A Triggering voltage too positive. B Correct triggering voltage. C Triggering voltage too negative. Note trigger artefact at 1 msec. which may be mistaken for the stimulus artefact. 1 Free-running time scale. Sweep triggered by stimulator. 2 Time scale and sweep both triggered by stimulator. 3 Time scale and sweep triggered by pre-pulse 3 msec. before stimulus.
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J. A. Simpson (1964) studied this question.
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