SACCADIC SUPPRESSION RELIES ON LUMINANCE INFORMATION
SACCADIC SUPPRESSION RELIES ON LUMINANCE INFORMATION
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DOI：
10.1007/bf00419631
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发表时间：
1995-12-01
影响因子：
2.3
通讯作者：
MACKNIK, SL
中科院分区：
文献类型：
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作者：
BRIDGEMAN, B;MACKNIK, SL
为了确定跳眼图像位移抑制是否使用来自亮度通道的信息，我们在跳眼期间测量了等距和非等距目标的空间位移检测阈值。我们通过测定跳眼阈值与固定阈值的比值，将这些跳眼阈值与固定阈值测量的位移阈值进行比较。等光条件下的比值低于非等光条件下的比值。这一惊人的结果表明，与注视时的检测能力相比，扫视时等距目标位移的检测优于非等距目标的检测。因此，对于非等距目标，跳眼抑制图像位移（跳眼期间位移阈值高于注视阈值）更为有效。在非等光条件下，由于目标闪烁，位移阈值具有各向异性；与之前的结果一致，当目标和眼睛朝同一方向移动时，阈值要大于它们朝相反方向移动时。这两种效应（闪烁引起的各向异性和非等亮度下更大的抑制）在眼睛向位移方向移动时抵消，产生相等的阈值，当眼睛和目标向同一方向移动时求和，产生较大的阈值差异。我们得出结论，跳眼抑制图像位移使用敏感的亮度对比机制。
To determine whether saccadic suppression of image displacement uses information from luminance channels, we measured spatial displacement detection thresholds with equiluminant and nonequiluminant targets during saccades. We compared these saccadic thresholds with displacement thresholds measured during fixation by making ratios of saccadic thresholds to fixation thresholds. Ratios were lower in the equiluminant condition than in the nonequiluminant. This surprising result indicates that detection of equiluminant target displacements during saccades was better than detection of nonequiluminant targets, compared with the detection abilities during fixation. Thus, saccadic suppression of image displacement, which should increase displacement thresholds during saccades over fixation thresholds, was more effective with nonequiluminant targets. Because of target flicker, displacement thresholds were anisotropic in the nonequiluminant condition; thresholds were greater when target and eye moved in the same direction than when they moved in opposite directions, consistent with earlier results. These two effects (flicker-induced anisotropy and greater suppression in nonequiluminance) canceled when the eye moved opposite the displacement, yielding equal thresholds, and summed when eye and target moved in the same direction, yielding large threshold differences. We conclude that saccadic suppression of image displacement uses mechanisms sensitive to luminance contrast.