QUEST+ (Watson, 2017) is an extension of QUEST (Watson & Pelli, 1983) that can deal with multiple stimulus parameters, multiple psychometric parameters, and more than two responses options. The jsQuestPlus JavaScript library allows researchers to use the QUEST+ method in online experiments.
We prefer to cite the paper, but either citation is acceptable.
Kuroki, D., & Pronk, T. (2022). jsQuestPlus: A JavaScript implementation of the QUEST+ method for estimating psychometric function parameters in online experiments. Behavior Research Methods. https://doi.org/10.3758/s13428-022-01948-8
Kuroki, D., & Pronk, T. (2022). jsQuestPlus: A JavaScript library to use the QUEST+ method in online experiments. (Version 2.0.0) [Computer software]. https://github.com/kurokida/jsQuestPlus
See the GitHub page and Customization of Psychometric function
The demos folder contains some sample code.
This is the sample code for Watson's first example: "Estimation of contrast threshold {1, 1, 2}". The threshold is estimated using the stimulus parameter (contrast) and responses described in Watson's paper.
This file is the same as Example_1stim_1psy_2resp_Watson(2017).html, except that it simulates the observer's response. The final estimate will change slightly each time you run the program.
This is the sample code for Watson's forth example: "Contrast sensitivity function {2, 3, 2}". The psychometric parameters are estimated using the stimulus parameters and responses described in Watson's paper.
This file is the same as Example_2stim_3psy_2resp_Watson(2017).html, except that it simulates the observer's response. The final estimates will change slightly each time you run the program.
This is the sample code for jsPsych users. This simulates Watson's second example: "Estimation of contrast threshold, slope, and lapse {1, 3, 2}".
- The numeric.js library developed by Sébastien Loisel under the MIT licence performs matrix/array calculations at high speeds. This library is included in jsQuestPlus, with some of its functions available by prefixing them with
jsQuestPlus.:abs, add, cos, dim, div, dot, exp, floor, isFinite, isNaN, linspace, log, mod, mul, pow, round, sin, sqrt, sub, sum, transpose.
Install node, then clone the repo to your hard drive. Next, you can install jsQuestPlus and its dependencies by running:
npm install
To package jsQuestPlus and it's dependencies, and export those as UMD bundle, run the command below. Your bundle will be available in the dist/ directory:
npx rollup -c
jsQuestPlus depends on a [fork of the numeric library]((https://github.com/tpronk/numeric), which turns this library into an ES6 module.