Hemispheric specialization of human inferior temporal cortex during coarse-to-fine and fine-to-coarse analysis of natural visual scenes

Article Article scientifique Article Hemispheric specialization of human inferior temporal cortex during coarse-to-fine and fine-to-coarse analysis of natural visual scenes eng 2005 author Peyrin Carole 590577 author Schwartz Sophie 0000-0001-7718-4053 35633 author Seghier Mohamed Lamine 133539 author Michel Christoph 91629 author Landis Theodor 24453 author Vuilleumier Patrik 0000-0002-8198-9214 134853 464-473 10.1016/j.neuroimage.2005.06.006 15993630 1053-8119 https://www.sciencedirect.com/science/article/pii/S1053811905004106 Recent models of visual recognition have suggested that perceptual analysis may start with a parallel extraction of different spatial frequencies (SF), using a preferential coarse-to-fine (low-to-high SF) sequence of processing. A rapid extraction of low spatial frequency (LSF) information may thus provide an initial and crude parsing of the visual scene, subsequently refined by slow but more detailed high spatial frequency (HSF) information. However, the sequence of SF analysis could be flexible, a high-to-low (HtL) being sometimes preferred to a low-to-high (LtH) SF sequence depending on task demands. Furthermore, it has also been suggested that the right vs. left hemisphere might be differentially specialized in LSF vs. HSF analysis, respectively. By manipulating the temporal succession of LSF and HSF stimuli, the present fMRI study investigated whether such hemispheric specialization may underlie the flexible use of different time-course in SF analysis. Participants performed a matching task between two successive images of natural scenes (LSF or HSF) that were displayed either in an LtH (LSF scene presented first and HSF scene second) or in a reverse HtL sequence. A direct inter-hemispheric comparison of the neural responses evoked by each SF sequence revealed greater activations within the right occipito-temporal cortex for the LtH sequence and within the left occipito-temporal cortex for the HtL sequence. These fMRI results suggest that the hemisphere preferentially engaged during the sequential processing of different SF might be determined by the initial SF-band appearing in this sequence, and that both a coarse-to-fine and fine-to-coarse analysis might independently take place in the two hemispheres. Adult Fixation, Ocular/physiology Functional Laterality/ physiology Humans Linear Models Magnetic Resonance Imaging Male Occipital Lobe/physiology Photic Stimulation Recognition (Psychology)/physiology Temporal Lobe/ physiology Visual Perception/ physiology Dewey 616.8 53 Département de neurosciences fondamentales 21A false 118 Organisation et plasticité des réseaux neuronaux cérébraux 148 NeuroImage 28 2 f6f4feeb-cb4f-4489-9cbe-275912ce87ef Article Restricted file1.pdf 285348 application/pdf restrictedAccess Faculté de médecine / Section de médecine fondamentale / Département de neurosciences fondamentales

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Hemispheric specialization of human inferior temporal cortex during coarse-to-fine and fine-to-coarse analysis of natural visual scenes	NeuroImage			2005	611	0

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Peyrin, Carole