Voltage Noise in Limulus Visual Cells

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Science  05 Apr 1968:
Vol. 160, Issue 3823, pp. 88-90
DOI: 10.1126/science.160.3823.88


Intracellular recordings from Limulus eccentric cells suggest that the generator potential arises from the superposition of numerous discrete fluctuations in membrane conductance. If this is so, a relation between frequency response to flickering light and noise characteristics under steady light may be predicted. This prediction is verified experimentally. If a discrete fluctuation model is assumed, the data indicate that increased light has two major effects: (i) the discrete events are strongly light-adapted to smaller size, and (ii) the time course of each event becomes briefer.

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