This interface records a knee jerk reflex.  The upper trace is a recording of leg movements (from a force transducer).  The lower trace is the recording of a hammer strike (the impact of the hammer completes a circuit, sending a five volt signal to the computer).  One can use the markers to measure the time delay between onset of the stimulus and the response.  The markers can be moved by dragging, or by setting their position with the control dials.

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Last revised by Andrew Smith November 20, 2000.