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A series of experiments was carried out to examine the effect of curvature on haptic
judgments of extent in sighted and blind individuals. Experiment 1 showed that diameters connecting the endpoints of semicircular lines were underestimated with respect to straight lines,
but failed to show an effect of visual experience on length judgments. In experiment 2 we tested
arc lengths. The effects of curvature on perceived path length were weaker, but were still present
in this experiment.Visual experience had no effect on path length judgments. Another experiment
was performed to examine the effect of repeated tracing (1, 5, 9, or unlimited number of traces)
on judgments of the lengths of straight lines and diameters of semicircles. Judgments of extent
were more accurate when subjects engaged in larger numbers of traces. There was no effect of
number of traces on curve-height judgments, suggesting that subjects were not using height
estimates to judge diameters of semicircles. In a further experiment we tested the effect of
number of traces on curves that varied in height. Restricting subjects to a single trace magnified
the effect of path length on judgments of the distance between the endpoints of curves. Additional
experiments showed that curvature effects on diameter judgments were not eliminated when stimuli
were in the frontal plane or when the curves were explored with the use of two hands. Arm support
had no effect on judged length in experiment 7. A final experiment showed a robust horizontal-vertical illusion in haptic perception of convex curves, with overestimation of the heights of the
curves compared with their widths. The practical and theoretical implications of the results are
discussed
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