Abstract
While activation has proved to be a very useful concept in understanding behavior, theoretical and practical problems concerning physiological measurement have reduced its utility. Controlled self-report is suggested as an alternative measurement form, and data from several studies are presented indicating the validity of the Activation-Deactivation Adjective Check List (AD-ACL), an objective self-report measure of transient levels of activation. Factor analytic studies yielded four AD-ACL factors representing different points on a hypothetical continuum. These factors correlated substantially with physiological variables and reflected significant activation changes as predicted from diurnal sleep-wakefulness variations and from an impending college examination. The relative merits of self-report and individual peripheral physiological measures in the assessment of activation are discussed.
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