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| Titel: |
Electrophysiological and behavioral measures of seasonal and monthly variations in Limulus ventral eye sensitivity |
| Auteur: |
Ross-Farhang, Sandra Gadient, John L. Wasserman, Gerald S. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 21 (1990) nr. 2 pagina's 97-118 |
| Jaar: |
1990-06 |
| Inhoud: |
Visual sensitivity of the horseshoe crab, Limulus polyphemus, was followed over the course of a year using both physiological and behavioral criteria. An electroretinographic (ERG) index was derived from ventral eye intensity-latency functions. A behavioral signal detectability (BSD) index was derived from the relative frequency of reflex tail flicks occurring when the ventral eye was in the dark or in the light. A seasonal variation in Limulus visual sensitivity was found both physiologically and behaviorally. Sensitivity was highest in the summer and lowest in the winter. The ERG measures exhibited a 1.2 log unit seasonal variation in sensitivity. The BSD measures gave a .72 detectability unit (d') variation. The ERG variation correlated strongly with the BSD variation (r = .76). These data suggest that the site of the mechanism that causes the seasonal variation is in or distal to the ventral photoreceptors. But multimodal distributions of the BSD detectability measures were also found without any correspondence in the ERG distributions. This implicates an additional more central source influencing visual sensitivity. Evidence of a smaller .53 log unit monthly variation was also found in the physiology but not in the behavior. Sensitivity was highest at new moon and lowest at full moon. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 9 gevonden artikelen
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