Stroop Interference with Long Preexposures of the Word: Comparison of Pure and Mixed Preexposure Sequences.
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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Stroop interference, the increase in time to name colors when the patches are incongruent color names, was studied as a function of the duration of a preexposure of the work in black prior to coloration. Individual word and control stimuli were presented in a tachistoscope and naming latencies were recorded with a voice key. Interference decreased to very low levels at 2 sec of preexposure, supporting the findings of a previous study using very short preexposures. Interference then increased to intermediate levels for longer preexposures. Facilitation of color-naming by congruent color names generally paralleled interference effects. Sequences of stimuli in which the preexposure interval varied randomly from trial-to-trial showed longer color-naming times for short preexposures than did sequences where all stimuli in the sequence used the same preexposure. The utility of this procedure for study of the central activity produced by viewing a written word was discussed. Author