Danilova M V, Bondarko V M
I. P. Pavlov Institute of Physiology, Russian Acad. Sci., 199034, St. Petersburg, Nab. Makarova, 6, Russia.
Ross Fiziol Zh Im I M Sechenova. 2003 Oct;89(10):1184-96.
We measured contrast detection thresholds for thin black vertical bars (1 min of arc wide, 1 deg long) against a bright background, which were presented eccentrically at 4 deg to the left or right of fixation and flanked on one side by a subthreshold bar having the same dimensions. On each presentation, the stimulus randomly appeared in the left or right visual hemifield. The separation between the test and the flanks varied from 1 to 60-120 min of arc. Different subjects showed better performance in different hemifields. This preference was lost or changed to opposite in the course of training. The central excitatory areas are more or less symmetrical, but inhibitory areas reveal asymmetrical tendency: when flanked bars were more peripheral than the test line, the inhibitory areas were larger. Our results show absence of hemispheric specificity in the line detection task. We discuss the ways of stimulus description in fovea and periphery.
我们测量了细黑色垂直条（宽1角分、长1度）在明亮背景下的对比度检测阈值，这些垂直条偏心呈现于注视点左侧或右侧4度处，且一侧由具有相同尺寸的阈下条带侧翼。每次呈现时，刺激随机出现在左或右半视野。测试条与侧翼条之间的间距在1至60 - 120角分之间变化。不同受试者在不同半视野表现出更好的性能。这种偏好在训练过程中丧失或转变为相反情况。中央兴奋区域或多或少是对称的，但抑制区域显示出不对称趋势：当侧翼条比测试线更靠外周时，抑制区域更大。我们的结果表明在线条检测任务中不存在半球特异性。我们讨论了中央凹和外周刺激描述的方式。
