Analysis of perisaccadic field potentials in the occipitotemporal pathway during active vision.
Analysis of perisaccadic field potentials in the occipitotemporal pathway during active vision.
复制标题
主动视觉期间枕颞通路的扫视场电位分析。
DOI：
10.1152/jn.00011.2003
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发表时间：
2003
影响因子：
2.5
通讯作者：
Schiff,NicholasD
中科院分区：
文献类型：
--
作者：
Purpura,KeithP;Kalik,StevenF;Schiff,NicholasD
与扫视相关的眼动电位（EMPs）出现在灵长类视觉系统的皮层下和皮层结构中。在这项研究中，EMP记录跨网站在枕颞（OT）通路的猴子执行模式识别任务。我们的特点对记录扫视触发的局部场电位（LFPs）在早期的腹侧视觉通路的纹外和下颞区使用时间-频率频谱图。提取和分析频谱图的参数，包括在时间-频率平面中识别的感兴趣区域的质心。提取的参数的分布之间的比较表明，枕叶EMP主要是眼扫视发作后，通常不受影响的时间由扫视的方向或出现的刺激瞬态之前或之后的扫视集中在100毫秒的postsaccadic事件。枕叶电磁脉冲也表现出显着的频移内容在其短暂的时间过程中的影响，在少数情况下，由扫视方向。另一方面，颞叶EMP可能集中在扫视前或扫视后的时间间隔内;它们出现的时间受到扫视方向的显著影响。颞叶电磁脉冲表现出较少的频率调制比枕叶记录。OT通路中EMP的普遍存在表明，许多对模式识别很重要的皮层区域可以通过扫视来调节。这些信号的时间和频率特征表明，这种视近调制的性质在皮层中各不相同。
Eye movement potentials (EMPs) associated with saccades appear in both subcortical and cortical structures of the primate visual system. In this study, EMPs are recorded across sites in the occipitotemporal (OT) pathway of monkeys performing a pattern-recognition task. We characterize pair recordings of saccade-triggered local field potentials (LFPs) in early extrastriate and inferotemporal regions of the ventral visual pathway using time–frequency spectrograms. Parameters of the spectrograms, including the centroids of identified regions of interest in the time–frequency plane, are extracted and analyzed. Comparisons among the distributions of the extracted parameters reveal that the occipital lobe EMPs are largely postsaccadic events centered at 100 ms after saccade onset that are typically not influenced in timing by the direction of the saccade or the appearance of a stimulus transient appearing either before or after the saccade. The occipital lobe EMPs also demonstrate a significant shift in frequency content during their transient time course that is influenced, in a few cases, by saccade direction. Temporal lobe EMPs, on the other hand, may be centered in either the presaccadic or postsaccadic intervals; the time of their appearance is significantly influenced by the direction of the saccade. Temporal lobe EMPs demonstrate less frequency modulation than those recorded in the occipital lobe. The prevalence of EMPs in the OT pathway suggests that many cortical regions important for pattern recognition can be modulated by saccades. The timing and frequency characteristics of these signals suggest that the nature of this perisaccadic modulation varies across the cortex.