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首页> 外文期刊>The European Journal of Neuroscience >Spatial and temporal distribution of visual information coding in lateral prefrontal cortex
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Spatial and temporal distribution of visual information coding in lateral prefrontal cortex

机译：横向前额叶皮质中视觉信息编码的空间和时间分布

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摘要

Prefrontal neurons code many kinds of behaviourally relevant visual information. In behaving monkeys, we used a cued target detection task to address coding of objects, behavioural categories and spatial locations, examining the temporal evolution of neural activity across dorsal and ventral regions of the lateral prefrontal cortex (encompassing parts of areas 9, 46, 45A and 8A), and across the two cerebral hemispheres. Within each hemisphere there was little evidence for regional specialisation, with neurons in dorsal and ventral regions showing closely similar patterns of selectivity for objects, categories and locations. For a stimulus in either visual field, however, there was a strong and temporally specific difference in response in the two cerebral hemispheres. In the first part of the visual response (50-250ms from stimulus onset), processing in each hemisphere was largely restricted to contralateral stimuli, with strong responses to such stimuli, and selectivity for both object and category. Later (300-500ms), responses to ipsilateral stimuli also appeared, many cells now responding more strongly to ipsilateral than to contralateral stimuli, and many showing selectivity for category. Activity on error trials showed that late activity in both hemispheres reflected the animal's final decision. As information is processed towards a behavioural decision, its encoding spreads to encompass large, bilateral regions of prefrontal cortex.
机译：前额外神经元代码多种行为相关的视觉信息。在表现猴子时，我们使用了一个CUET目标检测任务来解决对象，行为类别和空间位置的编码，检查横向前额落皮层的背侧和腹侧区域的神经活动的时间演变（包括区域9,46,45a的部分和8a），并横跨两种脑半球。在每个半球内几乎没有迹象表明区域专业化，背部和腹侧区域中的神经元显示出对象，类别和地点的选择性密切相关。然而，对于视野中的刺激，在两个脑半球中的响应中存在强烈且时间的特异性。在视觉响应的第一部分（来自刺激发作的50-250ms）中，每个半球的加工在很大程度上仅限于对侧刺激，对这种刺激的强烈反应，以及对象和类别的选择性。后来（300-500ms），对同侧刺激的反应也出现，许多细胞现在对同侧的反应比对侧刺激更强，以及许多表现出类别的选择性。错误试验的活动表明，两个半球的晚期活动都反映了动物的最终决定。随着信息的处理朝向行为决策，其编码蔓延到涵盖前额叶皮质的大，双侧区域。

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