Class: QuestHandler

QuestHandler(options)

new QuestHandler(options)

A Trial Handler that implements the Quest algorithm for quick measurement of psychophysical thresholds. QuestHandler relies on the jsQuest library, a port of Prof Dennis Pelli's QUEST algorithm by Daiichiro Kuroki.

Parameters:
Name Type Description
options Object the handler options
Properties
Name Type Attributes Default Description
psychoJS module:core.PsychoJS the PsychoJS instance
varName string the name of the variable / intensity / contrast / threshold manipulated by QUEST
startVal number initial guess for the threshold
startValSd number standard deviation of the initial guess
minVal number minimum value for the threshold
maxVal number maximum value for the threshold
pThreshold number <optional>
 0.82 threshold criterion expressed as probability of getting a correct response
nTrials number maximum number of trials
stopInterval number minimum [5%, 95%] confidence interval required for the loop to stop
method module:data.QuestHandler.Method the QUEST method
beta number <optional>
 3.5 steepness of the QUEST psychometric function
delta number <optional>
 0.01 fraction of trials with blind responses
gamma number <optional>
 0.5 fraction of trails that would generate a correct response when the threshold is infinitely small
grain number <optional>
 0.01 quantization of the internal table
name string name of the handler
autoLog boolean <optional>
 false whether or not to log
Source:

Extends

  • TrialHandler