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Somatotopic Specificity of Perceptual and Neurophysiological Changes Associated with Visuo-proprioceptive Realignment.
Mirdamadi, Jasmine L; Seigel, Courtney R; Husch, Stephen D; Block, Hannah J.
Affiliation
  • Mirdamadi JL; Program in Neuroscience, Indiana University Bloomington, Bloomington, IN 47405, USA.
  • Seigel CR; Department of Kinesiology, School of Public Health, Indiana University Bloomington, Bloomington, IN 47405, USA.
  • Husch SD; Program in Neuroscience, Indiana University Bloomington, Bloomington, IN 47405, USA.
  • Block HJ; Department of Kinesiology, School of Public Health, Indiana University Bloomington, Bloomington, IN 47405, USA.
Cereb Cortex ; 32(6): 1184-1199, 2022 03 04.
Article in En | MEDLINE | ID: mdl-34424950
When visual and proprioceptive estimates of hand position disagree (e.g., viewing the hand underwater), the brain realigns them to reduce mismatch. This perceptual change is reflected in primary motor cortex (M1) excitability, suggesting potential relevance for hand movement. Here, we asked whether fingertip visuo-proprioceptive misalignment affects only the brain's representation of that finger (somatotopically focal), or extends to other parts of the limb that would be needed to move the misaligned finger (somatotopically broad). In Experiments 1 and 2, before and after misaligned or veridical visuo-proprioceptive training at the index finger, we used transcranial magnetic stimulation to assess M1 representation of five hand and arm muscles. The index finger representation showed an association between M1 excitability and visuo-proprioceptive realignment, as did the pinkie finger representation to a lesser extent. Forearm flexors, forearm extensors, and biceps did not show any such relationship. In Experiment 3, participants indicated their proprioceptive estimate of the fingertip, knuckle, wrist, and elbow, before and after misalignment at the fingertip. Proprioceptive realignment at the knuckle, but not the wrist or elbow, was correlated with realignment at the fingertip. These results suggest the effects of visuo-proprioceptive mismatch are somatotopically focal in both sensory and motor domains.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Proprioception / Transcranial Magnetic Stimulation Type of study: Risk_factors_studies Limits: Humans Language: En Journal: Cereb Cortex Journal subject: CEREBRO Year: 2022 Document type: Article Affiliation country: United States Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Proprioception / Transcranial Magnetic Stimulation Type of study: Risk_factors_studies Limits: Humans Language: En Journal: Cereb Cortex Journal subject: CEREBRO Year: 2022 Document type: Article Affiliation country: United States Country of publication: United States