Studies in thermal sensitivity: 16. Further evidence on the effects of stimulus temperature.

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Abstract
In amplification of an earlier study, seriatim mapping was conducted with temps. of 38[degree], 41[degree], 44[degree] and 47[degree] in random order to eliminate any effects of suggestion. The maps of the consistent subjects showed 77 different sequences of seriatim scores, with 4 different scores occurring in as small a number of cases as 4 alike. Statistically, with an increase of 3[degree] half of the scores remained unchanged, with 6[degree] 1/5 and with 9[degree] 1/10, regardless of the original score level or the original stimulating temp. Such results cannot be explained in terms of the traditional "spot" theory, but are in accordance with the concentration theory (1) each receptor is all-or-none in action; (2) receptors differ in their limens; (3) the seriatim score depends essentially upon the conc. of active receptors.

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