Cited by 257Hemispheric Asymmetry in NeuroscienceTactile and Sensory InteractionsSpatial Neglect and Hemispheric Dysfunction

Hemispheric lateralization of somatosensory processing

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Coghill, Robert C., Gilron, Ian, Iadarola, Michael J.·2001·Journal of Neurophysiology

Abstract

Processing of both painful and nonpainful somatosensory information is generally thought to be subserved by brain regions predominantly contralateral to the stimulated body region. However, lesions to right, but not left, posterior parietal cortex have been reported to produce a unilateral tactile neglect syndrome, suggesting that components of somatosensory information are preferentially processed in the right half of the brain. To better characterize right hemispheric lateralization of somatosensory processing, H 2 15 O positron emission tomography (PET) of cerebral blood flow was used to map brain activation produced by contact thermal stimulation of both the left and right arms of right-handed subjects. To allow direct assessment of the lateralization of activation, left- and right-sided stimuli were delivered during separate PET scans. Both innocuous (35°C) and painful (49°C) stimuli were employed to determine whether lateralized processing occurred in a manner related to perceived pain intensity. Subjects were also scanned during a nonstimulated rest condition to characterize activation that was not related to perceived pain intensity. Pain intensity-dependent and -independent changes in activation were identified in separate multiple regression analyses. Regardless of the side of stimulation, pain intensity–dependent activation was localized to contralateral regions of the primary somatosensory cortex, secondary somatosensory cortex, insular cortex, and bilateral regions of the cerebellum, putamen, thalamus, anterior cingulate cortex, and frontal operculum. No hemispheric lateralization of pain intensity–dependent processing was detected. In sharp contrast, portions of the thalamus, inferior parietal cortex (BA 40), dorsolateral prefrontal cortex (BA 9/46), and dorsal frontal cortex (BA 6) exhibited right lateralized activation during both innocuous and painful stimulation, regardless of the side of stimulation. Thus components of information arising from the body surface are processed, in part, by right lateralized systems analogous to those that process auditory and visual spatial information arising from extrapersonal space. Such right lateralized processing can account for the left somatosensory neglect arising from injury to brain regions within the right cerebral hemisphere.

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  1. COGHILL RC. Brain mechanisms supporting the pain experience: a distributed processing system. In: Pain 1999 -An Updated Review, edited by Max M. Seattle, WA: IASP, 1999.

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Authors
Coghill, R. C., Gilron, I., & Iadarola, M. J.
Affiliations
National Institutes of Health (US)
Venue
Journal of Neurophysiology
Published
2001-06-01
Volume
85
Issue
6
Pages
2602-2612
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W1896472419
Cited by
257
References
51
Citations by year
2026: 4 · 2025: 5 · 2024: 7 · 2023: 4 · 2022: 7 · 2021: 11 · 2020: 7 · 2019: 9 · 2018: 5 · 2017: 7 · 2016: 6 · 2015: 13 · 2014: 9 · 2013: 8 · 2012: 10
FWCI
7.16
Type
journal article
Language
en
Open access
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Hemispheric Asymmetry in Neuroscience
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Spatial Neglect and Hemispheric Dysfunction
Keywords
somatosensory processing, hemispheric lateralization, right hemisphere, pain intensity, thermal stimulation, posterior parietal cortex, primary somatosensory cortex, secondary somatosensory cortex, thalamus, insula, extrapersonal space, cerebral blood flow
MeSH terms
Adult, Attention, Cerebrovascular Circulation, Female, Humans, Functional Laterality, Male, Middle Aged, Psychophysics, Somatosensory Cortex, Thalamus, Tomography, Emission-Computed, Pain Threshold, Prefrontal Cortex

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