Njemanze Philip C
Chidicon Medical Center, Owerri, Imo State, Nigeria.
Exp Transl Stroke Med. 2011 Feb 10;3(1):1. doi: 10.1186/2040-7378-3-1.
Simultaneous color contrast and color constancy are memory processes associated with color vision, however, the gender-related differences of 'physiologic color space' remains unknown. Color processing was studied in 16 (8 men and 8 women) right-handed healthy subjects using functional transcranial Doppler (fTCD) technique. Mean flow velocity (MFV) was recorded in both right (RMCA) and left (LMCA) middle cerebral arteries in dark and white light conditions, and during color (blue and yellow) stimulations. The data was plotted in a 3D quadratic curve fit to derive a 'physiologic color space' showing the effects of luminance and chromatic contrasts. In men, wavelength-differencing of opponent pairs (yellow-blue) was adjudged by changes in the RMCA MFV for Yellow plotted on the Y-axis, and the RMCA MFV for Blue plotted on the X-axis. In women, frequency-differencing for opponent pairs (blue-yellow) was adjudged by changes in the LMCA MFV for Yellow plotted on the Y-axis, and the LMCA MFV for Blue plotted on the X-axis. The luminance effect on the LMCA MFV in response to white light with the highest luminous flux, was plotted on the (Z - axis), in both men and women. The 3D-color space for women was a mirror-image of that for men, and showed enhanced color constancy. The exponential function model was applied to the data in men, while the logarithmic function model was applied to the data in women. Color space determination may be useful in the study of color memory, adaptive neuroplasticity, cognitive impairment in stroke and neurodegenerative diseases.
同时颜色对比和颜色恒常性是与颜色视觉相关的记忆过程，然而，“生理颜色空间”的性别差异仍然未知。使用功能性经颅多普勒（fTCD）技术，对16名（8名男性和8名女性）右利手健康受试者的颜色处理进行了研究。在黑暗和白光条件下，以及在颜色（蓝色和黄色）刺激期间，记录右（RMCA）和左（LMCA）大脑中动脉的平均流速（MFV）。数据绘制在三维二次曲线拟合中，以得出显示亮度和颜色对比度影响的“生理颜色空间”。在男性中，通过将绘制在Y轴上的黄色的RMCA MFV变化和绘制在X轴上的蓝色的RMCA MFV变化来判断对立色对（黄-蓝）的波长差异。在女性中，通过将绘制在Y轴上的黄色的LMCA MFV变化和绘制在X轴上的蓝色的LMCA MFV变化来判断对立色对（蓝-黄）的频率差异。在男性和女性中，将对具有最高光通量的白光作出反应时LMCA MFV的亮度效应绘制在（Z轴）上。女性的三维颜色空间是男性的镜像，并显示出增强的颜色恒常性。指数函数模型应用于男性的数据，而对数函数模型应用于女性的数据。颜色空间测定可能在颜色记忆、适应性神经可塑性、中风和神经退行性疾病中的认知障碍研究中有用。
