Zenger B, Sagi D
Vision Res. 1996 Aug;36(16):2497-513. doi: 10.1016/0042-6989(95)00303-7.
Interactions between filters tuned to different orientations and spatial locations were investigated with a masking paradigm. Targets were masked by pairs of Gabor signals presented either at a different orientation (+/- delta theta) or at a different spatial location (+/- delta y). The two mask components were either of equal phase or of opposite phase to each other. Detection thresholds of the target were measured as a function of mask contrast. Typically, the curves obtained showed the following behavior: for increasing mask contrast the threshold first decreased, then reached a minimum and then increased linearly on a log-log scale reflecting a power-law behavior. Mask pairs of equal phase as well as pairs of opposite phase were shown to facilitate detection. Facilitation by mask pairs of equal phase was larger (up to 0.4 log units) and decreased for increasing delta theta and delta y. The facilitation for mask pairs of opposite phase (approximately 0.1 log units) was observed only for larger delta theta and delta y. Phase independent suppression was observed with higher mask contrasts at smaller delta theta and delta y. The strength of this suppression was shown to decrease with practice. We account for the observed facilitation with an accelerating transducer function applied on a second-stage filter. Suppression is modeled with an additional inhibitory second stage filter that divides the output of this transducer. Selective reduction of the inhibitory gain accounts for the practice effects.
利用掩蔽范式研究了调谐到不同方向和空间位置的滤波器之间的相互作用。目标被呈现为不同方向（±Δθ）或不同空间位置（±Δy）的一对Gabor信号所掩蔽。两个掩蔽成分彼此要么同相要么反相。测量目标的检测阈值作为掩蔽对比度的函数。通常，得到的曲线呈现以下行为：随着掩蔽对比度增加，阈值首先降低，然后达到最小值，然后在反映幂律行为的对数-对数尺度上线性增加。同相掩蔽对以及反相掩蔽对均被证明有助于检测。同相掩蔽对的促进作用更大（高达0.4对数单位），并且随着Δθ和Δy增加而减小。仅在较大的Δθ和Δy时观察到反相掩蔽对的促进作用（约0.1对数单位）。在较小的Δθ和Δy时，在较高的掩蔽对比度下观察到与相位无关的抑制作用。这种抑制作用的强度随着练习而降低。我们用应用于第二阶段滤波器的加速换能器函数来解释观察到的促进作用。用一个额外的抑制性第二阶段滤波器对抑制作用进行建模，该滤波器对该换能器的输出进行除法运算。抑制增益的选择性降低解释了练习效应。
