The pointillism method for creating stimuli suitable for use in computer-based visual contrast sensitivity testing.

The pointillism method for creating stimuli suitable for use in computer-based visual contrast sensitivity testing. Research Abstract Details 

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The pointillism method for creating stimuli suitable for use in computer-based visual contrast sensitivity testing. Abstract Text:

Travis H Turner,

An increasingly large corpus of clinical and experimental neuropsychological research has demonstrated the utility of measuring visual contrast sensitivity. Unfortunately, existing means of measuring contrast sensitivity can be prohibitively expensive, difficult to standardize, or lack reliability. Additionally, most existing tests do not allow full control over important characteristics, such as off-angle rotations, waveform, contrast, and spatial frequency. Ideally, researchers could manipulate characteristics and display stimuli in a computerized task designed to meet experimental needs. Thus far, 256-bit color limitation in standard cathode ray tube (CRT) monitors has been preclusive. To this end, the pointillism method (PM) was developed. Using MATLAB((R)) software, stimuli are created based on both mathematical and stochastic components, such that differences in regional luminance values of the gradient field closely approximate the desired contrast. This paper describes the method and examines its performance in sine and square-wave image sets from a range of contrast values. Results suggest the utility of the method for most experimental applications. Weaknesses in the current version, the need for validation and reliability studies, and considerations regarding applications are discussed. Syntax for the program is provided in an appendix, and a version of the program independent of MATLAB((R)) is available from the author.

The pointillism method for creating stimuli suitable for use in computer-based visual contrast sensitivity testing. Publishing Authors By Initials

TH Turner,

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The pointillism method for creating stimuli suitable for use in computer-based visual contrast sensitivity testing. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of neuroscience methods

VOLUME: 142

Page Numbers: 219-29

Journal Abbreviation: J. Neurosci. Methods

ISSN: 0165-0270

DAY: 30

MONTH: Mar

YEAR: 2005

The pointillism method for creating stimuli suitable for use in computer-based visual contrast sensitivity testing. Information

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LANGUAGE: eng

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Grant and Affiliation Information for The pointillism method for creating stimuli suitable for use in computer-based visual contrast sensitivity testing.

AFFILIATION: Joint Doctoral Program in Clinical Psychology, San Diego State University and the University of California, San Diego, CA, USA.

Country: Netherlands

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MEDLINETA: J Neurosci Methods

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