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Title: Functional neuroanatomy of visual object categorisation at distinct levels based on shape processing: An fMRI study
Authors: Op de Beeck, Hans
Béatse, E.
Wagemans, Johan
Sunaert, Stefan
Van Hecke, Paul
Issue Date: 1999
Series Title: Perception vol:28 pages:10c
Conference: 22nd European Conference on Visual Perception (ECVP), Trieste, Italy date:August 1999
Abstract: Six healthy subjects participated in an fMRI experiment using BOLD contrast, while performing three tasks: (1) determining whether two successively presented nonsense shapes had the same global orientation (baseline task), (2) determining whether two successively presented natural objects belonged to the same basic level category, and (3) determining whether two successively presented objects represented the same exemplar of a category. Additionally, we manipulated the quality of stimulus presentation by degrading the stimuli in half of the trials by locally shifting the pixels constituting the lines of the figures. Both experimental tasks were associated with activations in the occipitotemporal and parietal cortex. There was no consistent difference between the two experimental tasks across subjects. Activation in an anterior focus in the fusiform gyrus (similar to the most anterior occipitotemporal activation foci in the task comparisons) was reduced when shape information was degraded, even in the baseline task. This suggests that even regions in the highest-order visual areas that are activated by the categorisation of stimuli are also activated by the bottom-up processing of shape.
Publication status: published
KU Leuven publication type: DI
Appears in Collections:Laboratory for Biological Psychology
Radiology
Laboratory for Experimental Psychology
Biomedical MRI
Translational MRI (+)

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