Field potentials evoked in the avian optic tectum by diffuse and punctiform luminous stimuli |
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Authors: | A. L. Holden |
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Affiliation: | (1) Department of Visual Science, Institute of Ophthalmology, Judd St., WC1 H 9QS London, England |
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Abstract: | Summary An investigation was made of the slow field potentials evoked in the pigeon optic tectum by visual stimulation. Diffuse illumination of the retina produces a polyphasic response which is negative-going in the surface layers and reverses polarity at 200–400 m. It is suggested that this response reflects activity in radially disposed nerve cells. Local stimulation, produced by punctiform (small-spot) stimuli, results in a negative-going response in the superficial tectum, paired with a smaller and less widely distributed positive-going wave in the deeper layers. It is suggested that this response involves both radial neurones and the tangential neurones ramifying in layers c and d of the SGFS. |
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Keywords: | Avian tectum Evoked field potentials |
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