Abstract
1. 1. Miniature and stimulus-evoked electroplaque potentials were recorded in Torpedo eleetrocytes intracellularly and extracellularly and analysed quantitatively. 2. 2. Tetrodotoxin reversibly blocked stimulus evoked potentials but hardly affected spontaneous miniature potentials in amplitude and frequency. 3. 3. The quantum content of stimulus-evoked potentials varied between 150 and 400 in normal saline and decreased in low Ca 2+ high Mg 2+ solution. Quantal release conformed to binomial statistics and allowed determination of the release parameters p and n. 4. 4. Analysis of the time constant of decay of spontaneous miniature electroplaque currents showed variation around a mean of 0.75 ± 0.16 msec (SD) which was greatly prolonged by application of neostigmine.
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