Kelly J P, Chang S
Department of Ophthalmology, Children's Hospital and Regional Medical Center, CH-61, 4800 Sand Point Way, Seattle, WA 98105-0371, USA.
Vision Res. 2000;40(14):1887-905. doi: 10.1016/s0042-6989(00)00049-3.
This study measured the development of contrast-sweep VEP thresholds to a range of chromatic and luminance stimuli. Subjects were 14-32 week-old infants (n=21) and three adults. Stimuli were 1 c/d sine gratings reversed at 5.6 Hz. Chromaticity was varied from the L-M axis to an achromatic axis. VEP thresholds when plotted in L- and M-cone contrasts showed that: (1) VEP thresholds did not consistently locate the psychophysical isoluminance match under the same stimulus conditions; (2) About 50% of the data were described by independent chromatic and luminance mechanism, however, thresholds were limited by the cone contrast of the stimulus, phase cancellation between visual mechanisms, and the proper sampling of thresholds in L- and M-cone contrast space and; (3) No significant changes occurred in VEP detection contours across ages but suprathreshold VEP amplitudes suggested complex developmental changes. Data from previous studies showed similar results.
本研究测量了一系列色度和亮度刺激下对比度扫描视觉诱发电位（VEP）阈值的发展情况。受试者为14至32周大的婴儿（n = 21）和三名成年人。刺激物为在5.6 Hz频率下反转的1 c/d正弦光栅。色度从L - M轴变化到无彩色轴。当以L - 锥和M - 锥对比度绘制VEP阈值时发现：（1）在相同刺激条件下，VEP阈值并非始终能确定心理物理学等亮度匹配；（2）约50%的数据可由独立的色度和亮度机制来描述，然而，阈值受到刺激的锥对比度、视觉机制之间的相位抵消以及L - 锥和M - 锥对比度空间中阈值的适当采样的限制；（3）不同年龄组的VEP检测轮廓没有显著变化，但阈上VEP振幅表明存在复杂的发育变化。先前研究的数据也显示了类似的结果。
