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A comparison of continuous performance tasks (CPTs) using cognitive versus sensory stimuli was undertaken to compare vigilance performance on analogous verbal and non-verbal tasks in normal , young adults . Eighty-nine introductory psychology students , screened for head injury, neurological deficits, and medication and substance use performed two versions of an auditory , computerized CPT. In the verbal task , stimuli were letters of the alphabet, whereas in the non-verbal task , they were tones of the major diatonic scale . During each 15 min task , 1200 stimuli were presented at an onset -to-onset time of0 .75 sec. A total of 100 targets was presented in semi-random sequence at an average rate of one every 9 sec. Targets were constituted by stimuli that were identical to the immediately preceding stimulus . Participants were required to respond to targets with the press of a hand-held button . Results indicated significant differences between the two versions of the task on accuracy, adjusted accuracy , and false alarm rate. In addition, correlations were found both within and between the tasks for accuracy, adjusted accuracy , and reaction time . Implications of these results for models of attention , theories of laterality and attentional mechanisms, and clinical use are discussed .

A Comparison of Continuous Performance Tasks Using Cognitive Versus Sensory Stimuli