Schweitzer Richard, Seel Thomas, Raisch Jörg, Rolfs Martin
Centro Interdipartimentale di Mente e Cervello, Università degli studi di Trento, Trento, Italy.
Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany.
PLoS Comput Biol. 2025 Sep 29;21(9):e1013544. doi: 10.1371/journal.pcbi.1013544. eCollection 2025 Sep.
Eye movements routinely induce motion streaks as they shift visual projections across the retina at high speeds. To investigate the visual consequences of intra-saccadic motion streaks, we co-registered eye tracking and EEG while gaze-contingently shifting target objects during saccades, presenting either continuous, 'streaky' or apparent, step-like motion in four directions. We found significant reductions of secondary saccade latency, as well as improved decoding of the post-saccadic target location from the EEG signal when motion streaks were available. These signals arose as early as 50 ms after saccade offset and had a clear occipital topography. Using a physiologically plausible visual processing model, we provide evidence that the target's motion trajectory is coded in orientation-selective channels and that speed of gaze correction was linked to the visual dynamics arising from the combination of saccadic and target motion, providing a parsimonious explanation of the behavioral benefits of intra-saccadic motion streaks.
眼睛运动在高速将视觉投影在视网膜上移动时通常会产生运动条纹。为了研究扫视运动中运动条纹的视觉后果，我们在扫视过程中注视相关地移动目标物体时，同时记录眼动追踪和脑电图（EEG），在四个方向上呈现连续的、“条纹状”或明显的、阶梯状运动。我们发现，当有运动条纹时，二次扫视潜伏期显著缩短，并且从EEG信号中对扫视后目标位置的解码得到改善。这些信号在扫视结束后最早50毫秒出现，并且具有明显的枕叶地形图。使用一个生理上合理的视觉处理模型，我们提供证据表明目标的运动轨迹在方向选择性通道中编码，并且注视校正速度与扫视运动和目标运动相结合产生的视觉动态相关，为扫视运动中运动条纹的行为益处提供了一个简洁的解释。
