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A Continuous Illusion of Having a Sixth Finger
Denise Cadete1, Matthew R Longo1
1Department of Psychological Sciences, Birkbeck, University of London, United Kingdom.
Researchers created a continuous illusion of an extra sixth finger using multisensory stimulation. This demonstrates that the brain can enduringly represent supernumerary body parts, not just momentary confusion.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Body Representation
Background:
- The sense of self and personal identity are closely linked to our body.
- Multisensory illusions reveal the brain's flexible body representation.
- Previous research demonstrated embodiment of artificial or altered body parts.
Purpose of the Study:
- To replicate the novel six-finger illusion.
- To investigate if the illusion of a supernumerary finger can be sustained with continuous stimulation.
Main Methods:
- Utilized conflicting visual and tactile signals via a mirror box setup.
- Applied continuous multisensory stimulation to induce and maintain the illusion.
- Investigated the duration and nature of the embodied supernumerary finger perception.
Main Results:
- Successfully replicated the six-finger illusion.
- Demonstrated that the illusion of a sixth finger can be induced and maintained for an extended duration.
- Confirmed that continuous visual-tactile stimulation leads to a prolonged embodiment of a supernumerary finger.
Conclusions:
- The six-finger illusion is not solely due to momentary sensory conflict.
- The brain can form enduring representations of supernumerary body parts.
- This research advances our understanding of body ownership and multisensory integration.
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