Zhou Yong-Di, Fuster Joaquín M
Department of Neurosurgery and Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, MD 21287, USA.
Behav Brain Res. 2004 Aug 31;153(2):573-8. doi: 10.1016/j.bbr.2003.12.024.
Neurons in the monkey's anterior parietal cortex (Brodmann's areas 3a, 3b, 1, and 2) have been reported to retain information from a visual cue that has been associated with a tactile stimulus in a haptic memory task. This cross-modal transfer indicates that neurons in somatosensory cortex can respond to non-tactile stimuli if they are associated with tactile information needed for performance of the task. We hypothesized that neurons in somatosensory cortex would be activated by other non-tactile stimuli signaling the haptic movements--of arm and hand--that the task required. We found such cells in anterior parietal areas. They reacted with short-latency activity changes to an auditory signal (a click) that prompted those movements. Further, some of those cells changed their discharge in temporal correlation with the movements themselves, with the touch of the test objects, and with the short-term memory of those objects for subsequent tactile discrimination. These findings suggest that cells in the somatosensory cortex participate in the behavioral integration of auditory stimuli with other sensory stimuli and with motor acts that are associated with those stimuli.
据报道，在猴子的前顶叶皮层（布罗德曼区3a、3b、1和2）中的神经元会在一个触觉记忆任务中保留来自与触觉刺激相关的视觉线索的信息。这种跨模态转移表明，如果体感皮层中的神经元与任务执行所需的触觉信息相关联，它们可以对非触觉刺激做出反应。我们假设，体感皮层中的神经元会被其他非触觉刺激激活，这些刺激信号表示任务所需的手臂和手部的触觉动作。我们在前顶叶区域发现了这样的细胞。它们对提示这些动作的听觉信号（咔哒声）以短潜伏期活动变化做出反应。此外，其中一些细胞的放电与动作本身、与测试物体的触摸以及与那些物体的短期记忆在时间上相关，以便随后进行触觉辨别。这些发现表明，体感皮层中的细胞参与了听觉刺激与其他感觉刺激以及与那些刺激相关的运动行为的行为整合
