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Brain, Vol. 118, No. 2, 395-399, 1995
© 1995 Oxford University Press

research-article

Intramodal somaesthetic recognition disorders following right and left hemisphere damage

Gabriella Bottini1, Stefano F. Cappa2, Roberto Sterzi1 and Luigi A. Vignolo2,

1Division Neurologia, Ospedale Niguarda Milano 2Clinica Neurologica della Università Brescia, Italy

Correspondence to: Correspondence to: Professor L. A. Vignolo, Clinica Neurologica della Università (Divisione Neurologica II), c/o Spedali Civili, P. le Ospedale, 25125 Brescia, Italy

A dissociation between apperceptive and associative processing after right and left hemisphere damage, respectively, has been suggested for visual, auditory and visuo-tactile matching tasks. This study was aimed at testing for this dissociation in a purely somaesthetic task. Forty consecutive patients with recent right and left hemispheric vascular lesions and 10 normal controls were studied. The groups were compared on two intramodal somaesthetic matching tasks, consisting of either meaningless shapes (apperceptive recognition) or meaningful objects (associative recognition). In normal controls, no significant difference was found either between the two tests, indicating a similar degree of difficulty, or between hands. An analysis of variance indicated a differential impairment of the two hemisphere-damaged groups on the two tests in comparison with normal controls. Right hemisphere lesions impaired the apperceptive, but not the associative, task, while the reverse occurred after left hemisphere lesions. This double dissociation between side of hemispheric lesion (right and left) and level of recognition impairment (apperceptive and associative) extends the results reported for other sensory modalities to intramodal tactile recognition matching.

somaesthesis; hemispheric specialization; tactile agnosia; aphasia

Received October 12, 1994. Accepted November 21, 1994.


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