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- W2115000788 abstract "Campbell Robson [ J. Physiol. (London)197, 551 ( 1968)] proposed that a near-threshold square-wave grating can be distinguished from a sine-wave grating of the same spatial frequency and fundamental amplitude when the channel tuned to the third-harmonic component of the square wave reaches its own threshold. To test this hypothesis, we measured waveform discrimination thresholds with two-interval forced-choice methods before and after 4-min adaptation to a high-contrast sine-wave grating, the spatial frequency of which equaled that of the square wave’s third harmonic. The results indicate that 3f adaptation has only a negligible effect on discrimination thresholds. In a further experiment, we adapted observers to both 3f and 5f harmonic frequencies of the square-wave test grating presented sequentially over 4 min. Although substantial threshold elevations occurred at the 3f and 5f frequencies, the elevation in waveform discrimination threshold was small. These results suggest that the independent-channel hypothesis alone cannot account for the visibility of complex features (edges) following harmonic adaptation." @default.
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- W2115000788 date "1988-10-01" @default.
- W2115000788 modified "2023-10-07" @default.
- W2115000788 title "Spatial waveform discrimination following higher-harmonic adaptation" @default.
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- W2115000788 doi "https://doi.org/10.1364/josaa.5.001744" @default.
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