Comparisons between exemplar similarity and mixed prototype models using a linearly separable category structure

Nosofsky and Zaki (2002) found that an exemplar similarity model provided better accounts of individual subject classification and generalization performance than did a mixed prototype model proposed by Smith and Minda (1998; Minda & Smith, 2001). However, these previous tests used a nonlinearly separable category structure. In the present work, the authors extend the previous findings by demonstrating a superiority for the exemplar generalization model over the mixed prototype model in a case involving a linearly separable structure. Because this structure has numerous features that Minda and Smith argued should be conducive to prototype-based processing, the results pose a significant challenge to the mixed prototype view.     

The Emerging Study of Positive Empathy

Lay intuitions suggest that the ability to share, celebrate, and enjoy others' positive emotions – a phenomenon we term positive empathy – bolsters individual well‐being and relationship strength. However, it is unclear from the current literature whether (i) positive empathy is distinct from highly related constructs and (ii) whether positive empathy is associated with salutary social and personal outcomes. Here, we begin by examining basic evidence suggesting that positive empathy is related to, but independent from, constructs such as general positivity and empathy for others' distress. We then review evidence that positive empathy correlates with increased prosocial behavior, social closeness, and well‐being. Lastly, we discuss open directions for the study of positive empathy, such as investigating the potential role of positive empathy (or its disruption) in psychiatric disorders.     

A WORKER MOTIVATION SCALE

A 70 item questionnaire was constructed using the rationale of several current value/expectancy theories of motivation and the results of two prior factor analyses of motivation items. It was completed anonymously by 240 employed adults in 35 organizations and the resulting factor analysis yielded a hierarchical structure of motivation and eight reliable subscales. Direct and indirect criterion measures also obtained via the questionnaire and covering job characteristics/components; satisfaction (need) levels for n ach, n affil, n power ; the four elements of Heider's attribution theory of motivation; and salary, education and job classification were used to validate the subscales. Support for the criteria was found and promising validities were indicated. Lastly, personal, job and organizational variables were included with the motivation subscales and criteria in a subsequent factor analysis to examine moderator effects of the obtained validities. Results are discussed in terms of motivation theories, validities, moderator effects in study designs, and future use of the questionnaire by other researchers with business-industrial samples.     

A single-system interpretation of dissociations between recognition and categorization in a task involving object-like stimuli

In previous research (Reed, Squire, Patalano, Smith, & Jonides, 1999), amnesic patients performed at near normal levels in a categorization task involving stimuli with discrete features, but showed impaired recall of the features. These results were taken as evidence of the existence of separate memory systems for categorization and recall/recognition. The present research addresses a single-system account of this dissociation. In Experiment 1, results closely matching the dissociation pattern were obtained when normal participants' classification and recognition performance was tested either immediately or after a week delay. In addition, formal modeling of the data suggested that participants use only a few of the dimensions in the categorization task, whereas they must use many dimensions in the cued-recall task. In Experiment 2, we found that many participants could perform the categorization task without any exposure to the training sequence. These results suggest that different memory demands across the two tasks may be responsible for the observed dissociation—separate memory systems are not necessarily involved.     

Dissociations Between Categorization and Recognition in Amnesic and Normal Individuals: An Exemplar-Based Interpretation

In recent work, the finding of dissociations between categorization and recognition in amnesic and normal individuals has been taken as evidence of multiple memory systems mediating these tasks. The present research provides support for the alternative idea that these dissociations can be interpreted in terms of a single-system exemplar-memory model that makes allowance for parameter differences across groups. In one experiment, a parameter change in memory sensitivity was induced by testing classification and recognition at varying delays; the results closely matched the ones observed by Knowlton and Squire (1993) for normal and amnesic participants. The exemplar model also yielded good quantitative predictions of the categorization-recognition dissociation. A second analysis demonstrated that dissociations between early versus late probabilistic classification learning and memory sensitivity were also well predicted by the single-system exemplar model. Limitations of the exemplar interpretation and future research directions are also discussed.     

WHAT IS PURE,WHAT IS GOOD? DISINTERESTEDNESS IN FÉNELON AND KANT

Two philosophers, Robert Spaemann and Henri Gouhier, have identified a similarity between Fénelon and Kant in the prominence of motive in their thought: disinterestedness in Fénelon's pure love and in Kant's good will . Spaemann emphasizes their common detaching of the ethical in terms of motivation from the context of happiness. In this article I explore further similarities and differences under the topics of perfectionism, pure love, good will, happiness, and disinterestedness, as these are pertinent to their thought. On perfectionism there appears a stark contrast; on pure love over against good will, on happiness, and on disinterestedness, however, there seems a balance between likenesses and differences. Finally I point out a qualification set on pure love by Fénelon and on the good will by Kant.     

A hybrid-similarity exemplar model for predicting distinctiveness effects in perceptual old-new recognition

In 2 sets of experiments, the authors investigated the basis for old-item distinctiveness effects in perceptual recognition, whereby distinctive old items are recognized with higher probability than are typical old items. In Experiment 1, distinctive old items were defined as those lying in isolated regions of a continuous-dimension similarity space. In this case, any beneficial effects of distinctiveness were absent or small, regardless of the structure of the test list used to assess recognition memory. In Experiment 2, distinctive items were defined as those objects containing certain discrete, individuating features. In this case, large old-item distinctive effects were observed, with the nature of the effects being modulated by the structure of the test lists. A hybrid-similarity exemplar model, combining elements of continuous-dimension distance and discrete-feature matching, was used to account for these distinctiveness effects in the recognition data.     

Procedural interference in perceptual classification: Implicit learning or cognitive complexity?

Researchers have argued that an implicit procedural-learning system underlies performance for information integration category structures, whereas a separate explicit system underlies performance for rule-based categories. One source of evidence is a dissociation in which procedural interference harms performance in information integration structures, but not in rule-based ones. The present research provides evidence that some form of overall difficulty or category complexity lies at the root of the dissociation. The authors report studies in which procedural interference is observed for even simple rule-based structures under more sensitive testing conditions. Furthermore, the magnitude of the interference is large when the nature of the rule is made more complex. By contrast, the magnitude of interference is greatly reduced for an information integration structure that is cognitively simple. These results challenge the view that a procedural-learning system mediates performance on information integration categories, but not on rule-based ones.