Leonova Anna, Pokorny Joel, Smith Vivianne C
Visual Sciences Center, University of Chicago, 940 East 57th Street, Chicago, IL 60637, USA.
Vision Res. 2003 Sep;43(20):2133-9. doi: 10.1016/s0042-6989(03)00333-x.
The goal of this study was to investigate the role of inferred parvocellular (PC) and magnocellular (MC) pathways in spatial contrast sensitivity. Localized, spatially narrow-band patterns (sixth derivatives of Gaussians, D6s) were presented at various peak spatial frequencies. When the D6 appeared on a pulsed luminance pedestal (Pulsed-Pedestal Paradigm), the spatial contrast sensitivity showed a band-pass shape with good contrast sensitivity at medium spatial frequencies. When the D6 appeared on a steady luminance pedestal (Steady-Pedestal Paradigm), the spatial contrast sensitivity showed a low-pass shape with decreased sensitivity at high spatial frequencies. The band-pass CSF was interpreted as reflecting PC-pathway mediation; the lower spatial frequency region of the low-pass CSF as reflecting MC-pathway mediation.
本研究的目的是探讨推断的小细胞（PC）和大细胞（MC）通路在空间对比敏感度中的作用。在不同的峰值空间频率下呈现局部的、空间窄带图案（高斯函数的六阶导数，D6s）。当D6出现在脉冲亮度基座上（脉冲基座范式）时，空间对比敏感度呈现带通形状，在中等空间频率下具有良好的对比敏感度。当D6出现在稳定亮度基座上（稳定基座范式）时，空间对比敏感度呈现低通形状，在高空间频率下敏感度降低。带通对比敏感度函数（CSF）被解释为反映PC通路的介导作用；低通CSF的较低空间频率区域被解释为反映MC通路的介导作用。
