Rose D, Bradshaw M F, Hibbard P B, 2000, "Attentional effects on depth and direction aftereffects" Perception 29 ECVP Abstract Supplement
Attentional effects on depth and direction aftereffects
D Rose, M F Bradshaw, P B Hibbard
The perceptions of depth from binocular disparity and motion parallax are typically considered to be low-level pre-attentive processes. In the motion domain, however, such a view was rejected by Chaudhuri [1990 Nature (London) 344 60 - 62] who showed that the motion aftereffect could be modulated by a secondary attentional task.
Here we investigate (i) whether the duration of depth aftereffects (Blakemore and Julesz, 1971 Science 171 286 - 288) is also affected by attention, (ii) the relative effects of a secondary task on disparity and motion aftereffects, and (iii) whether attention can modulate the outcome of a disparity-motion-contingent aftereffect (Anstis and Harris, 1974 Perception 3 153 - 168). Subjects adapted to stationary and/or moving random-dot patterns forming one or more depth planes while attention was manipulated with a secondary task (character processing at parametrically varied rates).
We found that the depth aftereffect could be affected by attentional manipulations, and both its duration and that of the motion aftereffect varied monotonically with the difficulty of the secondary task. Pre-cueing attention to one aspect of the disparity-motion stimulus (a direction or depth) affected the nature of the aftereffect obtained despite the fact that the visual stimulation remained the same.
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