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Journal Article

Coordinate transformations in object recognition

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Graf, M. (2006). Coordinate transformations in object recognition. Psychological Bulletin, 132(6), 920-945. doi:10.1037/0033-2909.132.6.920.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-A661-3
A basic problem of visual perception is how human beings recognize objects after spatial transformations. Three central classes of findings have to be accounted for: (a) Recognition performance varies systematically with orientation, size, and position; (b) recognition latencies are sequentially additive, suggesting analogue transformation processes; and (c) orientation and size congruency effects indicate that recognition involves the adjustment of a reference frame. All 3 classes of findings can be explained by a transformational framework of recognition: Recognition is achieved by an analogue transformation of a perceptual coordinate system that aligns memory and input representations. Coordinate transformations can be implemented neurocomputationally by gain (amplitude) modulation and may be regarded as a general processing principle of the visual cortex.