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The generator potential appeared as a short-latency downward deflection of the voltage trace, and the amplitude of the evoked response increased with increasing flash intensity.
Previously we have shown that extracellular, light-induced generator potentials in the epistellar bodies of Eledone cirrhosa can be produced by light flashes of different intensity and duration, transmitted through the mantle sac wall of the octopus (Cobb et al.
Resting potential was recorded during cell impalement and generator potentials were recorded in response to light flashes, before switching to current injection in these experiments.
As already seen for the extracellular compound generator potentials, the time-to-peak depolarization for individual photoreceptor cells decreased with increasing stimulus intensity [ILLUSTRATION FOR FIGURE 10C OMITTED].
While perfusing the slice with modified Limulus Ringer (first trace), the light flash evoked a burst of [approximately]7 action potentials at the leading edge of the generator potential, followed by 34 action potentials yielding a steady-state firing rate of [approximately]4.
0 to 0 impulses/s, was associated with a partial hyperpolarization of the generator potential from 10 to 5 mV depolarization.
He covers cellular processes, cell membranes, channels and control of membrane potential, sensory generator potentials
, action potentials, synapses and muscles, and includes a practice examination with answers.