Transfer of tactile perceptual learning to untrained neighboring fingers reflects natural use relationships

Dempsey-Jones, Harriet, Harrar, Vanessa, Oliver, Jonathan, Johansen-Berg, Heidi, Spence, Charles and Makin, Tamar R. (2016) Transfer of tactile perceptual learning to untrained neighboring fingers reflects natural use relationships. Journal of Neurophysiology, 115 3: 1088-1097. doi:10.1152/jn.00181.2015

Author Dempsey-Jones, Harriet
Harrar, Vanessa
Oliver, Jonathan
Johansen-Berg, Heidi
Spence, Charles
Makin, Tamar R.
Title Transfer of tactile perceptual learning to untrained neighboring fingers reflects natural use relationships
Journal name Journal of Neurophysiology   Check publisher's open access policy
ISSN 0022-3077
Publication date 2016-03-01
Year available 2016
Sub-type Article (original research)
DOI 10.1152/jn.00181.2015
Open Access Status DOI
Volume 115
Issue 3
Start page 1088
End page 1097
Total pages 10
Place of publication Bethesda, MD, United States
Publisher American Physiological Society
Collection year 2017
Language eng
Abstract Tactile learning transfers from trained to untrained fingers in a pattern that reflects overlap between the representations of fingers in the somatosensory system (e.g., neurons with multifinger receptive fields). While physical proximity on the body is known to determine the topography of somatosensory representations, tactile coactivation is also an established organizing principle of somatosensory topography. In this study we investigated whether tactile coactivation, induced by habitual inter-finger cooperative use (use pattern), shapes inter-finger overlap. To this end, we used psychophysics to compare the transfer of tactile learning from the middle finger to its adjacent fingers. This allowed us to compare transfer to two fingers that are both physically and cortically adjacent to the middle finger but have differing use patterns. Specifically, the middle finger is used more frequently with the ring than with the index finger. We predicted this should lead to greater representational overlap between the former than the latter pair. Furthermore, this difference in overlap should be reflected in differential learning transfer from the middle to index vs. ring fingers. Subsequently, we predicted temporary learning-related changes in the middle finger's representation (e.g., cortical magnification) would cause transient interference in perceptual thresholds of the ring, but not the index, finger. Supporting this, longitudinal analysis revealed a divergence where learning transfer was fast to the index finger but relatively delayed to the ring finger. Our results support the theory that tactile coactivation patterns between digits affect their topographic relationships. Our findings emphasize how action shapes perception and somatosensory organization.
Keyword Perceptual learning
Primary somatosensory cortex
Primary somatosensory cortex
Repetitive Strain Injury
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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