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Feeling better: separate pathways for targeted enhancement of spatial and temporal touch
Jeffrey M Yau1, Pablo Celnik, Steven S Hsiao
1Johns Hopkins University School of Medicine.
Psychological Science
|January 7, 2014
Summary
Touch perception of spatial form and temporal frequency can be enhanced by stimulating visual and auditory cortex, respectively. This reveals distinct neural pathways for processing tactile information.
Area of Science:
- Neuroscience
- Sensory Processing
- Cortical Plasticity
Background:
- Humans perceive spatial and temporal information through touch via distinct somatosensory neurons.
- These neural populations are intermixed within the somatosensory system, complicating direct analysis.
Purpose of the Study:
- To investigate if tactile spatial and temporal perception can be dissociated.
- To determine if cross-modal cortical pathways influence tactile processing.
Main Methods:
- Anodal transcranial direct current stimulation (tDCS) was applied to visual and auditory cortices.
- Tactile perception of spatial orientation and temporal frequency was assessed before and after stimulation.
Main Results:
- tDCS over visual cortex enhanced tactile spatial perception.
- tDCS over auditory cortex enhanced tactile temporal perception.
- Stimulation of auditory cortex did not affect spatial perception, and visual cortex stimulation did not affect temporal perception, demonstrating a double dissociation.
Conclusions:
- Separate cortical pathways, typically associated with vision and audition, selectively process spatial and temporal aspects of touch.
- Sensory processing is not strictly modality-specific, supporting the concept of cross-modal integration.
- Supramodal domains may play a fundamental role in the brain's organizational principles.
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