Neural evidence for intermediate representations in object recognition.
The lateral occipital complex (LOC), a cortical region critical for human object recognition, has been shown to primarily code the shape, rather than the surface properties, of an object. But what aspects of shape? Using an fMRI-adaptation (fMRI-a) paradigm in which subjects judged whether two contour-deleted images of objects were the same or different exemplars, virtually all the adaptation in LOC [especially in LOC's most anterior portion (pFs)] could be attributed to repetition of the parts, almost none to the repetition of local image features, such as lines or vertices, templates, or basic- or subordinate-level concepts of the object. These results support the hypothesis that the neural representation of shape in LOC is an intermediate one, encoding the parts of an object.
Hayworth
Kenneth J
KJ
Neuroscience Program, University of Southern California, Hedco Neurosciences Bldg, Los Angeles, CA 90089-2520, USA. khaywort@usc.edu
Biederman
Irving
I
D000223:Adaptation, Psychological; D000328:Adult; D017352:Echo-Planar Imaging; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D016014:Linear Models; D008279:Magnetic Resonance Imaging; D008297:Male; D009483:Neuropsychological Tests; D009778:Occipital Lobe / Q000033:anatomy & histology / Q000502:physiology*; D010470:Perceptual Masking