Rees Geraint, Wojciulik Ewa, Clarke Karen, Husain Masud, Frith Chris, Driver Jon
Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK.
Neurocase. 2002;8(5):387-93. doi: 10.1076/neur.8.4.387.16190.
Brain areas activated by stimuli in the left visual field of a right parietal patient suffering from left visual extinction were identified using event-related functional magnetic resonance imaging. Left visual field stimuli that were extinguished from awareness still activated the ventral visual cortex, including areas in the damaged right hemisphere. An extinguished face stimulus on the left produced robust category-specific activation of the right fusiform face area. On trials where the left visual stimulus was consciously seen rather than extinguished, greater activity was found in the ventral visual cortex of the damaged hemisphere, and also in frontal and parietal areas of the intact hemisphere. These findings extend recent observations on visual extinction, suggesting distinct neural correlates for conscious and unconscious perception.
利用事件相关功能磁共振成像技术，确定了一名患有左侧视觉消退的右顶叶患者左视野刺激所激活的脑区。从意识中消失的左视野刺激仍能激活腹侧视觉皮层，包括受损右半球的区域。左侧的一个消失的面部刺激在右侧梭状回面孔区产生了强烈的类别特异性激活。在有意识地看到而非消失左视觉刺激的试验中，在受损半球的腹侧视觉皮层以及完整半球的额叶和顶叶区域发现了更大的活动。这些发现扩展了最近关于视觉消退的观察结果，表明有意识和无意识感知存在不同的神经关联。
