Activation of a regenerative calcium conductance in turtle cones by peripheral stimulation
- 16 May 1978
- journal article
- research article
- Published by The Royal Society in Proceedings of the Royal Society of London. B. Biological Sciences
- Vol. 201 (1144), 309-315
- https://doi.org/10.1098/rspb.1978.0048
Abstract
Light stimulation of the periphery of the receptive field of some turtle [Pseudemys scripta elegans] cones evoked spikes which are tetrodotoxin-insensitive. In all cones, Sr2+ or Ba2+ (4-12 mM) induced the appearance of spikes in response to peripheral illumination. These spikes were blocked by Co2+ and by agents which depolarized the L-horizontal cells and blocked their responses. Apparently peripheral illumination evokes Ca2+ spikes in turtle cones through a feedback synaptic mechanism from the L-horizontal cells.Keywords
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