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A comparison of primary afferent and cortical neurone activity coding sinus hair movements in the cat

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Summary

Responses in the somatosensory cortical area S I to stimulation of facial sinus hairs were recorded in the anaesthetized cat and compared with activity in primary afferent fibres innervating vibrissae follicles. The specific cortical vibrissa area is somatotopically organized; 39% of the cortical units in that area responded to stimulation of only a single sinus hair but in some cases all maxillary vibrissae activated a single cortical neurone. The responses consisted of three major groups; either a phasic discharge in response to the movement part of a stimulus, or an additional tonic discharge related to the steady period of vibrissa deflection, or a tonic discharge. On the basis of a comparison of response and excitability characteristics of primary afferent and cortical neurones it is concluded that all four kinds of peripheral units innervating sinus hair follicles project to the somatosensory cortical area S I. It appears from these findings that some cortical neurones receive a specific input related to a particular component of the complex primary afferent response in fibres innervating sinus hair follicles. The results are discussed with respect to previous reports on the central representation of facial sinus hairs in different species.

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Authors and Affiliations

  1. Department of Neurobiology, Max-Planck-Institut for Biophysical Chemistry, Göttingen, FRG

    W. Schultz, G. C. Galbraith, K.-M. Gottschaldt & O. D. Creutzfeldt

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  1. W. Schultz
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  2. G. C. Galbraith
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  3. K.-M. Gottschaldt
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  4. O. D. Creutzfeldt
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Schultz, W., Galbraith, G.C., Gottschaldt, KM. et al. A comparison of primary afferent and cortical neurone activity coding sinus hair movements in the cat. Exp Brain Res 24, 365–381 (1976). https://doi.org/10.1007/BF00235004

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  • DOI: https://doi.org/10.1007/BF00235004

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