The role of object orientation in infant perception |
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| Authors: | H McGurk |
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| Affiliation: | 1. MRI Group, Singapore Bioimaging Consortium, A*STAR, Singapore;2. Psychology, National Cheng-Kung University, Tainan, Taiwan;3. Psychology, Neurobiology and Physiology, Northwestern University, Evanston, IL, USA;4. Physiology, Feinberg School of Medicine Northwestern University, Chicago, IL, USA;5. Clinical Imaging Research Centre, National University of Singapore, Singapore;6. Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore;1. Public Health & Integrated Toxicology Division, Center for Public Health and Environmental Assessment, United States of America;2. Retired, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States of America;1. Human Psychobiology Lab, Experimental Psychology Department, University of Sevilla, Sevilla, Spain;2. Developmental and Educational Psychology Department, University of Sevilla, Sevilla, Spain |
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| Abstract: | Eighteen subjects between 6 and 26 weeks participated in a series of experiments designed to assess the extent to which orientation is a factor in infant perception of facial and abstract objects. One experiment, based on the spontaneous visual preference procedure, in which subjects were simply exposed to pairs of objects in different orientations, failed to show discrimination between orientations. In two other experiments subjects were firstly habituated to the appearance of objects in a constant orientation before being presented with the same objects in another orientation. Analysis of the magnitude of recovery of attending responses on presentation of objects in the new orientation revealed (a) that infants between 6 and 26 weeks perceive the change that occurs when the orientation of an object is altered by 180 deg., and (b) that they perceive the difference between an otherwise identical pair of relatively simple abstract shapes when their orientations differ by 180 deg.; with facial objects it was only subjects in the 20 to 26 weeks age range who appeared to make this latter discrimination. Results are interpreted as suggesting that young infants are more sensitive to the spatial orientation of forms that has hitherto been believed to be the case. |
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