A Correlator of Time Intervals Between Pulses

In neurophysiological studies, it is frequently advantageous to ascertain various time relationships between neuronal discharges, or spikes. During the course of the Applied Physics Laboratory's endeavors in the field of neuronal studies, a particular need arose for a means of determining some of these time relationships. To meet this need, a relatively inexpensive electronic device was designed and built at the laboratory. This paper is a description of the device's capabilities, limitations, some of its more common functional uses, and circuitry. The application, while referenced to neuronal discharges, may be with respect to a number of pulse waveforms.