QUEST+

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.

How to cite

We prefer to cite the paper, but either citation is acceptable.

Paper citation

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

Software citation (for version 2.0.0)

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

How to use

See the GitHub page and Customization of Psychometric function

Demonstrations

The demos folder contains some sample code.

Example_1stim_1psy_2resp_Watson(2017).html

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.

• Run this example.
• See the source code.

Simulation_1stim_1psy_2resp_Watson(2017).html

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.

• Run this example.
• See the source code.

Example_2stim_3psy_2resp_Watson(2017).html

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.

• Run this example.
• See the source code.

Simulation_2stim_3psy_2resp_Watson(2017).html

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.

• Run this example.
• See the source code.

jsPsychDemo/jsQuestPlus_jsPsychDemo.html

This is the sample code for jsPsych users. This simulates Watson's second example: "Estimation of contrast threshold, slope, and lapse {1, 3, 2}".

• Run this example.
• See the source code.

Convenience functions

• 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.

Information for developers

Installation

Install node, then clone the repo to your hard drive. Next, you can install jsQuestPlus and its dependencies by running:

npm install

Building jsQuestPlus

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

Notes

jsQuestPlus depends on a fork of the numeric library, which turns this library into an ES6 module.