Hess R F, Pointer J S
Physiological Laboratory, University of Cambridge, England.
Vision Res. 1987;27(8):1343-60. doi: 10.1016/0042-6989(87)90211-2.
Human visual sensitivity for discriminating between, on the one hand stimuli composed of components (F) and (F + 3F) (compound detection), and on the other hand (F + 3F) and (F - 3F) (phase discrimination), was measured as a function both of stimulus contrast and eccentricity. Performance under these particular conditions was found to depend upon whether the (F) or (3F) component was dominant in the pattern. When the (F) component was high in contrast, visual performance was well modelled by an edge-blur discrimination, whereas when the (3F) component was high in contrast, visual performance was well modelled by a contrast discrimination involving local spatial features within each waveform. These conclusions were valid for both foveal and peripheral vision. The finding that these suprathreshold compound stimuli are discriminated on the basis of the local spatial features, and not on differences in their phase spectra as previously thought, allows a reinterpretation of the importance of phase coding in normal vision and of the selective loss of these discriminations that have been previously reported for peripheral vision and in amblyopia.
一方面是由成分（F）和（F + 3F）组成的刺激（复合检测），另一方面是（F + 3F）和（F - 3F）（相位辨别）。发现在这些特定条件下的表现取决于（F）或（3F）成分在模式中是否占主导。当（F）成分对比度高时，视觉表现可以通过边缘模糊辨别很好地建模，而当（3F）成分对比度高时，视觉表现可以通过涉及每个波形内局部空间特征的对比度辨别很好地建模。这些结论对中央凹和周边视觉都有效。这些超阈值复合刺激是基于局部空间特征而不是如先前认为的相位谱差异来辨别的这一发现，使得能够重新解释相位编码在正常视觉中的重要性，以及先前报道的周边视觉和弱视中这些辨别能力的选择性丧失。
