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Antwort von retinalen Ganglienzellen bei freibeweglichen Kröten ( Bufo bufo L.)

Identifieur interne : 001A03 ( Main/Exploration ); précédent : 001A02; suivant : 001A04

Antwort von retinalen Ganglienzellen bei freibeweglichen Kröten ( Bufo bufo L.)

Auteurs : -P. Ewert [Allemagne] ; -W. Borchers [Allemagne]

Source :

RBID : ISTEX:3A5EF04CEA6407974E0B261326FD9FE10781B9D0

Abstract

Summary: The development of a miniature headpiece with which action potentials can be recorded from single neurones in the visual pathway of freely moving toads is described (Figs. 2, 3, and 4). At first two questions were posed: (1) Do the retinal „off” and „on-off” ganglion cells respond when the toad casts a shadow on the retina while its eye is closed? (2) In view of the fact that toads do not perform any involuntary eye movements to help them receive information about the stationary environment, are there eye movements that are synchronized with respiration to act as a „substitute”? 1. During eye closure, the retinal „on-off” and „off” ganglion cell-classes III and IV respectively (Figs. 5A and B), are inhibited presumably by efferences from the CNS (Figs. 5C1, C2 and 6). Thus the brain of the toad receives through these ganglion cells information about changes in brightness exclusively of the surroundings. 2. When a toad sits quietly, the retinal class II, III and IV ganglion cells are not activated by a stationary visual stimulus. Under these circumstances the cells remain silent even during respiratory pressure changes in the buccal cavity. Thus the initial conclusion is that the toad receives no information about the patterned, stationary environment via the retino-tectal projection when it is sitting quietly in the present situation.


Url:
DOI: 10.1007/BF00694501


Affiliations:


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<div type="abstract" xml:lang="en">Summary: The development of a miniature headpiece with which action potentials can be recorded from single neurones in the visual pathway of freely moving toads is described (Figs. 2, 3, and 4). At first two questions were posed: (1) Do the retinal „off” and „on-off” ganglion cells respond when the toad casts a shadow on the retina while its eye is closed? (2) In view of the fact that toads do not perform any involuntary eye movements to help them receive information about the stationary environment, are there eye movements that are synchronized with respiration to act as a „substitute”? 1. During eye closure, the retinal „on-off” and „off” ganglion cell-classes III and IV respectively (Figs. 5A and B), are inhibited presumably by efferences from the CNS (Figs. 5C1, C2 and 6). Thus the brain of the toad receives through these ganglion cells information about changes in brightness exclusively of the surroundings. 2. When a toad sits quietly, the retinal class II, III and IV ganglion cells are not activated by a stationary visual stimulus. Under these circumstances the cells remain silent even during respiratory pressure changes in the buccal cavity. Thus the initial conclusion is that the toad receives no information about the patterned, stationary environment via the retino-tectal projection when it is sitting quietly in the present situation.</div>
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