Department of Psychology, School of Social Sciences, Tsinghua University, Beijing, 100084, China.
THU-IDG/McGovern Institute for Brain Research, Beijing, 100084, China.
Exp Brain Res. 2020 Nov;238(11):2581-2588. doi: 10.1007/s00221-020-05918-4. Epub 2020 Sep 4.
Binocular disparity, a primary cue for stereoscopic depth perception, is widely represented in visual cortex. However, the functional specialization in the disparity processing network remains unclear. Using magnetic resonance imaging-guided transcranial magnetic stimulation, we studied the causal contributions of V3A and MT+ to stereoscopic depth perception. Subjects viewed random-dot stereograms forming transparent planes with various interplane disparities. Their smallest detectable disparity and largest detectable disparity were measured in two experiments. We found that the smallest detectable disparity was affected by V3A, but not MT+ , stimulation. On the other hand, the largest detectable disparity was affected by both V3A and MT+ stimulation. Our results suggest different roles of V3A and MT+ in stereoscopic depth processing.
双眼视差是立体深度感知的主要线索，在视觉皮层中广泛存在。然而，视差处理网络的功能特化仍不清楚。我们使用磁共振成像引导经颅磁刺激技术，研究了 V3A 和 MT+ 对立体深度感知的因果贡献。被试观看形成各种层间视差的透明平面的随机点立体图。在两个实验中测量了他们的最小可检测视差和最大可检测视差。我们发现，最小可检测视差受 V3A 刺激影响，但不受 MT+ 刺激影响。另一方面，最大可检测视差受 V3A 和 MT+ 刺激的影响。我们的结果表明 V3A 和 MT+ 在立体深度处理中具有不同的作用。
