Letter | Published:

Some New Subjective Phenomena Apparently Due to Interocular Transfer


THERE has been a long dispute as to whether visual after-images arise retinally or centrally. An after-image produced in one eye may be seen as if with the other when that alone is open1. This transfer of after-images may be due to a persisting central change produced by stimulation of the one eye, or by after-discharge from the stimulated eye being seen as though it arose from the non-stimulated eye. Both mechanisms may be operating but it has never been possible conclusively to dissociate the two possibilities under these conditions.

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  1. 1

    Sumner, F. C., and Watts, F. P., Amer. J. Psychol., 48, 109 (1936).

  2. 2

    Craik, K. J. W., Nature, 145, 512 (1940).

  3. 3

    MacKay, D. M., Nature, 180, 849 (1957).

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