“…I n addition, several studies have demonstrated the sensiDownloaded by [University of Sussex Library] at 11:43 06 February 2015 tivity of tracking measures to indicate tracking, for example, might simply be "distraction" effects (e.g., Malmo, 1966 ; measured by a decrement in tracking Sterky and Eysenck, 1965; and Walker, performance (cf. Walker, et al, 1964, andet aZ., 1964). It is unfortunate, however, Sterky and Eysenck, 1965).…”