不同亮度条件下人眼对比敏感度函数形状研究
Fang Hou; Yukai Zhao; Luis A. Lesmes; Zhong-Lin Lu
2016
会议名称2016年第一届北京视觉科学会议
会议日期2016-07
会议地点北京
会议主办者中国科学院心理研究所
其他摘要

PURPOSE: The contrast sensitivity function (CSF) provides a comprehensive assessment of spatial vision in both normal and clinical populations. The shape of the CSF provides important information about the modulation transfer function and internal noise of the visual system (Chen et al., 2014; Hou, Lu, & Huang, 2014). Several visual diseases have been shown to differentially affect CSFs under different light conditions. In this study, we tested two hypotheses: (1) the shape of the CSF is invariant for each individual observer across different light conditions, and (2) the shape of the CSF is invariant across all the individuals.
METHOD: CSFs of 112 college students with normal or corrected-to-normal vision were measured using the quick CSF procedure (Lesmes, et al, 2010) in three light conditions (2.65, 20.2 and 95.4 cd/m2). The detailed experimental procedure is described in Hou et al, 2016. CSF is modeled by a truncated log parabola with four parameters: peak gain, peak frequency, bandwidth, and truncation level (Watson & Ahumada, 2005).
RESULT: To test hypothesis 1, we fit a model lattice to each observer’s data using a maximum likelihood procedure. We found that the model holding CSF shape parameters (bandwidth, truncation level) invariant across light conditions, but freely varied peak gain and peak spatial frequency across conditions, provided statistically equivalent fits as the most saturated model for 89.3% of the observers.To test hypothesis 2, we fit the aggregate data with a CSF model that held CSF shape invariant across all observers. This model, with 2 × 3× 112 + 2 parameters, is statically inferior to a model that allowed the shape parameters to vary across observers (with (2 × 3 + 2) × 112 parameters).
CONCLUSION: The results suggest that the shape of the CSF is invariant under different light conditions, but not invariant across observers.

关键词Spatial Vision Contrast sensitivity Model comparison Bayesian adaptive test quick CSF
学科领域感知觉心理学
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语种英语
文献类型会议论文
条目标识符http://ir.psych.ac.cn/handle/311026/20821
专题心理所主办学术会议_2016年第一届北京视觉科学会议_会议摘要
作者单位1.School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
2.Laboratory of Brain Processes (LOBES), Departments of Psychology, The Ohio State University, Columbus, OH 43210, US
3.Adaptive Sensory Technology, Inc, Boston, MA 02114, US
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Fang Hou,Yukai Zhao,Luis A. Lesmes,等. 不同亮度条件下人眼对比敏感度函数形状研究[C]. 见:2016年第一届北京视觉科学会议. 北京. 2016-07.http://vision.csp.escience.cn/dct/page/1.
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