This study examined the hypothesis that perceptual errors on a task requiring subjects to take different viewpoints could be explained in terms of response bias. Results were consistent with response bias hypothesis: making an egocentric error is different from behaving in an egocentric manner. (Author/SB)

A developmental reversal in accuracy was obtained for third and sixth graders and adults who judged class membership of patterns presented in a same-different task. Reversal accuracy appeared to result from an increase with age in orientation-free judgments. This hypothesis was confirmed in the subsequent two experiments. (GO)