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首页> 外文期刊>The European Journal of Neuroscience >Perceptual experience modulates cortical circuits involved in visual awareness
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Perceptual experience modulates cortical circuits involved in visual awareness

机译：知觉经验调节涉及视觉意识的皮质回路

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Successful interactions with the environment entail interpreting ambiguous sensory information. To address this challenge it has been suggested that the brain optimizes performance through experience. Here we used functional magnetic resonance imaging (fMRI) to investigate whether perceptual experience modulates the cortical circuits involved in visual awareness. Using ambiguous visual stimuli (binocular rivalry or ambiguous structure-from-motion) we were able to disentangle the co-occurring influences of stimulus repetition and perceptual repetition. For both types of ambiguous stimuli we observed that the mere repetition of the stimulus evoked an entirely different pattern of activity modulations than the repetition of a particular perceptual interpretation of the stimulus. Regarding stimulus repetition, decreased fMRI responses were evident during binocular rivalry but weaker during 3-D motion rivalry. Perceptual repetition, on the other hand, entailed increased activity in stimulus-specific visual brain regions - for binocular rivalry in the early visual regions and for ambiguous structure-from-motion in both early as well as higher visual regions. This indicates that the repeated activation of a visual network mediating a particular percept facilitated its later reactivation. Perceptual repetition was also associated with a response change in the parietal cortex that was similar for the two types of ambiguous stimuli, possibly relating to the temporal integration of perceptual information. We suggest that perceptual repetition is associated with a facilitation of neural activity within and between percept-specific visual networks and parietal networks involved in the temporal integration of perceptual information, thereby enhancing the stability of previously experienced percepts.
机译：与环境的成功交互需要解释模棱两可的感官信息。为了应对这一挑战，有人建议大脑通过经验来优化表现。在这里，我们使用功能磁共振成像（fMRI）来调查知觉体验是否调节了涉及视觉意识的皮层回路。使用模棱两可的视觉刺激（双眼竞争或模棱两可的运动结构），我们能够弄清刺激重复和知觉重复的共同影响。对于两种类型的模棱两可的刺激，我们观察到，与重复对刺激的特定感性解释的重复相比，仅重复刺激会引起完全不同的活动调节模式。关于刺激的重复，fMRI反应在双眼竞争中很明显，但在3D运动竞争中却较弱。另一方面，知觉重复在刺激特定的视觉脑区中增加了活动-早期视觉区中的双眼竞争以及早期和较高视觉区中运动的歧义结构。这表明介导特定感知的视觉网络的重复激活有助于其稍后的重新激活。知觉重复还与顶叶皮层的反应变化有关，这对于两种类型的歧义刺激是相似的，可能与知觉信息的时间整合有关。我们建议知觉重复与在知觉信息的时间整合中涉及的知觉特异性视觉网络和顶叶网络内部和之间的神经活动的促进有关，从而增强先前经历过的知觉的稳定性。

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