Zhang Jiahua, Kong Weijia, Yang Zhongle
Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
J Huazhong Univ Sci Technolog Med Sci. 2010 Dec;30(6):786-91. doi: 10.1007/s11596-010-0659-2. Epub 2010 Dec 22.
Dynamic color is an important carrier that takes information in some special occupations. However, up to the present, there are no available and objective tests to evaluate dynamic color processing. To investigate the characteristics of dynamic color processing, we adopted two patterns of visual stimulus called "onset-offset" which reflected static color stimuli and "sustained moving" without abrupt mode which reflected dynamic color stimuli to evoke event-related brain potentials (ERPs) in primary color amblyopia patients (abnormal group) and subjects with normal color recognition ability (normal group). ERPs were recorded by Neuroscan system. The results showed that in the normal group, ERPs in response to the dynamic red stimulus showed frontal positive amplitudes with a latency of about 180 ms, a negative peak at about 240 ms and a peak latency of the late positive potential (LPP) in a time window between 290 and 580 ms. In the abnormal group, ERPs in response to the dynamic red stimulus were fully lost and characterized by vanished amplitudes between 0 and 800 ms. No significant difference was noted in ERPs in response to the dynamic green and blue stimulus between the two groups (P>0.05). ERPs of the two groups in response to the static red, green and blue stimulus were not much different, showing a transient negative peak at about 170 ms and a peak latency of LPP in a time window between 350 and 650 ms. Our results first revealed that some subjects who were not identified as color blindness under static color recognition could not completely apperceive a sort of dynamic red stimulus by ERPs, which was called "dynamic red blindness". Furthermore, these results also indicated that low-frequency ERPs induced by "sustained moving" may be a good and new method to test dynamic color perception competence.
动态颜色是某些特殊职业中信息传递的重要载体。然而，迄今为止，尚无可用的客观测试来评估动态颜色处理能力。为了研究动态颜色处理的特征，我们采用了两种视觉刺激模式，即反映静态颜色刺激的“起始-偏移”模式和无突变模式的“持续运动”模式，后者反映动态颜色刺激，以诱发原发性色盲患者（异常组）和颜色识别能力正常的受试者（正常组）的事件相关脑电位（ERP）。通过Neuroscan系统记录ERP。结果显示，在正常组中，对动态红色刺激的ERP在约180 ms潜伏期出现额叶正波幅，约240 ms出现负峰，在290至580 ms的时间窗口内出现晚期正电位（LPP）的峰潜伏期。在异常组中，对动态红色刺激的ERP完全消失，其特征是在0至800 ms之间波幅消失。两组对动态绿色和蓝色刺激的ERP无显著差异（P>0.05）。两组对静态红色、绿色和蓝色刺激的ERP差异不大，在约170 ms出现短暂负峰，在350至650 ms的时间窗口内出现LPP的峰潜伏期。我们的结果首次揭示，一些在静态颜色识别下未被认定为色盲的受试者，通过ERP无法完全感知一种动态红色刺激，这被称为“动态红色盲”。此外，这些结果还表明，由“持续运动”诱发的低频ERP可能是一种测试动态颜色感知能力的良好新方法。
