Abstract
Errors in discriminating the letters O and D in a forced-choice design were measured with 4 Ss when the exposure of either letter was accompanied or followed by a ring encircling it. The delay between offset of the letter and onset of the ring varied from concurrent presentation of both, through 0 msec. delay to 120 msec. delay, in steps of 10 msec. The letter and ring were presented randomly in one of four positions in a centrally located row, with the other three positions always empty. Accuracy was a u-shaped function of the delay between letter and ring for all 4 Ss. An explanation of the discrepancy between these findings and those of Eriksen & Collins (1964) is offered.
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