Evan Cesanek

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Not a great deal is known about the electrophysiology of category learning. In our study, one group of participants learned novel categories of tropical fish, an exposure group viewed the same stimuli without learning any categories, and a control group did not see the stimuli. All three groups then viewed a sequence of quadruples of fish while their EEG(More)
Recent results have shown that effects of pictorial illusions in grasping may decrease over the course of an experiment. This can be explained as an effect of sensorimotor learning if we consider a pictorial size illusion as simply a perturbation of visually perceived size. However, some studies have reported very constant illusion effects over trials. In(More)
Grasping is a flexible human motor behavior coordinated on the basis of perceptual information about the structure of surfaces in reachable space. In two original experiments, we investigated the perceptual information supporting accurate grasp performance. Participants in these experiments reached-to-grasp target objects that were situated in illusory(More)
The visual processes that support grasp planning are often studied by analyzing averaged kinematics of repeated movements, as in the literature on grasping and visual illusions. However, by recalibrating visuomotor mappings, the sensorimotor system can adjust motor outputs without changing visual processing, which complicates the interpretation of averaged(More)
Haptic feedback consists of the tactile and kinesthetic information available during physical interaction with surfaces and objects. When grasping an object, haptic information specifies object size and therefore may influence grasp kinematics over multiple grasps. In real-world grasping movements, the visual size of an object exactly corresponds to its(More)
Do illusory distortions of perceived object size influence how wide the hand is opened during a grasping movement? Many studies on this question have reported illusion-resistant grasping, but this finding has been contradicted by other studies showing that grasping movements and perceptual judgments are equally susceptible. One largely unexplored(More)
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