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Translation Invariance in Object Recognition, and Its Relation to Other Visual Transformations

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Show simple item record Dill, Marcus en_US Edelman, Shimon en_US 2004-10-20T21:03:58Z 2004-10-20T21:03:58Z 1997-06-01 en_US
dc.identifier.other AIM-1610 en_US
dc.identifier.other CBCL-150 en_US
dc.description.abstract Human object recognition is generally considered to tolerate changes of the stimulus position in the visual field. A number of recent studies, however, have cast doubt on the completeness of translation invariance. In a new series of experiments we tried to investigate whether positional specificity of short-term memory is a general property of visual perception. We tested same/different discrimination of computer graphics models that were displayed at the same or at different locations of the visual field, and found complete translation invariance, regardless of the similarity of the animals and irrespective of direction and size of the displacement (Exp. 1 and 2). Decisions were strongly biased towards same decisions if stimuli appeared at a constant location, while after translation subjects displayed a tendency towards different decisions. Even if the spatial order of animal limbs was randomized ("scrambled animals"), no deteriorating effect of shifts in the field of view could be detected (Exp. 3). However, if the influence of single features was reduced (Exp. 4 and 5) small but significant effects of translation could be obtained. Under conditions that do not reveal an influence of translation, rotation in depth strongly interferes with recognition (Exp. 6). Changes of stimulus size did not reduce performance (Exp. 7). Tolerance to these object transformations seems to rely on different brain mechanisms, with translation and scale invariance being achieved in principle, while rotation invariance is not. en_US
dc.format.extent 1974851 bytes
dc.format.extent 466161 bytes
dc.format.mimetype application/postscript
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dc.language.iso en_US
dc.relation.ispartofseries AIM-1610 en_US
dc.relation.ispartofseries CBCL-150 en_US
dc.title Translation Invariance in Object Recognition, and Its Relation to Other Visual Transformations en_US

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