Maruya Kazushi, Watanabe Hiroki, Watanabe Masataka
Department of Ophthalmology, Jikei University School of Medicine, Nishi-Shinbashi, Japan.
J Vis. 2008 Aug 13;8(11):7.1-11. doi: 10.1167/8.11.7.
After prolonged exposure to moving stimuli, illusory motion is perceived in stimuli that do not contain consistent motion, a phenomenon termed the motion aftereffect (MAE). In this study, we tested MAEs under binocular suppression that renders the motion adaptor invisible for the entire adaptation period. We developed a variant of the continuous flash suppression method to reliably suppress target motion stimuli for durations longer than several tens of seconds. Here, we ask whether motion systems are functional in the absence of perception by measuring the MAE, a question difficult to address using binocular rivalry that accompanies a switch of percept between visible and invisible. Results show that both the MAEs with static and dynamic tests are attenuated with an invisible adaptor when the adaptor and the test stimulus are presented to the same eye. In contrast, when the test pattern was presented to the other eye, the dynamic MAE was observed in invisible adaptor conditions. These results indicate that low-level adaptation survives under total binocular suppression, a finding predicted by previous studies. In contrast, disappearance of interocular transfer in the dynamic MAE suggests that a high-level motion detector does not operate when the motion adaptor is rendered invisible.
在长时间暴露于移动刺激后，在不包含连续运动的刺激中会感知到虚幻运动，这种现象被称为运动后效（MAE）。在本研究中，我们在双眼抑制条件下测试了MAE，在整个适应期内使运动适应刺激不可见。我们开发了一种连续闪光抑制方法的变体，以可靠地抑制目标运动刺激超过几十秒的持续时间。在此，我们通过测量MAE来询问运动系统在没有感知的情况下是否起作用，这是一个使用双眼竞争难以解决的问题，因为双眼竞争伴随着可见和不可见之间的感知切换。结果表明，当适应刺激和测试刺激呈现给同一只眼睛时，无论是静态测试还是动态测试的MAE在适应刺激不可见时都会减弱。相反，当测试图案呈现给另一只眼睛时，在适应刺激不可见的条件下观察到了动态MAE。这些结果表明，低水平适应在完全双眼抑制下仍然存在，这一发现是先前研究预测的。相比之下，动态MAE中双眼间转移的消失表明，当运动适应刺激不可见时，高级运动探测器不起作用。
