Counting eliminates the repetition effect in judgments of temporal duration.

College student subjects estimated the duration of time intervals (8–54 sec) by counting or not (N=35 per group). Counting eliminated the repetition effect (a decline in the magnitude of estimations across trials), and resulted in a truncation of the psychophysical function. The former result was interpreted as contrary to Treisman's (1963) model. The latter result was attributed to the effortfulness of counting, which was established in a subsequent experiment.     

The repetition effect in time judgments is not a function of the intensity of the stimulus defining the interval: implications for an arousal theory

College students (N = 17 per group) estimated the durations of time intervals ranging from 8 to 20 sec. Intervals were defined by tones of 35, 55, and 75 db for each of three groups. The estimates of all groups declined across trials, but the degree of decline did not differ as a function of stimulus intensity. These data call into question the view that the repetition effect is attributable to a decrement in general arousal.     

Lexical discrimination and letter-string identification in the two visual fields.

Right-handed subjects were tachistoscopically presented three-letter words and nonword permutations in a single visual field for 20 msec. Although the subjects were unable to identify the stimuli at this exposure duration, their lexical decisions were better than chance, and were superior in the left visual field. When the exposure duration was increased, subjects demonstrated superior identification of the words in the right visual field. Results are discussed within an information processing framework.