RODS AS COLOR RECEPTORS

The observance of color within the photochromatic interval has been shown to be possible. By pre-stimulating the subjects in a dark-adapted state, using Kodak Wratten Color Filters No. 70 (red), No. 73 (yellow) or No. 74 (green), and test-stimulating 30 sec. later with yellow, green, or blue filters at levels of intensity between the specific and absolute thresholds for these filters, it was found that they observed a blue or violet color.     

Multivariate thurstonian models

The recent development of probabilistic Thurstonian choice models for analyzing preference data has been motivated by the need to describe both inter- and intra-individual difference, the multidimensional nature of choice objects, and the effects of similarity and comparability among choice objects. A common feature of these models is that they focus on asingle preference judgment. It is customary, however, to ask subjects not only for an overall preference judgment but also for additional paired comparison responses regarding specific attributes. This paper proposes a generalization of Thurstonian probabilistic choice models for analyzing both multiple preference responses and their relationships. The approach is illustrated by modeling data from two multivariate preference experiments.I am grateful to James, Austin, Ingo Böckenholt, and anonymous referees for helpful comments on this research. This paper is based on research presented at the Meeting of the Society for the Multivariate Analysis in the Behavioral Sciences, Groningen, The Netherlands, December 1988.     

Estimating latent distributions in recurrent choice data

This paper introduces a flexible class of stochastic mixture models for the analysis and interpretation of individual differences in recurrent choice and other types of count data. These choice models are derived by specifying elements of the choice process at the individual level. Probability distributions are introduced to describe variations in the choice process among individuals and to obtain a representation of the aggregate choice behavior. Due to the explicit consideration of random effect sources, the choice models are parsimonious and readily interpretable. An easy to implement EM algorithm is presented for parameter estimation. Two applications illustrate the proposed approach.     

Relaxation versus cognitive therapies for dental fear--a psychophysiological approach.

By separating 127 adult dental-phobic patients according to fear etiology and psychophysiologic response style, the authors investigated the outcome of 2 dental fear treatments. Before and after either relaxation or cognitively oriented treatment, subjects were exposed to neutral and fear-relevant video sequences while the subjects' forehead muscle tension, heart rate, and skin conductance were recorded. Pre- to postintervention differences in self-reported dental fear, general fear, and trait anxiety were analyzed together with psychophysiological data. Both treatments resulted in a significant reduction of dental fear. Despite significant interaction effects of Treatment Modality x Psychophysiological Response Style, it could not be concluded that patients with different fear etiologies or response styles benefit differentially from the 2 treatments given.     

The Cognitive-Miser Response Model: Testing for Intuitive and Deliberate Reasoning

In a number of psychological studies, answers to reasoning vignettes have been shown to result from both intuitive and deliberate response processes. This paper utilizes a psychometric model to separate these two response tendencies. An experimental application shows that the proposed model facilitates the analysis of dual-process item responses and the assessment of individual-difference factors, as well as conditions that favor one response tendency over another one.     

A prelinguistic gestural universal of human communication

Several cognitive accounts of human communication argue for a language-independent, prelinguistic basis of human communication and language. The current study provides evidence for the universality of a prelinguistic gestural basis for human communication. We used a standardized, semi-natural elicitation procedure in seven very different cultures around the world to test for the existence of preverbal pointing in infants and their caregivers. Results were that by 10-14 months of age, infants and their caregivers pointed in all cultures in the same basic situation with similar frequencies and the same proto-typical morphology of the extended index finger. Infants' pointing was best predicted by age and caregiver pointing, but not by cultural group. Further analyses revealed a strong relation between the temporal unfolding of caregivers' and infants' pointing events, uncovering a structure of early prelinguistic gestural conversation. Findings support the existence of a gestural, language-independent universal of human communication that forms a culturally shared, prelinguistic basis for diversified linguistic communication.     

Reliability coefficients for multiple group item response theory models

Reliability of scores from psychological or educational assessments provides important information regarding the precision of measurement. The reliability of scores is however population dependent and may vary across groups. In item response theory, this population dependence can be attributed to differential item functioning or to differences in the latent distributions between groups and needs to be accounted for when estimating the reliability of scores for different groups. Here, we introduce group-specific and overall reliability coefficients for sum scores and maximum likelihood ability estimates defined by a multiple group item response theory model. We derive confidence intervals using asymptotic theory and evaluate the empirical properties of estimators and the confidence intervals in a simulation study. The results show that the estimators are largely unbiased and that the confidence intervals are accurate with moderately large sample sizes. We exemplify the approach with the Montreal Cognitive Assessment (MoCA) in two groups defined by education level and give recommendations for applied work.     

William Foote Whyte,Street Corner Society and Social Organization

Social scientists have mostly taken it for granted that William Foote Whyte's sociological classic Street Corner Society (SCS, 1943) belongs to the Chicago school of sociology's research tradition or that it is a relatively independent study which cannot be placed in any specific research tradition. Social science research has usually overlooked the fact that William Foote Whyte was educated in social anthropology at Harvard University, and was mainly influenced by Conrad M. Arensberg and W. Lloyd Warner. What I want to show, based on archival research, is that SCS cannot easily be said either to belong to the Chicago school's urban sociology or to be an independent study in departmental and idea‐historical terms. Instead, the work should be seen as part of A. R. Radcliffe‐Brown's and W. Lloyd Warner's comparative research projects in social anthropology.