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Article Dans Une Revue Vision Research Année : 2007

Temporal properties of the chromatic and achromatic Craik–O’Brien–Cornsweet effect

Résumé

The Craik-O'Brien-Cornsweet effect (COCE) is a visual illusion in which a difference in brightness is observed between two regions of equal luminance separated by a contrast edge with opposite luminance gradients on each side. The COCE also occurs with chromatic contrasts. It has been hypothesized that the COCE is mediated by a cortical filling-in process. According to the filling-in hypothesis, the filling-in or spreading of neural activity proceeds at finite speed, and therefore exhibits some temporal tuning as a function of the width of the area to be filled in. In the present study, observers varied the temporal frequency of a COC grating to determine the maximum temporal frequency at which a temporal modulation of brightness or color was perceived. In the achromatic COCE, contours were modulated along the luminance axis of the DKL color space; in the chromatic COCE, contours were modulated either along the L À M or the S À (L + M) axis. For the achromatic condition, the critical temporal frequency at which the COCE was still perceived had the shape of an inverted U, inconsistent with the filling-in hypothesis: the critical temporal frequency increased with increasing spatial frequency only up to 0.2 cycles/deg, but then decreased for higher spatial frequencies. For the chromatic COCE, the critical temporal frequency decreased with increasing spatial frequency, which is also inconsistent with filling-in. Thus, the results of the present study are inconsistent with the idea that the temporal dynamics of the COCE, both achromatic and chromatic, are due to filling-in. Instead, our results are consistent with the spatial filtering properties of the luminance and chromatic systems.
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Dates et versions

hal-04048572 , version 1 (10-05-2023)

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Frédéric Devinck, Thorsten Hansen, Karl R Gegenfurtner. Temporal properties of the chromatic and achromatic Craik–O’Brien–Cornsweet effect. Vision Research, 2007, 47, pp.3385 - 3393. ⟨10.1016/j.visres.2007.10.001⟩. ⟨hal-04048572⟩
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