Cerebral Cortex Advance Access published online on February 5, 2007
Cerebral Cortex, doi:10.1093/cercor/bhl180
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Distinct and Convergent Visual Processing of High and Low Spatial Frequency Information in Faces
1 Behavioural Brain Science Centre, School of Psychology, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK, 2 Wellcome Centre for Neuroimaging at University College London, UK, 3 Laboratory for Neurology and Imaging of Cognition, Department of Neuroscience and Clinic of Neurology, University Medical Centre, Geneva, Switzerland, 4 UCL Institute of Cognitive Neuroscience and Department of Psychology, University College London, UK
Address correspondence to email: P.Rotshtein{at}bham.ac.uk.
We tested for differential brain response to distinct spatial frequency (SF) components in faces. During a functional magnetic resonance imaging experiment, participants were presented with "hybrid" faces containing superimposed low and high SF information from different identities. We used a repetition paradigm where faces at either SF range were independently repeated or changed across consecutive trials. In addition, we manipulated which SF band was attended. Our results suggest that repetition and attention affected partly overlapping occipitotemporal regions but did not interact. Changes of high SF faces increased responses of the right inferior occipital gyrus (IOG) and left inferior temporal gyrus (ITG), with the latter response being also modulated additively by attention. In contrast, the bilateral middle occipital gyrus (MOG) responded to repetition and attention manipulations of low SF. A common effect of high and low SF repetition was observed in the right fusiform gyrus (FFG). Follow-up connectivity analyses suggested direct influence of the MOG (low SF), IOG, and ITG (high SF) on the FFG responses. Our results reveal that different regions within occipitotemporal cortex extract distinct visual cues at different SF ranges in faces and that the outputs from these separate processes project forward to the right FFG, where the different visual cues may converge.
Key Words: attention • DCM • fMRI • human • occipitotemporal cortex • repetition
Funding to pay the Open Access publication charges for this article was provided by the Wellcome Trust.
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