The statistical properties of the Survivor Interaction Contrast

The Survivor Interaction Contrast (SIC) is a powerful tool for assessing the architecture and stopping rule of a model of mental processes (Townsend & Nozawa, 1995). Despite its demonstrated utility, the methodology has lacked a method for statistical testing until now. In this paper we briefly describe the SIC then develop some basic statistical properties of the measure. These developments lead to a statistical test for rejecting certain classes of models based on the SIC. We verify these tests using simulated data, then demonstrate their use on data from a simple cognitive task.     

Age-related declines in general cognitive abilities of Balb/C mice are associated with disparities in working memory, body weight, and general activity

A defining characteristic of age-related cognitive decline is a deficit in general cognitive performance. Here we use a testing and analysis regimen that allows us to characterize the general learning abilities of young (3-5 mo old) and aged (19-21 mo old) male and female Balb/C mice. Animals' performance was assessed on a battery of seven diverse learning tasks. Aged animals exhibited deficits in five of the seven tasks and ranked significantly lower than their young counterparts in general learning abilities (aggregate performance across the battery of tasks). Aging added variability to common core performance (i.e., general learning ability), which translated into increased variability on the individual cognitive tasks. Relatedly, general learning abilities did not differ between the two ages among the best quartile of learners (i.e., cognitive abilities were spared in a subsample of the aged animals). Additionally, working memory capacity (resistance to interference) and duration (resistance to decay) accounted for significantly more of the variability in general learning abilities in aged relative to young animals. Tests of 15 noncognitive performance variables indicated that an increase in body weight (and an associated decrease in general activity) was characteristic of those aged animals which exhibited deficient general learning abilities. These results suggest the possibility that general cognitive deficits in aged animals reflect a failure of specific components of the working memory system, and may be related to variations in body weight and an associated decrease in activity.     

Studying visual search using systems factorial methodology with target-distractor similarity as the factor

Systems factorial technology (SFT) is a theory-driven set of methodologies oriented toward identification of basic mechanisms, such as parallel versus serial processing, of perception and cognition. Studies employing SFT in visual search with small display sizes have repeatedly shown decisive evidence for parallel processing. The first strong evidence for serial processing was recently found in short-term memory search, using target-distractor (T-D) similarity as a key experimental variable (Townsend & Fifi?, 2004). One of the major goals of the present study was to employ T-D similarity in visual search to learn whether this mode of manipulating processing speed would affect the parallel versus serial issue in that domain. The result was a surprising and regular departure from ordinary parallel or serial processing. The most plausible account at present relies on the notion of positively interacting parallel channels.     

PHYSICAL ACTIVITY IN HOMES 13 TEACHING EMPATHY SKILLS TO CHILDREN WITH AUTISM

The purpose of this study was to teach empathetic responding to 4 children with autism. Instructors presented vignettes with dolls and puppets demonstrating various types of affect and used prompt delay, modeling, manual prompts, behavioral rehearsals, and reinforcement to teach participants to perform empathy responses. Increases in empathetic responding occurred systematically with the introduction of treatment across all participants and response categories. Furthermore, responding generalized from training to nontraining probe stimuli for all participants. Generalization occurred from dolls and puppets to actual people in a nontraining setting for 2 participants. Generalization was observed initially to the nontraining people and setting for the other participants, but responding subsequently decreased to baseline levels. Introduction of treatment in this setting produced rapid acquisition of target skills.     

Successful Rebellious Professionals: The Black Woman's Professional Identity and Community Commitment

Using interview data from a larger career study of 25 black women who have achieved public recognition as workers for change in the black community, this paper explores the experiences of seven black professional women. The conflicts they confronted as black professionals, resolution of those conflicts, the special conditions of conflict resolution through rebellious professionalism, are explored, as well as the curious routes to success which place them in the position of role models to other human services professionals who are organizationally constrained from rebelling in such ways. The implications of these routes to professional success are explored in an effort to understand contemporary nationalism among black professionals and semi-professionals within the context of conflicts between dominant group organizational expectations and black community membership. The data suggest that particularistic commitments do not necessarily conflict with professional ideals if success is defined in terms of community achievements and positive evaluation by colleagues, rather than material rewards.     

Schema shifting: Children's cognitive monitoring of the prose-schema interaction in comprehension

Facility in shifting between familiar schemata in a listening comprehension task was examined in children from the third and sixth grades (8 and 11 years old, respectively). The children heard two consecutively presented ambiguous passages about very familiar daily activities. Comprehension of both passages demanded precisely timed activation of a schema appropriate to each passage. Half of the children were not explicitly cued to the passage shift, thus requiring that they spontaneously recognize the need for a schema shift. Analyses of free recall and interview responses showed that although the younger children had more difficulty than the older children, children at both grade levels demonstrated deficiencies in their cognitive monitoring of the prose-schema interaction.     

Feminist and sympathetic feminist consciousness

Data from the 1976 American National Election Study were used to assess the effects of one outgroup characteristic, belief similarity—dissimilarity, on the enhancement of women's feminist consciousness. Women were focused on as the ingroup and men as the outgroup. The sample consisted of 677 women who believed that women should have an equal role with men. Outgroup belief similarity referred to women's perception that most men supported an equal role for women and outgroup dissimilarity to the perception that men did not support an equal role. Results indicated that outgroup belief similarity significantly enhanced women's feminist consciousness. Women who supported an equal role and perceived outgroup belief dissimilarity scored higher on cognitive and behavioural measures of feminist consciousness than those who supported an equal role but did not perceive outgroup dissimilarity. Secondary analyses were undertaken assessing the effect of ingroup belief similarity dissimilarity on the enhancement of sympathetic feminist consciousness among men.     

Perceptual sampling of orthogonal straight line features

Summary Among mathematical models of visual confusion of letters and similar material, those that posit a feature detection process have been especially popular. The present study provides direct tests of several of the central assumptions of such models with feature-stimuli composed of the blank, one of two straight line features, or both line features positioned at a right angle. In one condition, the two features were connected when they appeared together, whereas in the other condition they were separated by a gap. A model which makes the strong assumptions that the features are sampled (detected) independently and then reported in a direct, unbiased fashion, performed acceptably in both conditions. Feature dependency models and those positing a biased decision process were ruled out on the basis of poor fits or lack of parsimony. The perceptibility (d) of a specific feature depended on the stimulus that contained it in the Gap condition but not in the Connected condition. The relative perceptibility of the horizontal vs in the vertical features was also different in the Gap vs Connected conditions. The results were compared with other recent studies, including ones in which sampling independence was falsified, apparently because of greater stimulus complexity, and employing a stimulus set that did not contain all possible combinations of features.We would like to thank J.T. Berning for help in conducting the experiments. The first and second authors were supported by NSF Grant #BNS 76-84053 and the third author by Purdue Research Foundation Grant #XR 0104 during the early portions of this research. The latter portions were aided by National Science Foundation Grant #BNS 79-20298 to the first author. The third author is now at Human Performance Center, Ohio State University, Columbus, Ohio 43210. Send for reprints to Dr. James T. Townsend, Department of Psychological Sciences, Purdue University, West Lafayette, Indiana 47907, USA