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SIGNAL PROBABILITY AND VIGILANCE: A REAPPRAISAL OF THE ‘SIGNAL‐RATE’ EFFECT
Author(s) -
BADDELEY A. D.,
COLQUHOUN W. P.
Publication year - 1969
Publication title -
british journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.536
H-Index - 92
eISSN - 2044-8295
pISSN - 0007-1269
DOI - 10.1111/j.2044-8295.1969.tb01189.x
Subject(s) - vigilance (psychology) , psychology , detection theory , signal (programming language) , statistics , visual attention , audiology , cognitive psychology , mathematics , cognition , computer science , neuroscience , telecommunications , medicine , detector , programming language
Performance on a 40 min. visual task was studied as a function of signal probability. A separate group was tested at each of five levels of signal probability (0·02, 0·06, 0·18, 0·24 and 0·36). Percent detections increased with signal probability. This increase was accompanied by a rise in the false report rate, and analysis in terms of signal detection theory suggested that signal probability affects the subject's criterion (β) rather than his ability to discriminate ( d ′).