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

被引:47
|
作者
Peyrin, C
Schwartz, S
Seghier, M
Michel, C
Landis, T
Vuilleumier, P
机构
[1] Univ Geneva, Med Ctr, Neurol Clin, Lab Neurol & Imaging Cognit, CH-1211 Geneva, Switzerland
[2] Univ Geneva, Med Ctr, Dept Neurosci, CH-1211 Geneva, Switzerland
[3] Univ Geneva, Univ Hosp, Neurol Clin, Funct Brain Mapping Lab, CH-1211 Geneva, Switzerland
[4] Univ Pierre Mendes France, CNRS, UMR 5105, Lab Psychol & NeuroCognit, F-38040 Grenoble, France
[5] Univ Hosp Geneva, Dept Radiol, Geneva, Switzerland
[6] Univ Hosp Geneva, Neurol Clin, Geneva, Switzerland
关键词
visual recognition; natural scene; spatial frequency; cerebral asymmetry; occipito-temporal cortex; event-related IMRI; coarse-to-fine; fine-to-coarse;
D O I
10.1016/j.neuroimage.2005.06.006
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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 occipitotemporal cortex for the LtH sequence and within the left occipitotemporal 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. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:464 / 473
页数:10
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