May 8, 2019

Individual difference in serial dependence results from opposite influences of perceptual choices and motor responses

BioRxiv : the Preprint Server for Biology
Huihui Zhang, David Alais

Abstract

Natural image statistics exhibit temporal regularities of slow changes and short-term correlations and visual perception, too, is biased towards recently seen stimuli, i.e., a positive serial dependence. Some studies report strong individual differences in serial dependence in perceptual decision making: some observers show positive serial effects, others repulsive effects, and some show no bias. To understand these contrasting results, this study separates the influences of physical stimuli per se , perceptual choices and motor responses on serial dependence in perceptual decision making. In two experiments, human observers reported which orientation (45° or −45°, at threshold contrast) they perceived. Experiment 1, used a consistent mapping between stimulus and response buttons while in Experiment 2, observers did two tasks: one with a consistent stimulus-response mapping, the other with a random stimulus-response mapping (perceptual choice and motor response unrelated). Results show that the stimulus percept (not the physical stimulus per se) affected subsequent perceptual choices in an attractive way, and that motor responses produced a repulsive serial effect. When the choice-response mapping was consistent (inseparable ch...Continue Reading

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Mentioned in this Paper

Study
Decision Making
Visual Perception
Response to Stimulus Physiology
Motor Function
Stimulus Sensing
Terminal Button Organization
Perception
Orientation (spatial)
Research Study

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