The after-effect of the perception of curved lines.

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Abstract
Subjects first inspected a curved stimulus line and then a straight test line and were asked whether the test line appeared straight or curved. If it appeared curved the test line was bent until the subject declared that it appeared straight. The extent to which the test line was bent gave a measurement of the amount of apparent curvature. In test series I 11 subjects inspected a stimulus line (convex to left) 30 cm. long with a displacement of 40 mm. at the center for 10 minutes. The average displacement was 1.73 mm. A repetition of the test with the inspection time reduced to 5 minutes gave an apparent displacement of 1.5 mm. In test series II 12 subjects were tested, using a curved line with an 80-mm. displacement at the center. The stimulus was exposed for 5 minutes. In this case the greater curvature of the stimulus line did not increase the after-effect, but on the contrary diminished it slightly. Test series III was concerned with the change in amount of after-effect resulting from the interposition of intervals of varying character between the inspection period and the test period. A new group of subjects was used. The average after-effect immediately after a 5-minute inspection period was 2.5 mm.; with a 30-second fixation interval between inspection period and test the effect dropped to 1.58 mm.; with a 60-second interval it dropped to .83 mm. Following 30- and 60-second reading intervals after-effects of 1.78 and 1.55 mm. occurred. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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