SPATIAL-FREQUENCY AND CONTRAST EFFECTS ON PERCEPTS OF BISTABLE STROBOSCOPIC MOTION
SPATIAL-FREQUENCY AND CONTRAST EFFECTS ON PERCEPTS OF BISTABLE STROBOSCOPIC MOTION
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DOI：
10.3758/bf03207486
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发表时间：
1988-12-01
期刊：
影响因子：
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通讯作者：
WILLIAMS, MC
中科院分区：
文献类型：
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作者：
BREITMEYER, BG;MAY, JG;WILLIAMS, MC
在双稳态运动中，我们使用包含垂直正弦曲线栅片的交替坐标系，研究了空间频率和对比度对端到端元素和群运动知觉的影响。实验1表明，对于0.33的固定物理对比度，随着空间频率从1.5周/度(CPD)增加到6.0周/度(CPD)，群体运动报告的百分比跨刺激间间隔(ISIS)呈下降趋势。在实验2中，将1.5-CPD元素的对比度从0.11增加到0.33会增加ISIS中群体运动报告的百分比。在实验3中，我们将1.5和3.0-CPD光栅片的物理对比度设置为主观上与设置为0.33的物理对比度的6.0-CPD光栅片的表观对比度相匹配。有了这种主观上等同的对比，实验1中发现的空间频率依赖趋势要么减弱，要么消除。这些结果(1)暗示了空间频率和对比度相关的模式持续效应对双稳态运动感知的作用，以及(2)在先前研究的背景下，表明这种一般持续效应对双稳态运动感知的贡献独立于运动检测器固有的空间尺度特性。
Using alternating frames containing circular patches of vertical sinusoidla gratings, we investigated the effects of spatial frequency and contrast on the perception of end-to-end element and group motion in bistable motion. Experiment 1 showed that for a fixed physical contrast of .33, the percentage of reports of group motion tended to decrease across interstimulus intervals (ISIs) as spatial frequency increased from 1.5 to 6.0 cycles per degree (cpd). In Experiment 2, increasing the contrast of 1.5-cpd elements from .11 to .33 increased the percentage of group motion reports across ISIs. In Experiment 3, we set the physical contrasts of the 1.5- and 3.0-cpd grating patches to match subjectively the apparent contrast of the 6.0-cpd grating set at a physical contrast of .33. With such subjectively equated contrasts, the spatial frequency-dependent trend found in Experiment 1 was either attenuated or eliminated. These results (1) implicate the role of spatial frequency- and contrast-dependent pattern persistence effects on the perception of bistable motion, and (2) in the context of prior studies, suggest that the contribution of this general persistence effect to the perception of bistable motion is independent of the intrinsic spatial scale properties that characterize motion detectors.