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Waving goodbye to contrast: self-generated hand movements attenuate visual sensitivity.
Madis Vasser1, Laurène Vuillaume2, Axel Cleeremans2
1Institute of Computer Science, University of Tartu, Estonia.
Neuroscience of Consciousness
|January 29, 2019
Summary
Human brain movement prediction causes sensory attenuation, reducing perceived stimulus contrast. This effect impacts basic sensory processing but not confidence judgments, supporting active inference theory.
Area of Science:
- Neuroscience
- Cognitive Science
- Perception
Background:
- The human brain predicts sensory consequences of body movements, leading to sensory attenuation.
- The precise mechanisms and scope of sensory attenuation remain under investigation.
Purpose of the Study:
- To investigate the effects of self-generated movements on sensory attenuation.
- To differentiate the impact of sensory attenuation on first-order sensitivity versus metacognitive monitoring.
Main Methods:
- Participants performed a contrast discrimination task in virtual reality.
- Visual stimuli were presented, with one potentially occluded by the participant's moving hand.
- First-order sensitivity and metacognitive confidence judgments were measured.
Main Results:
- Self-generated hand movements significantly reduced the perceived contrast of visual stimuli.
- Sensory attenuation was observed primarily in first-order sensitivity.
- Metacognitive monitoring, or confidence in judgments, was not affected.
Conclusions:
- Findings support active inference theory, explaining sensory attenuation through movement prediction.
- Sensory attenuation selectively impacts basic sensory processing, not higher-order confidence evaluation.
Keywords:
active inferencemetacognitionperceptionsensory attenuationsensory sensitivityvirtual realityMore Related Videos
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