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The implied motion aftereffect changes decisions, but not confidence.

Regan M Gallagher¹, Thomas Suddendorf², Derek H Arnold²

¹School of Psychology, The University of Queensland, Brisbane, QLD, Australia. regan.mathew@icloud.com.

Attention, Perception & Psychophysics

|August 24, 2021

Summary

Viewing still images can create a motion aftereffect, influencing direction perception. This study reveals implied motion aftereffects bias decision-making rather than altering core perceptual processing.

Keywords:

Confidence Decision-making Perceptual aftereffect Sensory adaptation

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Area of Science:

Cognitive psychology
Neuroscience
Visual perception

Background:

Motion aftereffects occur when viewing static images with implied motion, leading to perception of movement in the opposite direction.
It remains debated whether these aftereffects alter sensory perception or decision-making processes.

Purpose of the Study:

To differentiate between perceptual and decision-level changes in implied motion aftereffects.
To investigate the role of subjective confidence in understanding aftereffect mechanisms.

Main Methods:

Experiment 1: Assessed implied motion aftereffects using subjective confidence as a measure.
Experiment 2: Examined real motion aftereffects, comparing decisions and confidence.
Utilized subjective confidence ratings to infer the locus of aftereffect changes.

Main Results:

Implied motion aftereffects primarily influenced decision-making processes.
Subjective confidence remained unchanged in the implied motion condition, suggesting no perceptual alteration.
Real motion aftereffects affected both decisions and confidence, indicating perceptual changes.

Conclusions:

The implied motion aftereffect introduces a bias in decision-making, not a change in visual perception.
Distinguishing between perceptual and decision-level effects is crucial for understanding aftereffects.
Subjective confidence serves as a valuable tool for dissociating these processes.