Accession Number:

AD0254835

Title:

SIGNAL DETECTION AS A FUNCTION OF INTERSIGNAL INTERVAL DURATION

Descriptive Note:

Corporate Author:

HUMAN FACTORS RESEARCH INC LOS ANGELES CA

Report Date:

1961-02-01

Pagination or Media Count:

26.0

Abstract:

The probability of signal detection as a function of intersignal interval duration was determined from data obtained in 3 studies of vigilance performance. In one study, the distribution of intersignal intervals was positively skewed, there were many more brief intervals than long intervals. In other studies, the distributions of intervals were rectangular. The intersignal intervals were identified by 1 the amount of time since the previous signal was detected, 2 the amount of time since the previous signal occurred, and 3 the amount of time since the previous signal was missed. The results support an expectancy theory of vigilance, if theory is modified to state that expectancy and hence probability of detection is highest at the modal rather than the mean intersignal interval.

Subject Categories:

  • Psychology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE