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Hypersensitivity to pain in congenital blindness

Slimani, Hocine and Danti, Sabrina and Ricciardi, Emiliano and Pietrini, Pietro and Ptito, Maurice and Kupers, Ron Hypersensitivity to pain in congenital blindness. Pain, 154 (10). pp. 1973-1978. ISSN 0304-3959 (2013)

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Vision is important for avoiding encounters with objects in the environment that may imperil physical integrity. We tested whether, in the absence of vision, a lower pain threshold would arise from an adaptive shift to other sensory channels. We therefore measured heat and cold pain thresholds and responses to suprathreshold heat stimuli in 2 groups of congenitally blind and matched normal‐sighted participants. We also assessed detection thresholds for innocuous warmth and cold, and participants’ attitude toward painful encounters in daily life. Our results show that, compared to sighted subjects, congenitally blind subjects have lower heat pain thresholds, rate suprathreshold heat pain stimuli as more painful, and have increased sensitivity for cold pain stimuli. Thresholds for nonpainful thermal stimulation did not differ between groups. The results of the pain questionnaires further indicated that blind subjects are more attentive to signals of external threats. These findings indicate that the absence of vision from birth induces a hypersensitivity to painful stimuli, lending new support to a model of sensory integration of vision and pain processing.

Item Type: Article
Identification Number: 10.1016/j.pain.2013.05.036
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Research Area: Computer Science and Applications
Depositing User: Users 72 not found.
Date Deposited: 11 Nov 2015 15:27
Last Modified: 13 Sep 2016 09:47
URI: http://eprints.imtlucca.it/id/eprint/2893

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