Chronometer unit for physiological experiments - applies stimulus to laboratory animal in response to clock pulse and records detected response

摘要

The chronometer unit is used in physiological experiments for studying the responses of laboratory animals to an applied stimulus. A stimulus is applied to the animal in response to a clock pulse and a probe with two electrodes, attached to the cortex of the animal at two spaced points, for measuring the evoked potential. The probe is connected to a differential amplifier the output voltage of which is supplied to a chronometer recorder, released by the clock pulse. The recorder includes a bistable comparator, which changes state in response to passage of the amplifier voltage through an adjustable initial level. An interface provides a reference pulse in response to each change of state, with the outputs of a switching circuit energised in sequence in response to the reference pulses, used to control a counter.