Light input to crustacean neurosecretory cells.

Electrical activity was recorded intracellularly from neurosecretory cells in the crayfish eyestalk identified by lucifer yellow injection. The activity is most commonly enhanced by illumination of retinal fields. Increments in spontaneous activity as well as bursts in otherwise silent cells were the most common type of response. Occasionally light-induced inhibitory responses were recorded. At neuropil level, light pulses result in EPSPs with amplitudes dependent on intensity of light and the previous adaptation to darkness.