Sensory and Attentional Components of Reaction Time:
Effects of the Size, Eccentricity and Predictability of Visual Stimuli
Keywords:
Visual attention, Eccentricity, Size, Reaction Time, PerceptionAbstract
Visual perception depends on the sensory framework and on attentional processing. This study examined the effects of the size, eccentricity and predictability of a visual stimulus on manual reaction time (RT). In experiment 1 (n=8), a target was presented randomly in one of four different eccentricities, with three possible sizes. Experiment 2 (n=12) had a similar configuration but a cue indicated the higher predictability (70%) of target presentation quadrant. The results showed an increase in RT as a function of target eccentricity, and a decrease in RT with increasing target size or accuracy of the cue. An analysis of interaction effects suggests an overlay of attentional and purely sensory mechanisms sharing common stages of visual processing.
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