Cyclovergence: a comparison of objective and psychophysical measurements.

Cyclovergence: a comparison of objective and psychophysical measurements. Research Abstract Details 

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Cyclovergence: a comparison of objective and psychophysical measurements. Abstract Text:

I P Howard,M Ohmi,L Sun,

Several psychophysical procedures have been used to measure cyclovergence but none has been adequately validated with respect to an objective measure. Scleral search coils were used to measure cyclovergence induced by dichoptic textured patterns which cyclorotated in antiphase through 6 degrees at frequencies between 0.05 and 2 Hz. In one psychophysical procedure subjects nulled the apparent oscillatory motion of radial nonius lines superimposed on a small black disc at the center of a large cyclorotating display. In the second, subjects nulled the apparent inclination in depth of a vertical line displayed in the same way. The amplitude of cyclovergence measured objectively and the magnitude of oscillation of the nonius lines were similar at low stimulus frequencies. At higher frequencies of cyclorotation, both amplitudes declined but the nonius amplitude exceeded that of cyclovergence. The apparent inclination of the vertical test line, as indicated by the nulling procedure, also declined with increasing frequency of cyclorotation, but not at the same rate. At low frequencies, the apparent inclination of the test line was greater than that corresponding to the cyclodisparity induced into the line and almost as great as that corresponding to the relative disparity between the oscillating pattern and the line. The implications of these results for measuring cyclovergence and for an understanding of stimuli driving cyclovergence and perceived inclination in depth are discussed.

Cyclovergence: a comparison of objective and psychophysical measurements. Publishing Authors By Initials

IP Howard,M Ohmi,L Sun,

For similar psychological phenomena and processes: mental processes: perception: visual perception research abstracts see: psychological phenomena and processes: mental processes: perception: visual perception research

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Cyclovergence: a comparison of objective and psychophysical measurements. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 97

Page Numbers: 349-55

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ISSN: 0014-4819

DAY: 15

MONTH: 02

YEAR: 1993

Cyclovergence: a comparison of objective and psychophysical measurements. Information

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LANGUAGE: eng

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Cyclovergence: a comparison of objective and psychophysical measurements. Keywords Mesh Terms:

KEYWORDS: Visual Perception

MESH TERMS: physiology

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Grant and Affiliation Information for Cyclovergence: a comparison of objective and psychophysical measurements.

AFFILIATION: Centre for Vision Research, York University, Ontario, Canada.

Country: GERMANY

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MEDLINETA: Exp Brain Res

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