Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia.
Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia
Proc Natl Acad Sci U S A. 2020 Nov 24;117(47):29925-29936. doi: 10.1073/pnas.2010749117. Epub 2020 Nov 11.
Object-based attention describes the brain's capacity to prioritize one set of stimuli while ignoring others. Human research suggests that the binding of diverse stimuli into one attended percept requires phase-locked oscillatory activity in the brain. Even insects display oscillatory brain activity during visual attention tasks, but it is unclear if neural oscillations in insects are selectively correlated to different features of attended objects. We addressed this question by recording local field potentials in the central complex, a brain structure involved in visual navigation and decision making. We found that attention selectively increased the neural gain of visual features associated with attended objects and that attention could be redirected to unattended objects by activation of a reward circuit. Attention was associated with increased beta (20- to 30-Hz) oscillations that selectively locked onto temporal features of the attended visual objects. Our results suggest a conserved function for the beta frequency range in regulating selective attention to salient visual features.
基于对象的注意力描述了大脑优先处理一组刺激而忽略其他刺激的能力。人类研究表明，将不同的刺激绑定到一个被注意的感知中需要大脑中的相位锁定振荡活动。即使是昆虫在视觉注意任务中也表现出振荡的大脑活动，但尚不清楚昆虫的神经振荡是否与被注意物体的不同特征选择性相关。我们通过记录中央复合体中的局部场电位来解决这个问题，中央复合体是一个参与视觉导航和决策的大脑结构。我们发现，注意力选择性地增加了与被注意物体相关的视觉特征的神经增益，并且通过激活奖励回路可以将注意力重新引导到未被注意的物体上。注意力与增加的β（20-30Hz）振荡相关联，该振荡选择性地锁定在被注意的视觉物体的时间特征上。我们的结果表明，β频带在调节对显著视觉特征的选择性注意方面具有保守的功能。
