Stróżak Paweł, Francuz Piotr, Augustynowicz Paweł, Ratomska Marta, Fudali-Czyż Agnieszka, Bałaj Bibianna
Department of Experimental Psychology, The John Paul II Catholic University of Lublin, Al. Racławickie 14, 20-950, Lublin, Poland.
Faculty of Economics, Maria Curie Skłodowska University in Lublin, Plac Marii Curie-Skłodowskiej 5, 20-031, Lublin, Poland.
Exp Brain Res. 2016 Dec;234(12):3473-3482. doi: 10.1007/s00221-016-4748-8. Epub 2016 Aug 3.
The neural mechanisms underlying the vection illusion are not fully understood. A few studies have analyzed visually evoked potentials or event-related potentials (ERPs) when participants were exposed to vection-inducing stimulation. However, none of them tested how such stimulation influences the brain activity during performance of the simultaneous visual task. In the present study, ERPs were recorded while subjects (N = 19) performed a discrimination oddball task. Two stimuli (O or X) were presented on the background of central and peripheral visual fields consisting of altered black and white vertical stripes that were stationary or moving horizontally. Three different combinations of these fields were created: (1) both center and periphery stationary (control condition), (2) both center and periphery moving, (3) center stationary and periphery moving. Mean reaction times to targets were shortest in the control condition. The amplitudes of P1 and N2 at occipital locations, and the amplitude of P3 at frontal, central, and parietal locations, were attenuated, and the P3 exhibited longer peak latency when both central and peripheral visual fields were moving. These potentials reflect initial sensory processing and the degree of attention required for processing visual stimuli and performing the task. Our findings suggest that the integration of central and peripheral moving visual fields enhances the vection illusion and slows down reaction times to targets in the oddball task and disrupts the magnitude of electrophysiological responses to targets.
自我运动错觉背后的神经机制尚未完全明了。一些研究分析了参与者在受到诱发自我运动的刺激时的视觉诱发电位或事件相关电位（ERP）。然而，这些研究均未测试此类刺激如何在同时进行视觉任务时影响大脑活动。在本研究中，当受试者（N = 19）执行辨别oddball任务时记录了ERP。在由静止或水平移动的黑白垂直条纹组成的中央和周边视野背景上呈现两种刺激（O或X）。创建了这些视野的三种不同组合：（1）中央和周边均静止（对照条件），（2）中央和周边均移动，（3）中央静止而周边移动。在对照条件下对目标的平均反应时间最短。当中央和周边视野均移动时，枕部位置的P1和N2波幅以及额部、中央和顶叶位置的P3波幅减弱，且P3波峰潜伏期延长。这些电位反映了初始感觉处理以及处理视觉刺激和执行任务所需的注意力程度。我们的研究结果表明，中央和周边移动视野的整合增强了自我运动错觉，减慢了oddball任务中对目标的反应时间，并扰乱了对目标的电生理反应幅度。
