Department of Cognitive Neuroscience, Maastricht Brain Imaging Centre (MBIC) Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, Netherlands.
Maastricht Center of Systems Biology (MACSBIO), Faculty of Science & Engineering, Maastricht University, Maastricht, Netherlands.
Elife. 2020 Jun 4;9:e50933. doi: 10.7554/eLife.50933.
Human visual surface perception has neural correlates in early visual cortex, but the role of feedback during surface segmentation in human early visual cortex remains unknown. Feedback projections preferentially enter superficial and deep anatomical layers, which provides a hypothesis for the cortical depth distribution of fMRI activity related to feedback. Using ultra-high field fMRI, we report a depth distribution of activation in line with feedback during the (illusory) perception of surface motion. Our results fit with a signal re-entering in superficial depths of V1, followed by a feedforward sweep of the re-entered information through V2 and V3. The magnitude and sign of the BOLD response strongly depended on the presence of texture in the background, and was additionally modulated by the presence of illusory motion perception compatible with feedback. In summary, the present study demonstrates the potential of depth-resolved fMRI in tackling biomechanical questions on perception.
人类的视觉表面感知在早期视觉皮层中有神经相关性,但反馈在人类早期视觉皮层中的表面分割中的作用尚不清楚。反馈投射优先进入浅层和深层解剖层,这为与反馈相关的 fMRI 活动的皮层深度分布提供了一个假说。使用超高场 fMRI,我们报告了与(错觉)表面运动感知相关的激活的深度分布。我们的结果与信号重新进入 V1 的浅层深度一致,然后是重新进入的信息通过 V2 和 V3 的前馈扫描。BOLD 反应的幅度和符号强烈依赖于背景中的纹理存在,并且还可以通过与反馈兼容的错觉运动感知来调节。总之,本研究表明,深度分辨 fMRI 在解决感知方面的生物力学问题方面具有潜力。