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Object representations for multiple visual categories overlap in lateral occipital and medial fusiform cortex

(2009) CEREBRAL CORTEX. 19(8). p.1806-1819
Author
Organization
Abstract
How representations of visual objects are maintained across changes in viewpoint is a central issue in visual perception. Whether neural processes underlying view-invariant recognition involve distinct subregions within extrastriate visual cortex for distinct categories of visual objects remains unresolved. We used event-related functional magnetic resonance imaging in 16 healthy volunteers to map visual cortical areas responding to a large set (156) of exemplars from 3 object categories (faces, houses, and chairs), each repeated once after a variable time lag (3-7 intervening stimuli). Exemplars were repeated with the same viewpoint (but different retinal size) or with different viewpoint and size. The task was kept constant across object categories (judging items as "young" vs. "old"). We identified object-selective adaptation effects by comparing neural responses to the first presentation versus repetition of each individual exemplar. We found that exemplar-specific adaptation effects partly overlapped with regions showing category-selective responses (as identified using a separate localizer scan). These included the lateral fusiform gyrus (FG) for faces, parahippocampal gyrus for houses, and lateral occipital complex (LOC) for chairs. In face-selective fusiform gyrus (FG), adaptation effects occurred only for faces repeated with the same viewpoint, but not with a different viewpoint, confirming previous studies using faces only. By contrast, a region in right medial FG, adjacent to but nonoverlapping with the more lateral and face-selective FG, showed repetition effects for faces and to a lesser extent for other objects, regardless of changes in viewpoint or in retinal image-size. Category- and viewpoint-independent repetition effects were also found in bilateral LOC. Our results reveal a common neural substrate in bilateral LOC and right medial FG underlying view-invariant and category-independent recognition for multiple object identities, with only a relative preference for faces in medial FG but no selectivity in LOC.
Keywords
category selectivity, MONKEY INFEROTEMPORAL CORTEX, face recognition, fusiform face area, fusiform gyrus, lateral occipital cortex, object recognition, repetition priming, unfamiliar objects, view invariance, viewpoint sensitivity, viewpoint transformation, SELECTIVE CORTEX, MENTAL ROTATION, DISTINCT REPRESENTATIONS, 3-DIMENSIONAL OBJECTS, NEURAL MECHANISMS, DISTRIBUTED REPRESENTATION, EVENT-RELATED FMRI, FACE RECOGNITION, HUMAN EXTRASTRIATE CORTEX

Citation

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MLA
Pourtois, Gilles, et al. “Object Representations for Multiple Visual Categories Overlap in Lateral Occipital and Medial Fusiform Cortex.” CEREBRAL CORTEX, vol. 19, no. 8, 2009, pp. 1806–19, doi:10.1093/cercor/bhn210.
APA
Pourtois, G., Schwartz, S., Spiridon, M., Martuzzi, R., & Vuilleumier, P. (2009). Object representations for multiple visual categories overlap in lateral occipital and medial fusiform cortex. CEREBRAL CORTEX, 19(8), 1806–1819. https://doi.org/10.1093/cercor/bhn210
Chicago author-date
Pourtois, Gilles, S Schwartz, M Spiridon, R Martuzzi, and P Vuilleumier. 2009. “Object Representations for Multiple Visual Categories Overlap in Lateral Occipital and Medial Fusiform Cortex.” CEREBRAL CORTEX 19 (8): 1806–19. https://doi.org/10.1093/cercor/bhn210.
Chicago author-date (all authors)
Pourtois, Gilles, S Schwartz, M Spiridon, R Martuzzi, and P Vuilleumier. 2009. “Object Representations for Multiple Visual Categories Overlap in Lateral Occipital and Medial Fusiform Cortex.” CEREBRAL CORTEX 19 (8): 1806–1819. doi:10.1093/cercor/bhn210.
Vancouver
1.
Pourtois G, Schwartz S, Spiridon M, Martuzzi R, Vuilleumier P. Object representations for multiple visual categories overlap in lateral occipital and medial fusiform cortex. CEREBRAL CORTEX. 2009;19(8):1806–19.
IEEE
[1]
G. Pourtois, S. Schwartz, M. Spiridon, R. Martuzzi, and P. Vuilleumier, “Object representations for multiple visual categories overlap in lateral occipital and medial fusiform cortex,” CEREBRAL CORTEX, vol. 19, no. 8, pp. 1806–1819, 2009.
@article{4289143,
  abstract     = {{How representations of visual objects are maintained across changes in viewpoint is a central issue in visual perception. Whether neural processes underlying view-invariant recognition involve distinct subregions within extrastriate visual cortex for distinct categories of visual objects remains unresolved. We used event-related functional magnetic resonance imaging in 16 healthy volunteers to map visual cortical areas responding to a large set (156) of exemplars from 3 object categories (faces, houses, and chairs), each repeated once after a variable time lag (3-7 intervening stimuli). Exemplars were repeated with the same viewpoint (but different retinal size) or with different viewpoint and size. The task was kept constant across object categories (judging items as "young" vs. "old"). We identified object-selective adaptation effects by comparing neural responses to the first presentation versus repetition of each individual exemplar. We found that exemplar-specific adaptation effects partly overlapped with regions showing category-selective responses (as identified using a separate localizer scan). These included the lateral fusiform gyrus (FG) for faces, parahippocampal gyrus for houses, and lateral occipital complex (LOC) for chairs. In face-selective fusiform gyrus (FG), adaptation effects occurred only for faces repeated with the same viewpoint, but not with a different viewpoint, confirming previous studies using faces only. By contrast, a region in right medial FG, adjacent to but nonoverlapping with the more lateral and face-selective FG, showed repetition effects for faces and to a lesser extent for other objects, regardless of changes in viewpoint or in retinal image-size. Category- and viewpoint-independent repetition effects were also found in bilateral LOC. Our results reveal a common neural substrate in bilateral LOC and right medial FG underlying view-invariant and category-independent recognition for multiple object identities, with only a relative preference for faces in medial FG but no selectivity in LOC.}},
  author       = {{Pourtois, Gilles and Schwartz, S and Spiridon, M and Martuzzi, R and Vuilleumier, P}},
  issn         = {{1047-3211}},
  journal      = {{CEREBRAL CORTEX}},
  keywords     = {{category selectivity,MONKEY INFEROTEMPORAL CORTEX,face recognition,fusiform face area,fusiform gyrus,lateral occipital cortex,object recognition,repetition priming,unfamiliar objects,view invariance,viewpoint sensitivity,viewpoint transformation,SELECTIVE CORTEX,MENTAL ROTATION,DISTINCT REPRESENTATIONS,3-DIMENSIONAL OBJECTS,NEURAL MECHANISMS,DISTRIBUTED REPRESENTATION,EVENT-RELATED FMRI,FACE RECOGNITION,HUMAN EXTRASTRIATE CORTEX}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{1806--1819}},
  title        = {{Object representations for multiple visual categories overlap in lateral occipital and medial fusiform cortex}},
  url          = {{http://doi.org/10.1093/cercor/bhn210}},
  volume       = {{19}},
  year         = {{2009}},
}

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