Psychology, Neuroscience & Behaviour, Science, McMaster University, Hamilton, Ontario, Canada.
Computing and Software, Engineering, McMaster University, Hamilton, Ontario, Canada.
Neuroimage. 2019 May 1;191:68-80. doi: 10.1016/j.neuroimage.2019.02.015. Epub 2019 Feb 7.
Humans integrate visual and physical (vestibular and proprioceptive) cues to motion during self-motion perception. Theta and alpha-band oscillations have been associated with the processing of visual motion (e.g. optic flow). Alpha and beta-band oscillations have been shown to be associated with sensory-motor processing (e.g. walking). The present study examined modulation of theta, alpha, and beta oscillations while participants made heading direction judgments during a passive self-motion task which required selective attention to one of the simultaneously presented visual or physical motion stimuli. Attention to physical (while ignoring visual) motion produced a different time course of changes in spectral power compared to attention to visual (while ignoring physical) motion. We observed weaker theta event-related synchronization (ERS), as well as stronger beta and later onset of alpha event-related desynchronization (ERD) in the attend-physical condition compared to the attend-visual condition. We observed individual differences in terms of ability to perform the task. Specifically, some participants were not able to ignore or discount the visual input when visual and physical heading direction was incongruent; this was reflected by similar event-related spectral power for both conditions. The results demonstrated a possible electrophysiological signature of the time course of 1) cue conflict (congruency effects), 2) attention to specific motion cues, and 3) individual differences in perceptual weighting of motion stimuli (high-vs. low-accuracy effects).
人类在进行自我运动感知时，会整合视觉和身体（前庭和本体感觉）线索。θ 和 α 波段振荡与视觉运动（例如视流）的处理有关。α 和 β 波段振荡已被证明与感觉运动处理（例如行走）有关。本研究在参与者进行被动自运动任务时，检查了θ、α 和β 振荡的调制，该任务要求选择性地注意同时呈现的视觉或物理运动刺激之一。与注意视觉（同时忽略物理）运动相比，注意物理（同时忽略视觉）运动产生了不同的频谱功率变化时间过程。与注意视觉条件相比，在注意物理条件下，我们观察到较弱的θ 事件相关同步（ERS），以及更强的β 和较晚的α 事件相关去同步（ERD）。我们观察到参与者在执行任务方面存在个体差异。具体来说，当视觉和物理航向不一致时，一些参与者无法忽略或折扣视觉输入；这反映了两种情况下的事件相关频谱功率相似。结果表明，运动刺激的感知权重（高准确率与低准确率效应）存在可能的电生理特征，其特征为 1）线索冲突（一致性效应）、2）对特定运动线索的注意、和 3）个体差异。
