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ON EXPECTANCY AND AVERAGE REACTION TIME
Author(s) -
THOMAS EWART A. C.
Publication year - 1970
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.2044-8295.1970.tb02799.x
Subject(s) - expectancy theory , psychology , life expectancy , statistics , developmental psychology , function (biology) , interpretation (philosophy) , duration (music) , cognitive psychology , social psychology , mathematics , demography , computer science , population , evolutionary biology , sociology , biology , art , literature , programming language
The notion of expectancy has often been used in explanations of the relationship between foreperiod variability and simple reaction time. Two interpretations of the notion are distinguished: one is that expectancy or expectancy level is a moment in time, and the other is that expectancy is a regular function of time. The latter interpretation is adopted and it is shown that if expectancy is defined as the conditional probability of signal occurrence, then average reaction time would be linearly related to mean foreperiod duration. It is argued that this result can serve as a basis for unifying apparently diverse explanations of the reaction time—foreperiod relationship. Experimental data are presented which are consistent with the view of expectancy proposed in this paper.