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The Journal of Neuroscience, April 27, 2005, 25(17):4294-4306; doi:10.1523/JNEUROSCI.0377-05.2005

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Behavioral/Systems/Cognitive
Using Functional Magnetic Resonance Imaging to Assess Adaptation and Size Invariance of Shape Processing by Humans and Monkeys

Hiromasa Sawamura,¹ Svetlana Georgieva,¹ Rufin Vogels,¹ Wim Vanduffel,^1,2 and G. A. Orban¹

¹Laboratorium voor Neuroen Psychofysiologie, K.U. Leuven Medical School, Campus Gashuisberg, B-3000 Leuven, Belgium, and ²Massachusetts General Hospital, Massachusetts Institute of Technology, Harvard Medical School, Athinoula A. Martino's Center for Biomedical Imaging, Charlestown, Massachusetts 02129

Functional magnetic resonance imaging in awake monkeys and humans was used to compare object adaptation in shape-sensitive regions of these two species under identical and different size conditions. Object adaptation was similar in humans and monkeys under both conditions. Neither species showed complete size invariance, in agreement with single-cell studies. Both the macaque inferotemporal (IT) complex and human lateral occipital complex (LOC) displayed an anteroposterior gradient in object adaptation and size invariance, with the more anterior regions being more adaptable and size invariant. The results provide additional evidence for the homology between the macaque IT cortex and human LOC but also add to the growing list of differences between human and monkey intraparietal sulcus regions.

Key words: functional imaging; object adaptation; size invariance; vision; cerebral cortex; human and macaque

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Received July 20, 2004; revised March 21, 2005; accepted March 21, 2005.

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