Ein photometrischer Apparat zu psychophysischen Zwecken [review-book]

J. J.
1889 American Journal of Psychology  
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more » ... out Early Journal Content at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. 334 334 334 PSYCHOLOGICAL LITERATURE. PSYCHOLOGICAL LITERATURE. PSYCHOLOGICAL LITERATURE. pressed down, thus stlpporting the weight attaehed to the other end. This downward pressllre is evidentlar a muscular efEort, even thouah the movement was only a few millimeters; and the resulting lralues seem to indieate a greater sensibilitv than the pure pressure-sense would give. By Ihaz ing three sueh beams, all three of the methods used with visual impressions eould be applied to this kind of touch sensations. The pressures were +aried from 1 gramme to 2000 grammes. The reslllts expressed, as those with sensatiolls of larightness, are as follows: (1) The sensibility increases as the stimulus inereases up to about 200 grammes, and from there to 2000 grammes is quite eonstant. (2) The senbsibility is finer (a) with suecessise than w-ith simultaneous impressions; (b) when mulseular sensibility is added to pressure sensations, than without the latter; (c) wllen the same finger is used for the variolls sensatiolls than wllen different fingers are used; (d) mhen the surfaee in eontaet is small tllan when it is large these points holding for all the methods of experimentation as well. (3) In the methodof doubles, the ratiosassigned as the double deerease as the stimuli increase. (4) By the method of mean gradations, the adjustments are much nearer the arithmetical than the geometrieal mean. (o) On the basis of the relatixrity hs puthesis and assuming that with the sensation of 1 gramme all the Istimulus is eonverted into sensation, then from 2()0 to 91)()() gramnzes only .114 to .163 of it is thus converted; and a not very diSerent result is obtainable from tlle other two methods svhen the effeets of eontrast are eliminated. This researeh is thus in opposition to several of the aeeepted generalizations of psyehophysics, an(l though some of tllis antagonism is more apparent than real, it will be a most delieate and diffieult work to bring unity and harmony into this most perplexing field of experimental psyehology. J. J. Ueber den Rhythmus centrter Reize. Dr. R. v. LIMBECK. Arehiv
doi:10.2307/1411818 fatcat:ejqg5grl2zg6tftol6gqxmlepm