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  • Title: Field potentials evoked in the avian optic tectum by diffuse and punctiform luminous stimuli.
    Author: Holden AL.
    Journal: Exp Brain Res; 1980; 39(4):427-32. PubMed ID: 7398835.
    Abstract:
    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 micron. 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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