Duke University, Durham, NC 27708, USA.
J Cogn Neurosci. 2011 Nov;23(11):3209-17. doi: 10.1162/jocn_a_00065. Epub 2011 May 13.
The specific role of different parietal regions to episodic retrieval is a topic of intense debate. According to the Attention to Memory (AtoM) model, dorsal parietal cortex (DPC) mediates top-down attention processes guided by retrieval goals, whereas ventral parietal cortex (VPC) mediates bottom-up attention processes captured by the retrieval output or the retrieval cue. This model also hypothesizes that the attentional functions of DPC and VPC are similar for memory and perception. To investigate this last hypothesis, we scanned participants with event-related fMRI whereas they performed memory and perception tasks, each comprising an orienting phase (top-down attention) and a detection phase (bottom-up attention). The study yielded two main findings. First, consistent with the AtoM model, orienting-related activity for memory and perception overlapped in DPC, whereas detection-related activity for memory and perception overlapped in VPC. The DPC overlap was greater in the left intraparietal sulcus, and the VPC overlap in the left TPJ. Around overlapping areas, there were differences in the spatial distribution of memory and perception activations, which were consistent with trends reported in the literature. Second, both DPC and VPC showed stronger connectivity with medial-temporal lobe during the memory task and with visual cortex during the perception task. These findings suggest that, during memory tasks, some parietal regions mediate similar attentional control processes to those involved in perception tasks (orienting in DPC vs. detection in VPC), although on different types of information (mnemonic vs. sensory).
顶叶区域在情节检索中的特定作用是一个激烈争论的话题。根据注意到记忆（AtoM）模型，背侧顶叶皮层（DPC）介导由检索目标引导的自上而下的注意过程，而腹侧顶叶皮层（VPC）介导由检索输出或检索线索捕获的自下而上的注意过程。该模型还假设 DPC 和 VPC 的注意力功能对于记忆和感知是相似的。为了研究这最后一个假设，我们在参与者进行记忆和感知任务时使用事件相关 fMRI 对他们进行扫描，每个任务都包括定向阶段（自上而下的注意力）和检测阶段（自下而上的注意力）。该研究得出了两个主要发现。首先，与 AtoM 模型一致，记忆和感知的定向相关活动在 DPC 中重叠，而记忆和感知的检测相关活动在 VPC 中重叠。DPC 的重叠在左侧顶内沟中更大，而 VPC 的重叠在左侧 TPJ 中。在重叠区域周围，记忆和感知激活的空间分布存在差异，这与文献中报道的趋势一致。其次，DPC 和 VPC 都在记忆任务期间与内侧颞叶显示出更强的连通性，而在感知任务期间与视觉皮层显示出更强的连通性。这些发现表明，在记忆任务期间，一些顶叶区域介导与感知任务类似的注意力控制过程（DPC 中的定向与 VPC 中的检测），尽管涉及不同类型的信息（记忆与感官）。
