BOLD fMRI and psychophysical measurements of contrast response to broadband images

Cheryl A. Olman; Kamil Ugurbil; Paul Schrater; Daniel Kersten

doi:10.1016/j.visres.2003.10.022

BOLD fMRI and psychophysical measurements of contrast response to broadband images

Cheryl A. Olman, Kamil Ugurbil, Paul Schrater, Daniel Kersten

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66 Scopus citations

Abstract

We have measured the relationship between image contrast, perceived contrast, and BOLD fMRI activity in human early visual areas, for natural, whitened, pink noise, and white noise images. As root-mean-square contrast increases, BOLD response to natural images is stronger and saturates more rapidly than response to the whitened images. Perceived contrast and BOLD fMRI responses are higher for pink noise than for white noise patterns, by the same ratio as between natural and whitened images. Spatial phase structure has no measurable effect on perceived contrast or BOLD fMRI response. The fMRI and perceived contrast response results can be described by models of spatial frequency response in V1, that match the contrast sensitivity function at low contrasts, and have more uniform spatial frequency response at high contrasts.

Original language	English (US)
Pages (from-to)	669-683
Number of pages	15
Journal	Vision Research
Volume	44
Issue number	7
DOIs	https://doi.org/10.1016/j.visres.2003.10.022
State	Published - Mar 2004

Bibliographical note

Funding Information:
The authors would like to thank Essa Yacoub for his assistance in fMRI data collection, and the two reviewers for their suggestions for improving the manuscript. Work on this project was funded by NIH RO1 EY02587, NSF/IGERT DGE 9870633, BTRR P41-RR008079, the Keck Foundation, and the MIND Institute.

Keywords

Functional brain imaging
Models and theory
Natural images
Psychophysics
Spatial vision

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title = "BOLD fMRI and psychophysical measurements of contrast response to broadband images",

abstract = "We have measured the relationship between image contrast, perceived contrast, and BOLD fMRI activity in human early visual areas, for natural, whitened, pink noise, and white noise images. As root-mean-square contrast increases, BOLD response to natural images is stronger and saturates more rapidly than response to the whitened images. Perceived contrast and BOLD fMRI responses are higher for pink noise than for white noise patterns, by the same ratio as between natural and whitened images. Spatial phase structure has no measurable effect on perceived contrast or BOLD fMRI response. The fMRI and perceived contrast response results can be described by models of spatial frequency response in V1, that match the contrast sensitivity function at low contrasts, and have more uniform spatial frequency response at high contrasts.",

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AU - Ugurbil, Kamil

AU - Schrater, Paul

AU - Kersten, Daniel

N1 - Funding Information: The authors would like to thank Essa Yacoub for his assistance in fMRI data collection, and the two reviewers for their suggestions for improving the manuscript. Work on this project was funded by NIH RO1 EY02587, NSF/IGERT DGE 9870633, BTRR P41-RR008079, the Keck Foundation, and the MIND Institute.

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AB - We have measured the relationship between image contrast, perceived contrast, and BOLD fMRI activity in human early visual areas, for natural, whitened, pink noise, and white noise images. As root-mean-square contrast increases, BOLD response to natural images is stronger and saturates more rapidly than response to the whitened images. Perceived contrast and BOLD fMRI responses are higher for pink noise than for white noise patterns, by the same ratio as between natural and whitened images. Spatial phase structure has no measurable effect on perceived contrast or BOLD fMRI response. The fMRI and perceived contrast response results can be described by models of spatial frequency response in V1, that match the contrast sensitivity function at low contrasts, and have more uniform spatial frequency response at high contrasts.

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KW - Models and theory

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KW - Psychophysics

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BOLD fMRI and psychophysical measurements of contrast response to broadband images

Abstract

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Keywords

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