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In order to find out principal dimensions of touch, 50 samples of various texture, shape, size, and material, were collected.(1) Twenty haptic differential rating scales were applied to 50 samples and factor analyzed (S.D. touch).(2) Distance matrix constructed indirectly from the haptic profiles of 25 samples (selected from the 50) was analyzed by Torgerson-Indow's multi-dimensional scaling (MDS). Most important dimensions of tactual impressions are (i) heaviness and coldness (ii) wet and smoothness, and (iii) hardness. MDS yields nearly perfect one factor pattern. Metals and fibers are at the opposite poles.
Masaaki Yoshida (Mon,) studied this question.
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