Fiehler Katja, Burke Michael, Engel Annerose, Bien Siegfried, Rösler Frank
Department of Experimental and Biological Psychology, Philipps-Universität Marburg, Gutenbergstr. 18, D-35032 Marburg, Germany.
Cereb Cortex. 2008 Feb;18(2):243-53. doi: 10.1093/cercor/bhm071. Epub 2007 Jun 4.
There is wide agreement that the "dorsal (action) stream" processes visual information for movement control. However, movements depend not only on vision but also on tactile and kinesthetic information (=haptics). Using functional magnetic resonance imaging, the present study investigates to what extent networks within the dorsal stream are also utilized for kinesthetic action control and whether they are also involved in kinesthetic working memory. Fourteen blindfolded participants performed a delayed-recognition task in which right-handed movements had to be encoded, maintained, and later recognized without any visual feedback. Encoding of hand movements activated somatosensory areas, superior parietal lobe (dorsodorsal stream), anterior intraparietal sulcus (aIPS) and adjoining areas (ventrodorsal stream), premotor cortex, and occipitotemporal cortex (ventral stream). Short-term maintenance of kinesthetic information elicited load-dependent activity in the aIPS and adjacent anterior portion of the superior parietal lobe (ventrodorsal stream) of the left hemisphere. We propose that the action representation system of the dorsodorsal and ventrodorsal stream is utilized not only for visual but also for kinesthetic action control. Moreover, the present findings demonstrate that networks within the ventrodorsal stream, in particular the left aIPS and closely adjacent areas, are also engaged in working memory maintenance of kinesthetic information.
人们普遍认为，“背侧（动作）流”处理用于运动控制的视觉信息。然而，动作不仅依赖视觉，还依赖触觉和动觉信息（=触觉）。本研究使用功能磁共振成像，调查背侧流中的神经网络在多大程度上也用于动觉动作控制，以及它们是否也参与动觉工作记忆。14名被蒙住眼睛的参与者执行了一项延迟识别任务，在该任务中，右手动作必须在没有任何视觉反馈的情况下进行编码、维持，随后进行识别。手部动作的编码激活了体感区域、顶上叶（背背侧流）、顶内沟前部（aIPS）和相邻区域（腹背侧流）、运动前皮质和枕颞皮质（腹侧流）。动觉信息的短期维持在左半球的aIPS和顶上叶相邻前部（腹背侧流）引发了负荷依赖性活动。我们提出，背背侧流和腹背侧流的动作表征系统不仅用于视觉动作控制，也用于动觉动作控制。此外，本研究结果表明，腹背侧流中的神经网络，特别是左aIPS及其紧邻区域，也参与动觉信息的工作记忆维持。
