An Electronic Integrating Circuit for Recording the Spontaneous Activity of Animals

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Abstract
Various mechanical and electrical techniques have been used to record the spontaneous activity of animals during pharmacological and physiological studies. Most of them are in‐adequate in one way or another. An electronic integrating circuit is described which eliminates the principal faults inherent in other methods. An electromagnetic pick‐up is mounted on a small rigid cage which is supported on a viscous damping mount. The output of this pick‐up is amplified, rectified, and stored in a condenser. The voltage acquired by the condenser is applied as the plate voltage of a small thyratron. The bias on the thyratron controls the energy required to fire the circuit. When the circuit fires, a sensitive relay is closed and the unit represented is written on a moving tape and added to a counter. The results obtained by this method are in discrete units and can be treated by mathematical methods.

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