85, p > .05, but "slow" old 5s showed less aftereffect, t (30) =2.69, p < .02. When slow old 5s were required to complete each judgment within 13 sec., aftereffect (M = +4.03, 5X> = 1.71) no longer differed from the value for young 5s, t (30) -.36, p > .05.These results support the claim (Singer & Day, 1965) that the time taken to complete postinspection judgments must be considered when amount of aftereffect is compared across different groups of 5s. Attention to this variable may show that it is unnecessary to appeal to hypothetical neural processes to explain differences found in amount of after-effect between brain-damaged and normal 5s (Klein & Krech, 1952) and between introverted and extraverted 5s (Eysenck, 1955). REFERENCES EYSENCK, H. J.Cortical inhibition, figural aftereffects and theory of personality.
parallel experiments are reported bearing on the shape-slant invariance hypothesis. Apparent-objective slant scales were 1st determined for 4 rectangles, 2 trapezoids, a random shape, and an ellipse. Apparent slant was found to be less than objective slant at 10°, 20°, and 30°, and to be greater at 60° and 80°; accuracy was achieved at close to 40°. Shape judgments w«re then measured for the same forms set at the same angles. The obtained increases in the quantity a -p as a function of slant agreed with predictions from the slant scales. Not predicted was the finding of overconstancy at 10° and 20°.
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