Abstract
The rate of apparent change (RAC) was determined for the perceptual fluctuations which occur with a moving ambiguous figure. The RAC increased with viewing time, attaining a maximum after about 3 min. This increase of RAC with viewing time, during monocular observation, transferred 100 per cent to the contralateral eye. The complete interocular transfer indicates that the physiological process which causes perceptual fluctuations is not located in the retina but in a central pathway common to the two eyes. This physiological process appears to be a type of neural adaptation which affects a given perception only during the time when that perception is occurring. This central adaptation process is most dramatically demonstrated with ambiguous stimuli, because of the resulting perceptual rivalry, but the process probably operates to some extent in all visual sensations and perceptions. Its possible roˆle in other visual phenomena, such as the disappearance of stabilized retinal images, is discussed.
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