The sensory test about softness, thickness, fullness, and smoothness of pile fabric was analyzed as a function of strength of physical stimuli. The function obtained is expressed in the following equation, which is a different type from Weber-Fechner's law.
log
R=
AS+
Bwhere
R=response,
S=stimulus, and
A and
B=experimental constants.
From a set of sensory experiments conducted by a consumers group and a specialists group, it was found that there is a considerable difference in the recognizing behaviors of the consumers and of the specialists. The specialists generally take a time twice that for the consumers until reaching a decision. The fact suggests that the specialists behave more carefully on the sensory test. The specialists seem to have a relatively stable measure, when they compare a physical property of each sample with a given standard and make an order of strengths of the stimuli. It is of interest, however, that by a paired comparison, even a specialist is also much confused to order the strengths of stimuli as a usual consumer.
Using the intermediate differential and integral method, recognizing behaviors of specialists and of consumers were studied. Consumers seem to accept a physical stimulus directly, while specialists are likely to recognize a physical stimulus in a differentiated form. For instance, consumers estimate the thickness of fabric with the deformation of fabric itself generated by hand touching. And specialists tend to estimate the thickness by using an information about the deformation speed rather than the deformation value.
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