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Early visual deprivation alters multisensory processing in peripersonal space
Olivier Collignon1, Geneviève Charbonneau, Maryse Lassonde
1Université de Montréal, Centre de Recherche en Neuropsychologie et Cognition (CERNEC), Montreal, Canada. olivier.collignon@umontreal.ca
Neuropsychologia
|August 12, 2009
Summary
Early vision is crucial for developing multisensory peripersonal space. Without early sight, individuals struggle with combined audio-tactile processing, especially when hands are crossed.
Area of Science:
- Neuroscience
- Developmental Psychology
- Sensory Integration
Background:
- Multisensory peripersonal space develops through maturation, influenced by early sensory input.
- The role of vision in shaping audiotactile interactions within peripersonal space remains incompletely understood.
Purpose of the Study:
- To investigate the impact of early visual experience on the development of audiotactile interactions in peripersonal space.
- To examine how different sensory modalities (auditory, tactile) are integrated and how this integration is affected by posture (hands crossed vs. uncrossed).
Main Methods:
- Comparison of performance in early blind (EB), late blind (LB), and sighted control (SC) participants.
- Participants lateralized auditory, tactile, and audiotactile stimuli with hands uncrossed or crossed.
- Analysis of reaction times and summation effects (probability vs. nonlinear) to assess sensory integration.
Main Results:
- Crossed posture impaired tactile performance in sighted individuals but auditory performance in early blind individuals, suggesting a visually-driven spatial remapping.
- Sighted and late blind participants showed supra-additive audiotactile integration (neural integration) in both postures.
- Early blind participants exhibited supra-additive audiotactile integration only in the uncrossed posture, indicating difficulties with crossed-limb configurations.
Conclusions:
- Early visual experience is critical for the automatic spatial remapping of tactile and proprioceptive information into an external framework.
- The absence of early vision hinders the development of effective audiotactile interactions in peripersonal space, particularly in non-standard body configurations.
- These findings underscore the fundamental role of early vision in multisensory perception and action control within peripersonal space.
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