Rod photoreceptors and scotopic vision in ground squirrels
作者:
Gerald H. Jacobs,
R. B. H. Tootell,
Steven K. Fisher,
Don H. Anderson,
期刊:
Journal of Comparative Neurology
(WILEY Available online 1980)
卷期:
Volume 189,
issue 1
页码: 113-125
ISSN:0092-7317
年代: 1980
DOI:10.1002/cne.901890107
出版商: Wiley Subscription Services, Inc., A Wiley Company
数据来源: WILEY
摘要:
AbstractGround squirrel retinas contain a relatively small complement of rods (5–10% of all photoreceptors) which are thought to provide the basis for a weak scotopic visual capacity. In a previous investigation of the California ground squirrel (Spermophilus beecheyi) involving the recording of a retinal gross potential, the electroretinogram (ERG), electrophysiological evidence for a viable scotopic signal could be obtained from some, but not all of the ground squirrels examined. To further pursue the possibility that there is a structural/functional discrepancy in the relationship between rod photoreceptors and scotopic vision in the ground squirrel, several experiments involving electrophysiological, behavioral, and anatomical observations have been conducted. We found that although about one‐third of the ERGs recorded from a large sample of California ground squirrels lack those characteristics which would indicate the presence of a viable scotopic signal, the retinas of all the squirrels appear to contain the same small population of rod photoreceptors. Additional experiments on the golden‐mantled ground squirrel (Spermophilus lateralis), including behavioral as well as ERG measurements and anatomical observations, lead to this same concl
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