May 1978
Volume 17, Issue 5
Articles  |   May 1978
A phase-specific adaptation effect of the square-wave grating.
Investigative Ophthalmology & Visual Science May 1978, Vol.17, 442-448. doi:
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      R V Sansbury, J Distelhorst, S Moore; A phase-specific adaptation effect of the square-wave grating.. Invest. Ophthalmol. Vis. Sci. 1978;17(5):442-448.

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      © ARVO (1962-2015); The Authors (2016-present)

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The existence of wide-band, phase-specific channels in the human visual system has been suggested in recent investigations. We used a number of adapting gratings to test for phase-specific adaptation effects. Observers were asked to discriminate between a simple 3 cpd sine-wave grating, (3), and a complex grating composed of this (3) plus a 9 cpd grating combined in one of two phases: peaks-subtract, (3,9:0), or peaks-add, (3,9:pi). The results show a significant phase-specific adaptation effect. That is, following adaptation to a square-wave grating, discrimination performance for (3,9:0) vs. (3) deteriorated significantly more than for (3,9:pi) vs. (3). Adaptation to the first two harmonics of the square-wave, (3,9:0), or a 3 cpd triangle-wave grating failed to produce phase-specific adaptation effects that reached significance.


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