We report a search for group differences in color experience between male and female subjects, focusing on the relative prominence of the axes of color space. Dissim-ilarity data were collected in the form of triadic (odd-one-out) judgments, made with the caps of the D-15 color deficiency test, with lighting conditions controlled. Multidi-mensional scaling reduced these judgments to a small number of dimensional-weight parameters, describing each sub-ject's sensitivity to color axes, i.e., how much each axis contributes to the inter-color dissimilarities perceived by each subject. Normal trichromatic subjects in two age bands were examined, teenagers and university students, and in both cases males placed significantly less weight on a 'red-green' axis, and more on 'lightness'. We consider the implications and possible explanations.
Color vision impairment was examined in patients with type 2 diabetes mellitus (DM2) without retinopathy. We assessed the type and degree of distortions of individual color spaces. DM2 patients (n = 32), and age-matched controls (n = 20) were tested using the Farnsworth D-15 and the Lanthony D-15d tests. In addition, subsets of caps from both tests were employed in a triadic procedure (Bimler & Kirkland, 2004). Matrices of inter-cap subjective dissimilarities were estimated from each subject's "odd-one-out" choices, and processed using non-metric multidimensional scaling. Two-dimensional color spaces, individual and group (DM2 patients; controls), were reconstructed, with the axes interpreted as the R/G and B/Y perceptual opponent systems. Compared to controls, patient results were not significant for the D-15 and D-15d. In contrast, in the triadic procedure the residual distances were significantly different compared to controls: right eye, P = 0.021, and left eye, P = 0.022. Color space configurations for the DM2 patients were compressed along the B/Y and R/G dimensions. The present findings agree with earlier studies demonstrating diffuse losses in early stages of DM2. The proposed method of testing uses color spaces to represent discrimination and provides more differentiated quantitative diagnosis, which may be interpreted as the perceptual color system affected. In addition, it enables the detection of very mild color vision impairment that is not captured by the D-15d test. Along with fundoscopy, individual color spaces may serve for monitoring early functional changes and thereby to support a treatment strategy.
A gender difference in color preference among British participants has been repeatedly reported, in which both males and females show a preference for blue-green colors, while females express an additional preference for pink-purple colors. To investigate the robustness of gender difference in color preference in a different culture, we tested 81 young adult Indians from a school of design and compared them to 80 young British students in Psychology. The 35-item International Personality Item Pool (IPIP) and Bem Sex Role Inventory (BSRI) questionnaires were also administered to explore possible links between personality traits, gender schemata, and color preferences. Results confirmed a gender difference in both cultures; participants collectively expressed a preference for cool over warm colors, while in addition females showed a preference for pink colors, with a warm bias for Indian females and a cool bias for British females. While these results extend gender difference to Indian culture and support the universality of an underlying pattern they also reveal a culture-specific contribution essentially observed in females. In British participants, color preference was correlated exclusively with BSRI scores in females and overwhelmingly with IPIP scores in males; this gender-specific pattern of correlation was not replicated in the Indian sample. Results point to an archetypal pattern of gender difference in color preference with a remarkable cross-cultural similarity in men and a subtle but significant cultural difference in women whose origin is yet to be explained. K E Y W O R D Scolor preference, cultural difference, gender difference, principal component analysis | I NT ROD UCTI ONIn context-free situations, people are willing to rank colors in order of preference or to indicate a preferred color out of several different options. However, studies are not unanimous as whether or not robust gender differences on color preference exist nor, if they do, the extent to which they are pancultural.
A combination of established and novel multivariate techniques was applied to the problem of school truancy. Informants described 104 truants they were acquainted with by ranking the applicability of 73 motives and causes for absence from school. Individual rankings were analyzed in the context of a multidimensional representation of the motives, derived from sorting data provided by other informants. Each ranking was interpreted as a three-dimensional vector within this “similarity space” and as a profile of 10 weights indicating the contributions of 10 “hotspots” (broad themes summarizing the motives) located in the space. The broad spectrum of motivational profiles was subdivided using clustering techniques. Five main relatively homogeneous clusters emerged, of which two cover a previously recognized pattern of parent-condoned truancy, whereas the other three are related to recognized syndromes of adolescent delinquency. There may be considerable differences between these clusters in terms of developmental antecedents, prognosis, and most effective form of intervention.
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