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This report describes an instrument which will automatically predict the occurrence of the P-R interval on a beat-to-beat basis. Tests have demonstrated an almost perfect accuracy in older subjects whose beat-to-beat variations are small. The average accuracy with a group of 23 men, 19 of whom were 20-30 years old, was 95% correct prediction. In young women with very large beat-to-beat variations, the average accuracy achieved was 75% correct prediction. [ABSTRACT FROM AUTHOR]

This paper presents the basics of digital logic operations, discusses the functional operation of electronic circuits which accomplish these operations and analyzes the operation of complexes of these circuits which may be used for counting, timing, and amplitude registration of the phenomena of interest in psycho-physiological research. [ABSTRACT FROM AUTHOR]

A peak sampling circuit useful for displaying such variables as blood pressure, is described. The advantage of simplicity and low cost balances against the disadvantage of holding the signal only for three quarters of a cycle. [ABSTRACT FROM AUTHOR]

The circuit described represents a relatively simple and economical solution to the problem of presenting to the human S his heart rate data in the form of an auditory signal. The requirements of portability, low cost, and long-term unattended operation have been met. In addition, portions of the circuit have additional uses in the general area of psychophysiological instrumentation. [ABSTRACT FROM AUTHOR]