Discrimination of amplitude spectrum slope in the fovea and parafovea and the local amplitude distributions of natural scene imagery
Discrimination of amplitude spectrum slope in the fovea and parafovea and the local amplitude distributions of natural scene imagery
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DOI：
10.1167/6.7.3
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发表时间：
2006-01-01
影响因子：
1.8
通讯作者：
Hess, Robert F.
中科院分区：
文献类型：
--
作者：
Hansen, Bruce C.;Hess, Robert F.
许多研究已经调查了人类的视觉表现是否与自然场景的幅度谱(即1/f(α))的一般形式有关。这里，有人争辩说，这些研究中的一些数据存在差异，对这些差异的一个可能的解释可能与方法上的差异有关(例如，提供给中心凹的刺激而不是旁中央凹的刺激)。我们试图用两种心理物理范式来解决一些差异，这两种范式涉及用视觉噪声和呈现给中央凹或副中央凹的自然场景图像斑块进行阿尔法辨别。对于具有alpha值的刺激，中心凹-旁凹阈值差异明显
A number of studies have investigated whether human visual performance can be related to the general form of the amplitude spectra (i.e., 1/f(alpha)) of natural scenes. Here, it is argued that there are some discrepancies in the data between some of those studies and that one possible explanation for the discrepancies may be related to differences in methodology ( e. g., stimuli presented to the fovea as opposed to the parafovea). We sought to resolve some of the discrepancies with two psychophysical paradigms involving alpha discrimination with visual noise and natural scene image patches presented to the fovea or parafovea. Fovea - parafovea threshold differences were apparent for stimuli possessing alpha values