Tonic effects of stationary luminous slits on the discharge rates of some locust visual interneurones |
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Authors: | W.T. Catton |
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Affiliation: | Zoology Department, The University, Newcastle upon Tyne, NE1 7RU, U.K. |
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Abstract: | The presence of an illuminated slit in the visual field of a locust compound eye produced changes in the tonic discharge rate of the DCMD and three other visual interneurones, recorded in a connective. The DCMD discharge peaked initially in the range of low slit subtenses, but over a period of minutes of exposure its character changed so that there was a rise at high subtenses also. When the luminance of a slit of fixed subtense was increased in steps, there was an initial rise then a sharp fall in discharge, indicating an abrupt onset of inhibition. Lateral spread of inhibition could account for the peak in response to slits, at a subtense falling well within the acceptance angle of a single ommatidium. The results show the ability of some visual interneurones to maintain a changed level of discharge in the presence of a stationary object in the visual field of the eye. |
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Keywords: | Locust visual interneurone discharge slit |
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