Abstract
The effect of training Ss to perceive figures in reversible but biased black-white targets upon subsequent figure-ground organization of ambiguous test targets was investigated at 3 levels of training (8, 16, and 24 tachistoscopic exposures). Bias was achieved by superimposition of the target half intended to be seen as figure. Ninety Ss composing 2 experimental groups and a control group of 10 Ss each at the 3 levels of training were used. The experimental groups were trained on opposite halves of the targets; each control group was trained on control targets. The results showed no significant effect at the 8-exposure level, no significant effect of training on the black halves at any level, but a significant effect (p <.01) of training on the white halves at both the 16-and 24-exposure levels.

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