Less Is More: Expectation Sharpens Representations in the Primary Visual Cortex
Less Is More: Expectation Sharpens Representations in the Primary Visual Cortex
复制标题
DOI：
10.1016/j.neuron.2012.04.034
复制
发表时间：
2012-07-26
期刊：
影响因子：
16.2
通讯作者：
de Lange, Floris P.
中科院分区：
文献类型：
--
作者：
Kok, Peter;Jehee, Janneke F. M.;de Lange, Floris P.
先前对视觉世界的预期通过允许我们从嘈杂和模糊的数据中快速推断出合理的解释来促进感知。这种促进作用的神经机制在很大程度上仍不清楚。在这里，我们使用功能性磁共振成像（fMRI）和多变量模式分析（MVPA）技术来测量人类志愿者早期视觉皮层神经活动的幅度和代表性内容。我们发现，虽然知觉预期降低了初级视皮层（V1）的神经反应幅度，但它改善了该区域的刺激表征，如MVPA所揭示的那样。这种信息的改善是独立的注意调制任务的相关性。最后，当预期刺激特征相关时，V1中的信息改善与受试者的行为改善相关。这些数据表明，期望通过锐化感官表征来促进感知。
Prior expectations about the visual world facilitate perception by allowing us to quickly deduce plausible interpretations from noisy and ambiguous data. The neural mechanisms of this facilitation remain largely unclear. Here, we used functional magnetic resonance imaging (fMRI) and multivariate pattern analysis (MVPA) techniques to measure both the amplitude and representational content of neural activity in the early visual cortex of human volunteers. We find that while perceptual expectation reduces the neural response amplitude in the primary visual cortex (V1), it improves the stimulus representation in this area, as revealed by MVPA. This informational improvement was independent of attentional modulations by task relevance. Finally, the informational improvement in V1 correlated with subjects' behavioral improvement when the expected stimulus feature was relevant. These data suggest that expectation facilitates perception by sharpening sensory representations.