Please wait a minute...
Advances in Psychological Science    2016, Vol. 24 Issue (Suppl.) : 37-     DOI:
|
The Shape of the Contrast Sensitivity Function: Invariant across Light Conditions, Varies Across Observers
Fang Hou; Yukai Zhao; Luis A. Lesmes; Zhong-Lin Lu
School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
Laboratory of Brain Processes (LOBES), Departments of Psychology, The Ohio State University, Columbus, OH 43210, US
Adaptive Sensory Technology, Inc, Boston, MA 02114, US
Download: PDF(0 KB)  
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks    
Abstract  

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.

Keywords Spatial Vision      Contrast sensitivity      Model comparison      Bayesian adaptive test      quick CSF     
Issue Date: 31 December 2016
Service
E-mail this article
E-mail Alert
RSS
Articles by authors
Fang Hou
Yukai Zhao
Luis A. Lesmes
Zhong-Lin Lu
Cite this article:   
Fang Hou,Yukai Zhao,Luis A. Lesmes, et al. The Shape of the Contrast Sensitivity Function: Invariant across Light Conditions, Varies Across Observers[J]. Advances in Psychological Science, 2016, 24(Suppl.): 37-.
URL:  
http://journal.psych.ac.cn/xlkxjz/EN/     OR     http://journal.psych.ac.cn/xlkxjz/EN/Y2016/V24/ISuppl./37
[1] Yiliang Lu; Hongliang Gong; Jiapeng Yin; Zheyuan Chen; Ian M. Andolina; Wei Wang. Spatial frequency selectivity in Macaque V1, V2 and V4 revealed by intrinsic optical imaging[J]. Advances in Psychological Science, 2016, 24(Suppl.): 58-.
[2] Yijun Ge; Lan Wang; Sheng He. Perceived illusory orientation from the flash grab effect induces the Tilt Aftereffect[J]. Advances in Psychological Science, 2016, 24(Suppl.): 22-.
[3] Ge Chen; Lejin Wang; Fang Hou; Zhong-Lin Lu; Chang-Bing Huang. Perceptual training significantly improves visual functions in children with amblyopia[J]. Advances in Psychological Science, 2016, 24(Suppl.): 4-4.
[4] Yiliang Lu; Hongliang Gong; Jiapeng Yin; Zheyuan Chen; Ian M. Andolina; Wei Wang. The cortical magnification factor and spatial frequency selectivity in Macaque V1 revealed quantitatively by Intrinsic Optical Imaging[J]. Advances in Psychological Science, 2016, 24(Suppl.): 93-.
[5] Rui Ni; Mikki Phan. [J]. Advances in Psychological Science, 2016, 24(Suppl.): 70-.
[6] LUO Yan-Lin ;Andrew CN CHEN;PENG Dan-Ling. Controversy in Visual Magnocellular Deficit theory Associated with Dyslexia[J]. , 2008, 16(03): 497-503.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
Copyright © Advances in Psychological Science
Support by Beijing Magtech