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Coding of intention in the posterior parietal cortex

机译：顶叶后皮质的意图编码

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摘要

To look at or reach for what we see, spatial information from the visual system must be transformed into a motor plan. The posterior parietal cortex (PPC) is well placed to perform this function, because it lies between visual areas, which encode spatial information, and motor cortical areas. The PPC contains several subdivisions, which are generally conceived as high-order sensory areas. Neurons in area 7a and the lateral intraparietal area fire before and during visually guided saccades. Other neurons in areas 7a and 5 are active before and during visually guided arm movements. These areas are also active during memory tasks in which the animal remembers the location of a target for hundreds of milliseconds before making an eye or arm movement. Such activity could reflect either visual attention or the intention to make movements. This question is difficult to resolve, because even if the animal maintains fixation while directing attention to a peripheral location, the observed neuronal activity could reflect movements that are planned but not executed. To address this, we recorded from the PPC while monkeys planned either reaches or saccades to a single remembered location. We now report that, for most neurons, activity before the movement depended on the type of movement being planned. We conclude that PPC contains signals related to what the animal intends to do.
机译：为了观察或达到我们所看到的，必须将视觉系统中的空间信息转换为运动计划。顶叶后皮质（PPC）位置合适，可以执行此功能，因为它位于对空间信息进行编码的视觉区域和运动皮质区域之间。 PPC包含几个细分，这些细分通常被认为是高级感官区域。在视觉引导扫视之前和期间，区域7a和顶顶外侧区域的神经元会起火。在视觉引导的手臂移动之前和期间，区域7a和5中的其他神经元都处于活动状态。这些区域在记忆任务中也很活跃，在这些任务中，动物在进行眼睛或手臂移动之前会记住目标的位置数百毫秒。这种活动可以反映视觉注意力或做出动作的意图。这个问题很难解决，因为即使动物在将注意力转移到周围位置的同时保持固定，所观察到的神经元活动也可能反映出计划的但未执行的运动。为了解决这个问题，我们从PPC中记录了计划中的猴子到达或扫视到单个记忆位置的情况。我们现在报告，对于大多数神经元而言，运动之前的活动取决于所计划的运动类型。我们得出结论，PPC包含与动物打算做什么有关的信号。

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