Kirschmann, A: University of Toronto Studies, Vol. 1

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Kirschmann, A: University of Toronto Studies, Vol. 1

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O knihe

Excerpt from University of Toronto Studies, Vol. 1: Psychological Series

The field of optical contrast is of great extent and includes a considerable variety of distinguishable in¿uences. It will be neces sary to discriminate between them both for the purpose of investi gating the bearing of contrast upon the problem in hand, and in order to define the particular kind of contrast with which we are concerned. Optical contrast has been divided into successive and simultaneous contrast. The former, successive contrast, is identical with the phenomenon of after-images. If one turns away after look ing at a dark surface on a bright ground, one will have a series of alternating positive and negative after-images, in the latter of which the ground will appear dark and the dark surface bright. This inver sion of the relationship between surface and ground in the negative after-image is a case of so-called successive contrast. That part of the object of consciousness which at one moment was bright appears at a subsequent moment dark, and the dark portion appears bright, a fact which seems to indicate that the relationship between the parts of the after-images in respect to brightness is inversely dependent'

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