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Orientational interactions between stationary and drifting gratings / Interactions orientationnelles entre des reseaux stationnaires et en mouvement.

Found that drifting gratings of high contrast masked stationary gratings at low spatial frequencies, whereas stationary gratings masked drifting gratings at higher spatial frequencies in experiments in which the authors served as Ss. The masking effects decreased with increases in the angle between the masking and test grating. The orientational effects were strongly attenuated in dichoptic vision. Orientational interactions between stationary and moving patterns occurred even where masking experiments failed to reveal them. Sub- and suprathreshold interactions between 2 orthogonal stimuli, one stationary and the other temporally modulated, were strongly asymmetrical. Subthreshold interactions between stationary and temporally modulated gratings of the same orientation were always facilitatory; this suggests that the sustained and transient mechanisms partially share a common information-processing stage. (29 ref) (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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