Multivariate Patterns in Object-Selective Cortex Dissociate Perceptual and Physical Shape Similarity

@article{citeulike:3063683, abstract = {Prior research has identified the lateral occipital complex (LOC) as a critical cortical region for the representation of object shape in humans. However, little is known about the nature of the representations contained in the LOC and their relationship to the perceptual experience of shape. We used human functional MRI to measure the physical, behavioral, and neural similarity between pairs of novel shapes to ask whether the representations of shape contained in subregions of the LOC more closely reflect the physical stimuli themselves, or the perceptual experience of those stimuli. Perceptual similarity measures for each pair of shapes were obtained from a psychophysical same-different task; physical similarity measures were based on stimulus parameters; and neural similarity measures were obtained from multivoxel pattern analysis methods applied to anterior LOC (pFs) and posterior LOC (LO). We found that the pattern of pairwise shape similarities in LO most closely matched physical shape similarities, whereas shape similarities in pFs most closely matched perceptual shape similarities. Further, shape representations were similar across participants in LO but highly variable across participants in pFs. Together, these findings indicate that activation patterns in subregions of object-selective cortex encode objects according to a hierarchy, with stimulus-based representations in posterior regions and subjective and observer-specific representations in anterior regions.}, author = {Haushofer, Johannes and Livingstone, Margaret S. and Kanwisher, Nancy }, citeulike-article-id = {3063683}, doi = {http://dx.doi.org/10.1371/journal.pbio.0060187}, journal = {PLoS Biology}, keywords = {bob, heather, shiva, visionlab}, month = {July}, number = {7}, pages = {e187+}, posted-at = {2008-07-30 17:18:22}, priority = {2}, title = {Multivariate Patterns in Object-Selective Cortex Dissociate Perceptual and Physical Shape Similarity}, url = {http://dx.doi.org/10.1371/journal.pbio.0060187}, volume = {6}, year = {2008} }

TY - JOUR ID - citeulike:3063683 L3 - citeulike-article-id:3063683 TI - Multivariate Patterns in Object-Selective Cortex Dissociate Perceptual and Physical Shape Similarity JF - PLoS Biology VL - 6 IS - 7 SP - e187 N2 - Prior research has identified the lateral occipital complex (LOC) as a critical cortical region for the representation of object shape in humans. However, little is known about the nature of the representations contained in the LOC and their relationship to the perceptual experience of shape. We used human functional MRI to measure the physical, behavioral, and neural similarity between pairs of novel shapes to ask whether the representations of shape contained in subregions of the LOC more closely reflect the physical stimuli themselves, or the perceptual experience of those stimuli. Perceptual similarity measures for each pair of shapes were obtained from a psychophysical same-different task; physical similarity measures were based on stimulus parameters; and neural similarity measures were obtained from multivoxel pattern analysis methods applied to anterior LOC (pFs) and posterior LOC (LO). We found that the pattern of pairwise shape similarities in LO most closely matched physical shape similarities, whereas shape similarities in pFs most closely matched perceptual shape similarities. Further, shape representations were similar across participants in LO but highly variable across participants in pFs. Together, these findings indicate that activation patterns in subregions of object-selective cortex encode objects according to a hierarchy, with stimulus-based representations in posterior regions and subjective and observer-specific representations in anterior regions. KW - bob KW - heather KW - shiva KW - visionlab AU - Haushofer, Johannes AU - Livingstone, Margaret AU - Kanwisher, Nancy PY - 2008/07/01/ UR - http://dx.doi.org/10.1371/journal.pbio.0060187 ER -