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首页> 外文期刊>Experimental Brain Research >Neuronal dynamics of bottom-up and top-down processes in area V4 of macaque monkeys performing a visual search
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Neuronal dynamics of bottom-up and top-down processes in area V4 of macaque monkeys performing a visual search

机译：进行视觉搜索的猕猴V4区域自下而上和自上而下过程的神经元动力学

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Visual selection is thought to be guided by both bottom-up intrinsic visual saliency and top-down visual attention. We examined how the relative importance of each of these processes dynamically changes over the course of a visual search in area V4 of two macaque monkeys. The animals were trained to perform a multidimensional visual search task in which a search array that consisted of two singleton stimuli, unique in shape and color, and four nonsingleton stimuli was presented. The task was to select one of the singletons as the saccade target, depending on the instructed search dimension, which was switched between shape and color. The strengths of the neural modulations caused by the bottom-up and top-down factors were, respectively, evaluated by assessing the dependence of the visual responses on the singleton type and the behavioral significance of the receptive field stimulus. We found that the initial visual responses of V4 neurons predominantly specified the singleton type of the receptive field stimulus, while the late presaccadic response primarily specified its behavioral significance. For comparison, recordings were also made from the frontal eye field (FEF) of one monkey and we found that the predominant activity of FEF neurons signaled the behavioral significance of the receptive field stimulus over time. These findings suggest that area V4 might function as an intermediate stage where both sensory- and behavior-based signals are dynamically represented, depending on their online requirements during a visual search, whereas the FEF predominantly represents behavior-based signals for upcoming saccade responses.
机译：视觉选择被认为由自下而上的内在视觉显着性和自上而下的视觉注意力所指导。我们研究了在两只猕猴V4区域的视觉搜索过程中，每个过程的相对重要性如何动态变化。训练这些动物以执行多维视觉搜索任务，其中提出了一个搜索数组，该数组由两个形状和颜色独特的单例刺激和四个非单例刺激组成。任务是根据指示的搜索尺寸，选择一个单例作为扫视目标，并在形状和颜色之间进行切换。由下而上和自上而下的因素所引起的神经调节的强度分别通过评估视觉反应对单例类型的依赖性和感受野刺激的行为意义来评估。我们发现，V4神经元的初始视觉反应主要指定了感受野刺激的单例类型，而后期的眼前反应则主要说明了其行为意义。为了进行比较，还从一只猴子的额叶视野（FEF）进行了记录，我们发现FEF神经元的主要活动随时间推移表明了感受野刺激的行为重要性。这些发现表明，V4区域可能充当中间阶段，根据视觉搜索过程中的在线需求，动态感知基于感官和行为的信号，而FEF主要代表即将到来的扫视响应的基于行为的信号。

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