When perception intrudes on 2D grasping: evidence from Garner interference
| Autor: | Melvyn A. Goodale, Aviad Ozana, Tzvi Ganel |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Dissociation (neuropsychology)
Visual perception media_common.quotation_subject Experimental and Cognitive Psychology 050105 experimental psychology Visual processing 03 medical and health sciences 0302 clinical medicine Arts and Humanities (miscellaneous) Perception Developmental and Educational Psychology Contrast (vision) Humans Psychology 0501 psychology and cognitive sciences media_common Hand Strength Psychological research 05 social sciences Neurosciences General Medicine Object (philosophy) Action (philosophy) Visual Perception 030217 neurology & neurosurgery Psychomotor Performance Cognitive psychology |
| Zdroj: | Brain and Mind Institute Researchers' Publications |
| Popis: | © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. When participants reach out to pick up a real 3-D object, their grip aperture reflects the size of the object well before contact is made. At the same time, the classical psychophysical laws and principles of relative size and shape that govern visual perception do not appear to intrude into the control of such movements, which are instead tuned only to the relevant dimension for grasping. In contrast, accumulating evidence suggests that grasps directed at flat 2D objects are not immune to perceptual effects. Thus, in 2D but not 3D grasping, the aperture of the fingers has been shown to be affected by relative and contextual information about the size and shape of the target object. A notable example of this dissociation comes from studies of Garner interference, which signals holistic processing of shape. Previous research has shown that 3D grasping shows no evidence for Garner interference but 2D grasping does (Freud & Ganel, 2015). In a recent study published in this journal (Löhr-Limpens et al., 2019), participants were presented with 2D objects in a Garner paradigm. The pattern of results closely replicated the previously published results with 2D grasping. Unfortunately, the authors, who appear to be unaware the potential differences between 2D and 3D grasping, used their findings to draw an overgeneralized and unwarranted conclusion about the relation between 3D grasping and perception. In this short methodological commentary, we discuss current literature on aperture shaping during 2D grasping and suggest that researchers should play close attention to the nature of the target stimuli they use before drawing conclusions about visual processing for perception and action. |
| Databáze: | OpenAIRE |
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