Abstract
Kinesthetic (figural) aftereffect (KAE) studies almost always involve an aftereffect-inducing stimulus (I) that is wider or narrower than the test stimulus (T). I ≠ T has been presumed to be a necessary condition for KAE’s occurrence. We contend that this, in part, reflects researchers’ failure to use an appropriate control condition (here, I = T): Effects due to size difference and effects due to induction per se have been confounded. In a new study, which explored the relationships of I > T and I < T relative to an I = T control condition, I < T did, but I > T surprisingly did not, differ from I = T. Two different KAE phenomena apparently exist: an aftereffect induction phenomenon and a contrast effect. There is also an effect for the I = T condition of decrease in width judgments.
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