Accession Number : AD0693868

Title :   A STOCHASTIC MODEL OF SIGNAL DETECTION UNDER CONDITIONS OF TEMPORAL UNCERTAINTY.

Descriptive Note : Progress rept.,

Corporate Author : ARMY MEDICAL RESEARCH LAB FORT KNOX KY

Personal Author(s) : Cronholm,James N.

Report Date : 24 JUN 1968

Pagination or Media Count : 41

Abstract : The report describes a reformulation of the problem of analyzing detection data obtained when signal presentation times follow an arbitrary intersignal interval distribution. The approach is based on revised definitions of hits, misses, correct negatives, and false positives which are natural in this situation. It permits the construction of functions analogous to the isosensitivity and isobias curves of classical detection theory directly from observed time series of signals and responses. A model of the processes underlying the generation of signal-response time series is described, and the probability densities of interval durations associated with hits, misses, correct negatives, and false positives are presented. The areas under these distributions, and two related densities, are interrelated. An expression for the expected number of responses per signal is given along with suitable estimation procedures. The proposed model incorporates arbitrary intersignal interval and response latency distributions. These were replaced respectively by exponential and triangular distributions in a test of the model using data obtained from a simple auditory detection experiment in which signal rate and intensity were varied. (Author)

Descriptors :   (*INFORMATION THEORY, MATHEMATICAL MODELS), (*SIGNALS, DETECTION), STOCHASTIC PROCESSES, TIME SERIES ANALYSIS, UNCERTAINTY

Subject Categories : Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE