School of Psychology, University of East London, UK.
Neuroimage. 2011 Jul 15;57(2):513-25. doi: 10.1016/j.neuroimage.2011.04.035. Epub 2011 Apr 29.
The effects of attention and object configuration on the neural responses to short-lag visual image repetition were investigated with fMRI. Attention to one of two object images in a prime display was cued spatially. The images were either intact or split vertically; a manipulation that negates the influence of view-based representations. A subsequent single intact probe image was named covertly. Behavioural priming observed as faster button presses was found for attended primes in both intact and split configurations, but only for uncued primes in the intact configuration. In a voxel-wise analysis, fMRI repetition suppression (RS) was observed in a left mid-fusiform region for attended primes, both intact and split, whilst a right intraparietal region showed repetition enhancement (RE) for intact primes, regardless of attention. In a factorial analysis across regions of interest (ROIs) defined from independent localiser contrasts, RS for attended objects in the ventral stream was significantly left-lateralised, whilst repetition effects in ventral and dorsal ROIs correlated with the amount of priming in specific conditions. These fMRI results extend hybrid theories of object recognition, implicating left ventral stream regions in analytic processing (requiring attention), consistent with prior hypotheses about hemispheric specialisation, and implicating dorsal stream regions in holistic processing (independent of attention).
本研究采用 fMRI 技术考察了注意和目标配置对短滞后视觉图像重复的神经反应的影响。在先导显示中，对两个目标图像之一的注意通过空间线索提示。这些图像要么完整，要么垂直分割；这种操作否定了基于视图的表示的影响。随后，一个单独的完整探测图像被秘密命名。观察到的行为启动表现为，在完整和分割两种配置下，对注意到的启动图像的按钮按压更快，但仅在完整配置下，对未提示的启动图像也是如此。在体素水平分析中，对于注意到的启动图像，无论是完整的还是分割的，左中部梭状回区域都观察到 fMRI 重复抑制（RS），而右顶内回区域则对完整的启动图像表现出重复增强（RE），而与注意无关。在跨感兴趣区域（ROI）的因子分析中，从独立的局部对比定义 ROI，腹侧流中注意到的目标的 RS 明显偏向左侧，而腹侧和背侧 ROI 中的重复效应与特定条件下的启动量相关。这些 fMRI 结果扩展了对象识别的混合理论，表明左腹侧流区域参与分析处理（需要注意），与关于半球专门化的先前假设一致，并表明背侧流区域参与整体处理（与注意无关）。
