Intensity scale in QuestHander

Coding
1

The documentation for the QuestHandler staircase says that threshold is measured using a Weibull psychometric function. This psychometric function is a function of " intensity or a contrast (in log10 units)".

In the example given in the documentation the minVal and maxVal parameters, and the output, are used in such a way that suggests they refer directly to contrast, not to contrast in log10 units. E.g. minVal is set to 0, instead of some very large negative number, and the output of the staircase is used directly to set the contrast.

Therefore, I am wondering which, if any, parameters and outputs use intensity/contrast on a log10 scale and which not.

Thanks you very much for any thoughts or advice, and apologies if I have misunderstood something here.

2

Looking at the code, it should all be in the same units as the starting value, and I think they’re all log10 units for QuestHandler. You can use QuestPlusHandler and specify whether they’re log, decibel, or linear if you want to be absolutely sure.