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Titolo:
HORIZONTAL CELL SENSITIVITY IN THE CAT RETINA DURING PROLONGED DARK-ADAPTATION
Autore:
LANKHEET MJM; ROWE MH; VANWEZEL RJA; VANDEGRIND WA;
Indirizzi:
UNIV UTRECHT,NEUROETHOL HELMHOLTZ INST & COMPARAT PHYSIOL,PADUALAAN 8NL-3584 CH UTRECHT NETHERLANDS
Titolo Testata:
Visual neuroscience
fascicolo: 5, volume: 13, anno: 1996,
pagine: 885 - 896
SICI:
0952-5238(1996)13:5<885:HCSITC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDUCED FLICKER ENHANCEMENT; GANGLION-CELLS; SPATIAL PROPERTIES; PLEXIFORM LAYER; ROD; RESPONSES; LIGHT; MICROCIRCUITRY; ORGANIZATION; PATHWAYS;
Keywords:
HORIZONTAL CELL; DARK ADAPTATION; CAT RETINA; ROD AND CONE INPUT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
M.J.M. Lankheet et al., "HORIZONTAL CELL SENSITIVITY IN THE CAT RETINA DURING PROLONGED DARK-ADAPTATION", Visual neuroscience, 13(5), 1996, pp. 885-896

Abstract

The effects of dark adaptation on the response properties of ganglioncells have been documented extensively in the cat retina. To pinpointthe different retinal mechanisms that underlie these effects, we studied the response characteristics of cat horizontal (H) cells during prolonged dark adaptation. H-cell responses were recorded intracellularly in the optically intact, in vivo eye. To disentangle rod and cone contributions, sensitivity changes during dark adaptation were tracked with white light and with monochromatic lights that favored either rod or cone excitation. Stable, long-lasting recordings allowed us to measure changes of sensitivity for adaptation periods up to 45 min. Thresholds for white light and 503-nm monochromatic light decreased steadilyand in parallel. The maximum increase of sensitivity, after extinguishing a photopic adaptation light, was 1.8 log units only, reached after about 35 min. Sensitivity for 581-nm lights also increased steadily,but at a shallower slope. The steady increase of sensitivity was concomitant with a linear shift in resting membrane potential and with an increase in relative rod contribution to the threshold responses. Eventhough small-amplitude responses were rod dominated after prolonged dark adaptation, sensitivity to rod signals remained relatively low, compared to sensitivity of cone responses or to the absolute sensitivityof ganglion cells. This suggests that the cone-H-cell pathway plays no role in the dark-adapted cat retina.

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Documento generato il 03/12/20 alle ore 04:53:12