title: Coordinate transformations in object recognition.
abstract: 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.
authors.affiliation: Max Planck Institute for Biological Cybernetics, Cognitive and Computational Psychophysics, Tübingen, Germany. markus.graf@gmail.com
authors.forename: Markus
authors.initials: M
authors.lastname: Graf
mesh_terms: D004193:Discrimination Learning / Q000502:physiology*; D006801:Humans; D008570:Memory, Short-Term / Q000502:physiology*; D008960:Models, Psychological; D009483:Neuropsychological Tests; D009949:Orientation / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011340:Problem Solving / Q000502:physiology; D011930:Reaction Time; D013028:Space Perception / Q000502:physiology; D013647:Task Performance and Analysis