated in verbal and spatial assessments, and in six experiments over two sessions. Three experiments were designed to estimate memory retrieval processing and three to estimate mental rotation processing. Two strategy parameters were derived also from these experiments. Within the processing tasks, there was modest convergence for eighth graders but negligible convergence for adults. More importantly, relationships between the processing parameters and the ability indices failed substantially to conform to the theoretically predicted convergent/discriminant pattern. Regression analyses also provided support for these disconforming patterns. The viability of explaining developmental and/or individual] differences using cognitive processing variance is explored.     

The logic of neuropsychological research and the problem of patient classification in aphasia

A critical analysis is presented of the assumptions that must be made to use the data from aphasia to constrain models of normal language processing. The implication of these assumptions for patient classification and research methodology in aphasia is considered.     

Lateral asymmetry in subgroups of dyslexic children

It has been proposed that in examining hemispheric dominance in dyslexics, investigators must make a distinction between subtypes of the disorder. Using the Denver Reading and Spelling Test, 72 dyslexics were divided into three groups: dysphonetics, dyseidetics, and nonspecifics. Three measures of hemispheric dominance were administered: a dichotic listening test, a hemiretinal test with linguistic stimuli, and a hemiretinal test with spatial stimuli. Results indicated that the three subgroups of dyslexics did not differ from one another on measures of hemispheric dominance. Dyslexics, taken as a group, tended to show an exaggerated right ear advantage on the dichotic listening test, in comparison with that of controls. It was proposed that the dichotic listening test may be confounded by attentional deficits in the dyslexics.     

Scrutinizing application: An agenda for applied developmental psychology

This paper dissects two views of application. The first is associated with an ontogenetic, general skills perspective which assumes that applications involve bringing to bear general concepts and principles on practical problems, deviant populations and the match between developing individuals and the environment they inhabit and use. However, that ontogenetic view and its associated applications may be flawed. A second functionalist view of application is described which suggests a need to examine the meaning of application and the contexts where applications are appropriate. Two questions might profitably be evaluated simultaneously: How does the developing individual gain access to relevant competencies and adapt them to new circumstances?, and How does the developmentalist decide what is relevant and usable for practice? A particular developmental curriculum fitting these views is described.     

Explaining the adult careers of dyslexic boys: Variations in critical skills for high-level jobs

Several hundred boys who were diagnosed as dyslexic (specifically reading disabled) in adolescence and who attended a private college preparatory school for dyslexics were followed up in adulthood. The occupations of these men, who were above average in both intelligence and socioeconomic background, were compared to those of both a control group and the general white male population. As hypothesized, the dyslexic men had higher level jobs than the average man but they were much less likely than the controls to become professionals. They rarely entered jobs such as physician, lawyer, or college teacher which require higher degrees; instead most became managers or salesmen. The occupational differences between the dyslexic and control men were related to, but not completely accounted for, by their large differences in educational attainment. Data on the competencies rated as critical to good job performance in different occupations were consistent with the hypothesis that dyslexic men would establish themselves in relatively high-level jobs emphasizing nonacademic rather than academic on-the-job skills. Nondisabled professionals rated getting information through reading among the most critical of the skills required on their jobs. In contrast, managers and salesmen rated reading as less important than nonacademic competencies such as taking initiative and responsibility or being persuasive. The results illustrate the value of knowing more about the particular competencies required in different jobs in order to help members of special groups, particularly those such as dyslexies who have specific and enduring handicaps but who are otherwise intellectually normal.     

Imagery,propositions, and the form of internal representations

This paper has four major sections: First, we review the basic arguments offered by Pylyshyn (Psychological Bulletin, 1973, 80, 1–24) and others against using imagery as an explanatory construct in psychology. Second, we consider each of these points and find none that speak against any but the most primitive notions of imagery. Third, we review the results of various experiments on imagery. In each case, we compare two explanations of the findings: one which assumes the existence of a surface image manifesting emergent properties, and one which assumes that all internal representations are coded in terms of “abstract propositions.” We find imagery hypotheses to be at least as adequate as those based on propositional representation. Finally, we conclude that debate about the ultimate foundations of internal representation is fruitless; the empirical question is whether images have properties that cannot be derived directly from more abstract propositional structures.