title: Electrophysiological evidences of mutual modulatory influences on the retinal activity of the crayfish Procambarus bouvieri (O).
abstract: Electroretinographic evoked potentials (ERGs) were recorded in dark adapted crayfish by the application of pulses of light (0.09 Cd/ft2) presented every 2.5 min. Heterolateral illumination (HI) for sixty min (0.06-0.3 Cd/ft2) induced up to 50% decrease in ERG after a latency of 12-25 min. ERG depression was proportional to the intensity of HI and also showed a circadian rhythm. During the alpha phase the ERG recovery started 3-10 min after HI was turned off. In contrast it started only after 10-20 min during the rho phase. The time course of the ERG depression, which was abolished in splitbrain animals, strongly suggests that a mutual modulatory influence, probably of neuroendocrine nature, is present in the crayfish visual system.
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000502:physiology*; D002940:Circadian Rhythm; D003623:Dark Adaptation; D004292:Dominance, Cerebral / Q000502:physiology*; D004596:Electroretinography; D005260:Female; D008297:Male; D009490:Neurosecretory Systems / Q000502:physiology; D010775:Photic Stimulation; D012160:Retina / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology