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Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
Published on: May 23, 2019
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Visual illusion of tool use recalibrates tactile perception
Luke E Miller1, Matthew R Longo2, Ayse P Saygin3
1Department of Cognitive Science, University of California, San Diego, United States; Kavli Institute for Brain and Mind, University of California, San Diego, United States.
Cognition
|February 16, 2017
Summary
Tool embodiment, or how tools become part of the body representation, can occur through visual illusions of tool use. This study shows visual cues, not just physical interaction, are key to tool embodiment.
Area of Science:
- Neuroscience
- Cognitive Science
- Human-Computer Interaction
Background:
- Tool embodiment, the integration of tools into the body's representation, is a known phenomenon.
- Previous research suggested active somatosensory and motor feedback are essential for embodiment.
- The boundary conditions and precise mechanisms driving tool embodiment remain unclear.
Purpose of the Study:
- To investigate the role of visual input in tool embodiment, challenging the necessity of active physical use.
- To determine if visual experience of tool use alone can induce recalibration of tactile perception.
- To explore the underlying mechanisms of tool embodiment, differentiating visual influence from other factors.
Main Methods:
- A mirror-based visual illusion was employed to simulate tool use with a stationary arm.
- Tactile perception recalibration was measured following the illusory tool use.
- Control conditions included illusory passive tool holding and analysis for sensory conflict or interhemispheric plasticity.
Main Results:
- Tactile perception was recalibrated on the stationary arm after illusory tool use, matching the magnitude of physical tool use.
- No recalibration occurred following illusory passive tool holding.
- The observed recalibration could not be explained by general sensory conflict or interhemispheric plasticity.
Conclusions:
- Visual signals of tool use play a critical role in driving tool embodiment.
- Active somatosensory and motor feedback may not be strictly necessary for tool embodiment.
- This finding broadens our understanding of the mechanisms underlying body representation and tool integration.
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