MEG signal dynamics of chromatic motion mechanism

在本研究项目中，我利用脑磁图（MEG）研究了色运动在心理物理学和脑功能成像中的机制（脑磁图）系统。在心理学实验中，我测试了二阶半音运动是如何与二阶半音运动相结合的-对非彩色运动进行排序，以阐明运动机制的最终皮层阶段可以处理彩色信息以产生彩色运动信号或整合来自彩色中心，可能是V4，带有无色运动信号。结果表明，在这个心理物理学的最后阶段可以整合二阶彩色和无色运动信号与时间频率域的窄调谐，并产生一个单一的连贯的运动知觉。我还进行了心理学实验，研究了S锥对运动机制的贡献。结果表明，S锥通过两条不同的途径参与运动：一条是通过色度途径的非线性运动机制，另一条是通过亮度途径的线性运动机制。这与常规脑磁图实验的结果一致，本研究项目可以从多个方面揭示色动机制的细节。然而，它并不是半音运动机构的全貌。因此，有必要对后期相关脑磁信号进行分析，以揭示整个色动机制。

In this research project, I investigated chromatic motion mechanism in psychophysics and functional brain imaging with the use of MEG (MagnetoEncephaloGram) system.In the psychological experiments, I tested how second-order chromatic motion was integrated with second-order achromatic motion to clarify that the final cortical stage for motion mechanism can deal with chromatic information to produce chromatic motion signal or integrate chromatic motion signal coming from color center, probably V4, with achromatic motion signal. Results in this psychophysics indicate that the final stage can integrate second-order chromatic and achromatic motion signal with the narrow tuned in temporal frequency domain and produce a single coherent motion perception. I also carried out psychological experiment in which I investigated how S-cones contribute to motion mechanism. The results show that S-cones contribute to motion via two different pathways : a non-linear motion mechanism via a chromatic pathway and a linear motion mechanism via a luminance pathway.Results in MEG shows that the first peak of the signal occurs at 100 msec from onset of the visual stimuli. This is consistent with the results of conventional MEG experiments.This research project could achieve to find the detail of the chromatic motion mechanism in many of aspects. However, it is not the whole figure of the chromatic motion mechanism. It is therefore necessary to analyze MEG signals related on later stage in order to find the whole chromatic motion mechanism.