The time of perception as a measure of differences in sensations / by Vivian Allen Charles Henmon.

  • Henmon, Vivian Allen Charles (V. A. C.), 1877-
Date:
1906
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Licence: In copyright

Credit: The time of perception as a measure of differences in sensations / by Vivian Allen Charles Henmon. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    were those used by Brodhun. The curves show the same general characteristics as those of the three last-named investigators. The just noticeable differences which were taken as measure of sensitivity were approximately 2.2 times greater than the average errors of Konig and Dieterici and Brodhun. In the red end of the spectrum there appeared relatively smaller values than those of Konig and Dieterici, which may have been due to individual differences in the subjects. In order to show the relation of the results of the three last-mentioned researches to those obtained in this study a table is given of the results of Konig and Dieterici, Brodhun and Uthoff for the region of the spectrum lying between 610/i// and MOfifx, 650/i/z in the case of Uthoff. To facilitate comparison between my results and these, the average errors and just noticeable differences for the wave-lengths corre- sponding to the stimuli used in this research have been interpolated. These appear enclosed in parentheses. The interpolations are calcula- ted on the assumption that the line connecting the average errors and just noticeable differences of the separate wave-lengths is a straight one. This, while not strictly true, of course, gives a sufficiently close approximation to the real errors and differences for purposes of general comparison, which is all that is attempted. The table requires no other explanation than the statement that the second column, headed K“, gives the average errors as obtained on subject K in the research of Konig and Dieterici. The fourth column, headed K*, gives the errors obtained on the same subject in Brodhun’s research. Table V SUMMARY OF results FOR KONIG AND DIETERICI, BRODHUN AND UTHOFF FOR THE RED END OF SPECTRUM Wave-length. Av. E. D Av. K. K6 Av. E. U J. N. D. 65OfJ.fi 4.70 fifi 640 1.28fJ.fi 1.82 fifi 2.37 fifi 2.97 (639-5 1.278 1.803 2.32 2.90) (633-125 1.12 1-576 1-765 2.08) 630 1.05 1-47 1-35 1.68 (626.75 .92 1.316 1.125 1-58) (620.375 .686 1.015 .685 1-257) 620 .68 1.00 -67 1.24 (614 .608 .87 .60 1-145) 610 -56 .78 .55 1.08 The general tendency of the curve of sensitivity in these results is identical. The same tendency is shown in my results as the differ- ences in the times of perception have shown. It was pointed out