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Coding of spatial coordinates on neurones of the feline visual association cortex

Benedek, György; Sztriha, László; Kovács, Gyula

Vision, Central

The receptive field properties of 131 visual neurons lying along the anterior ectosylvian sulcus were studied with extracellular recordings in barbiturate‐anaesthetized, immobilised, artificially ventilated cats. A stationary visual noise pattern was presented in an area of 24 × 32°, in which an 8 × 8° portion moved randomly at a speed of 10 deg/s. A definite best area characterized by maximal firing rate was found, from where the firing rate declined monotonously towards the periphery of the receptive field. The best area locations were distributed in a 40 × 40° region around the area centralis. These results seem to verify a rather robust capacity in AEV neurones for stimulus localization, in spite of their immense receptive fields.

1 Department of Physiology, Albert Szent‐Györgyi Medical University, H‐6720 Szeged, Dómtér 10, POB 427, Hungary

2 Corresponding Author: György Benedek

Acknowledgements: The work was supported by OTKA grant T‐029817 (Hungary) and by ETT grant 611/96. The critical reading by Professor Jonathan Victor is gratefully acknowledged.

Received 11 January 2000; accepted 17 February 2000

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