Abstract
In his original contribution, Exner’s principal concern was a comparison between the properties of different aftereffects, and particularly to determine whether aftereffects of motion were similar to those of color and whether they could be encompassed within a unified physiological framework. Despite the fact that he was unable to answer his main question, there are some excellent—so far unknown—contributions in Exner’s paper. For example, he describes observations that can be related to binocular interaction, not only in motion aftereffects but also in rivalry. To the best of our knowledge, Exner provides the first description of binocular rivalry induced by differently moving patterns in each eye, for motion as well as for their aftereffects. Moreover, apart from several known, but beautifully addressed, phenomena he makes a clear distinction between motion in depth based on stimulus properties and motion in depth based on the interpretation of motion. That is, the experience of movement, as distinct from the perception of movement. The experience, unlike the perception, did not result in a motion aftereffect in depth.
Highlights
One cannot understand the current status of a research field without having knowledge about its history
In the context of the motion aftereffect (MAE See Wade, 1994; Mather et al, 1998; Wade & Verstraten, 2005), it was to determine where it originates and how it compares to other aftereffects like those for luminance and color
When I closed one eye, the letters showed the aftereffect corresponding to that of the retinal image motion of the needles, they moved from left to right for the right eye, and from right to left for the left eye, this is because the needle images brushed the retinas in opposite directions. It happens on monocular viewing of the printed page that rivalry of the visual fields shows up, at least in so far that parts of the perceived field moved in one direction, corresponding to the aftereffect of the closed eye, while other parts appeared to drift in the opposite direction
Summary
One cannot understand the current status of a research field without having knowledge about its history. 4. If one fixates the center of the moving drum (or a suitable marker placed just in front of it) with the right eye for a minute, subsequently stops the drum, and closes the right and opens the left eye at the same time, a negative movement aftereffect is experienced in the latter eye at the fixated lines.
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