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Journal Article

Citation

Heuer H, Wischmeyer E, Bruwer M, Romer T. J. Exp. Psychol. Hum. Percept. Perform. 1991; 17(1): 232-245.

Affiliation

Fachbereich Psychologie der Philipps-Universität Marburg, Federal Republic of Germany.

Copyright

(Copyright © 1991, American Psychological Association)

DOI

unavailable

PMID

1826314

Abstract

The hypothesis was tested that the decline of apparent size with elevated gaze results from a latent tendency of the eyes to diverge and thus increased vergence effort. Through the use of a method of category estimation, the decline of apparent size on elevation or depression of gaze was found not to be different between subjects with larger or smaller changes of dark vergence and thus vergence effort. In a 2nd experiment, vergence effort was varied by varying gaze elevation and the angle of convergence. With vergence effort constant, apparent size was dependent on the angle of convergence rather than being constant. It is concluded that apparent size does not depend on vergence effort and that the effect of gaze elevation on apparent size cannot be attributed to its concomitant effect on dark vergence.


Language: en

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