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Some results on translation invariance in the human visual system

In 4 experiments, 35 Ss were trained to discriminate between a previously unknown target and 2 nontarget distractors presented at a fixed retinal location to one side of the fixation point. This performance was compared with that of a test phase in which the patterns were presented either centrally at the fixation point or at a location on the other side of the fixation point, opposite to the location where the patterns were learned but where the acuity was identical to what it was at the learned location. Performance dropped in all 4 experiments when the pattern had to be recognized at new test positions. The visual system does not seem to apply a global transposition transformation to the retinal image to compensate for translations but instead may decompose the image into simple features that are more or less translation invariant. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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