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Barognosis in a patient with hemiaraxia
Author(s) -
Angel Ronald W.
Publication year - 1980
Publication title -
annals of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.764
H-Index - 296
eISSN - 1531-8249
pISSN - 0364-5134
DOI - 10.1002/ana.410070113
Subject(s) - corollary , oscillation (cell signaling) , feeling , psychology , control theory (sociology) , audiology , mathematics , medicine , social psychology , computer science , control (management) , chemistry , combinatorics , artificial intelligence , biochemistry
Barognosis was tested in a patient who had a lesion of the right cerebellar hemisphere. While blindfolded, he used each hand to estimate the mass of given test loads, alternating hands between trials. he moved each load sinusoidally, comparing it with the previous one. The period of oscillation was found to be a linear function of the mass. With eah load, the period of oscillation was longer when he used the ataxic hand. On 23 of 59 comparisons between loads, the patient reported incorrectly. Ninety‐one percent of the errors were in the direction of loads feeling heavier when the ataxic hand was used. To explain these results, it is propsed that (1) the perceived magnitude of a load depends on the corollary discharge, and (2) cerebellar damage may reduce the accuracy of the corollary discharge.