Iivanainen A, Rovamo J
Department of Physiology, University of Helsinki, Finland.
Vision Res. 1995 Mar;35(5):589-90. doi: 10.1016/0042-6989(94)00154-e.
We measured thresholds for the perception of blue under chromatic adaptation to white, green, yellow or red at the eccentricities of 0-70 deg in the temporal visual field of four subjects. We used a series of stimulus sizes at each eccentricity, without a prior assumption of any peripheral size-scaling factor. The CIE 1976 UCS (u',v') chromaticity coordinates corresponding to blue perception were subtracted from the chromaticity coordinates of the adaptation field in order to obtain the threshold differences (du',dv') in chromaticity coordinates. Spatial scaling factors for the perception of blue were obtained by non-linear regression (E2 + 5 deg) refers to the eccentricity at which stimulus diameter had to be doubled in order to maintain performance found at the eccentricity of 2.5 deg. E2 for the perception of blue tint varied from 1.2 to 36 deg depending on the state of chromatic adaptation and subject. For the perception of blue tint in yellow three subjects and for the perception of blue tint in red one subject had no spatial scaling factor that would make performance independent of eccentricity. Thus, spatial scaling does not always work.
我们测量了四名受试者颞侧视野中0至70度偏心度下，在白色、绿色、黄色或红色的色适应条件下对蓝色的感知阈值。在每个偏心度下，我们使用了一系列刺激大小，而没有预先假定任何周边大小缩放因子。为了获得色度坐标中的阈值差异（du'，dv'），将与蓝色感知相对应的CIE 1976 UCS（u'，v'）色度坐标从适应场的色度坐标中减去。通过非线性回归获得蓝色感知的空间缩放因子（E2 + 5度）指的是为了保持在2.5度偏心度下的表现，刺激直径必须加倍时的偏心度。蓝色色调感知的E2根据色适应状态和受试者的不同，在1.2至36度之间变化。对于三名受试者对黄色中蓝色色调的感知以及一名受试者对红色中蓝色色调的感知，没有能使表现与偏心度无关的空间缩放因子。因此，空间缩放并不总是有效。
