Thresholds for discriminating between the spatialphase relationship of the two component sinusoids ƒ and 3ƒ of a complex waveform were measured as a function of spatial frequency. Three experiments were conducted, yielding the following results. 1. Thresholds for relative phase were about 30° for all spatial frequencies at which both sinusoidal components were clearly visible. 2. The contrast threshold for discrimination of 180° of phase was as low as that for detection of the third harmonic. 3. Sensitivity to phase varies across the phase range, being best when one grating of the discrimination pair is seen to be in “square-wave” phase.
Sensitivity to spatialphase / D. C. Burr. - In: VISION RESEARCH. - ISSN 0042-6989. - STAMPA. - 20:(1980), pp. 391-395. [10.1016/0042-6989(80)90029-2]
Sensitivity to spatialphase
BURR, DAVID CHARLES
1980
Abstract
Thresholds for discriminating between the spatialphase relationship of the two component sinusoids ƒ and 3ƒ of a complex waveform were measured as a function of spatial frequency. Three experiments were conducted, yielding the following results. 1. Thresholds for relative phase were about 30° for all spatial frequencies at which both sinusoidal components were clearly visible. 2. The contrast threshold for discrimination of 180° of phase was as low as that for detection of the third harmonic. 3. Sensitivity to phase varies across the phase range, being best when one grating of the discrimination pair is seen to be in “square-wave” phase.
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