Polat U, Sagi D
Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.
Vision Res. 1993 May;33(7):993-9. doi: 10.1016/0042-6989(93)90081-7.
We measured contrast detection thresholds for a foveal Gabor signal flanked by two high contrast Gabor signals. The spatially localized target and masks enabled investigation of space dependent lateral interactions between foveal and neighboring spatial channels. Our data show a suppressive region extending to a radius of two wavelengths, in which the presence of the masking signals have the effect of increasing target threshold. Beyond this range a much larger facilitatory region (up to a distance of ten wavelengths) is indicated, in which contrast thresholds were found to decrease by up to a factor of two. The interactions between the foveal target and the flanking Gabor signals are spatial-frequency and orientation specific in both regions, but less specific in the suppression region.
我们测量了位于两个高对比度伽柏信号之间的中央凹伽柏信号的对比度检测阈值。空间局部化的目标和掩蔽物能够研究中央凹与相邻空间通道之间依赖空间的横向相互作用。我们的数据显示，一个抑制区域延伸到两个波长的半径，在该区域中，掩蔽信号的存在会提高目标阈值。在这个范围之外，显示出一个大得多的促进区域（距离可达十个波长），在该区域中，对比度阈值降低了多达两倍。中央凹目标与侧翼伽柏信号之间的相互作用在两个区域中都是空间频率和方向特异性的，但在抑制区域中特异性较低。
