EXPERIMENTAL STUDIES OF HUMAN VIGILANCE
ILLINOIS UNIV AT URBANA AVIATION PSYCHOLOGY LAB
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A series of experiments was conducted on human vigilance or the characteristics of long-term human attentiveness for the occasional occurrences of signals which are to be detected and reported. Emphasis was given complex visual displays with multiple stimulus sources and alpha-numeric signals of the general class found in semi-automatic man-machine systems. The results were that 1 vigilance decrement usually occurs in small but reliable amounts within a session but does not increase as a function of number of daily sessions, 2 only response produced stimuli from simple decision behavior were a source of stimulation that deterred vigilance decrement in accord with the arousal hypothesis, 3 temporal uncertainty was not associated with differential vigilance decrement although spatial uncertainty appeared to be under some circumstances, and 4 feedback about the operators proficiency after each response was a training method that improved monitoring behavior in a stable manner.