A bias-free measure of the face viewpoint aftereffect from radial frequency patterns
A bias-free measure of the face viewpoint aftereffect from radial frequency patterns
复制标题
基于径向频率模式的人脸视点后效应的无偏差测量
DOI：
10.1167/15.12.1194
复制
发表时间：
2015
影响因子：
1.8
通讯作者：
Keefe B
中科院分区：
文献类型：
--
作者：
Keefe B
面孔视点后效(FVA)是一种错觉，它使正面面对测试面孔的知觉偏离适应面孔的相反方向(Fang&He，2005)。突出面部视点这些变化的头部外轮廓的变化可以使用径向频率(RF)模式来建模(Wilson等人，2000)。我们使用射频模式和最近开发的程序来梳理FVA与观察者的反应偏差。我们使用的心理物理程序是必要的，因为测量知觉错觉的传统方法混淆了知觉变化和观察者标准的变化(Morgan，2013；2014)。描述形状刺激的轮廓具有跟随高斯四阶导数的亮度分布。参与者适应了两个垂直排列、对比度反转(1赫兹)的刺激，这些刺激面向相反的方向。八个不同的测试条件被随机交错，每个条件都有两个静态测试刺激，垂直对齐到适配器的相同空间位置。测试刺激可以面对相同或相反的方向，并允许我们做出具体的预测，以区分适应和反应偏差。采用两个交替的强迫选择自适应阶梯程序，参与者指出两个测试刺激中哪一个看起来最不对称。结果显示，来自RF模式的大量FVA不能归因于观察者反应偏向的变化。通过改变测试刺激的大小，我们能够排除纯粹的视网膜适应的描述。将测试刺激的大小减半会使FVA减少约50%，这表明存在条纹外适应轨迹。这些结果与Wilson等人(2000)的建议是一致的，该建议提出了一个用于处理来自RF模式的人脸视点的纹外轨迹。
The face viewpoint aftereffect (FVA) is an illusion that biases the perception of a frontward facing test face in the opposite direction to the adapting face (Fang & He, 2005). Changes in the outer contour of the head that highlight these changes in face viewpoint can be modelled using radial frequency (RF) patterns (Wilson et al., 2000). We used RF patterns together with a recently developed procedure to tease apart the FVA from observer response bias. The psychophysical procedure we used was necessary because traditional methods for measuring perceptual illusions confound perceptual changes, with changes in an observer’s criterion (Morgan, 2013; 2014). The contours describing the shape stimuli had a luminance profile that followed the fourth derivative of a Gaussian. Participants adapted to two vertically aligned, contrast reversing (1Hz) stimuli facing in opposite directions. Eight separate test conditions were randomly interleaved, each with two static test stimuli, vertically aligned to the same spatial position of the adaptors. Test stimuli could face in either the same or opposite directions and allowed us to make tangible predictions to distinguish adaptation from response bias. A two-alternate forced choice adaptive staircase procedure was used in which the participants indicated which of the two test stimuli appeared most asymmetric. Results showed a large FVA from RF patterns that could not be attributed to shifts in observer response bias. By varying the size of the test stimuli we were able to rule out a purely retinotopic account of adaptation. Halving the size of the test stimuli reduced the FVA by~ 50%, suggesting an extra-striate locus of adaptation. These results are consistent with the proposal by Wilson et al.,(2000) which suggests an extra-striate locus for the processing of face viewpoint from RF patterns.