Obtaining QUEST threshold

Builder
1

If this template helps then use it. If not then just delete and start from scratch.

OS
PsychoPy version (e.g. 2022.3)
**Standard Standalone? YES
What are you trying to achieve?:

Trying to obtain the threshold using the QUEST in the builder

What did you try to make it work?:

I followed the documentation and checked the posts in Psychopy discourse

What specifically went wrong when you tried that?:
The QUEST staircase is working but when I try to get the threshold by using
mean= quest_st.mean()
print (mean)

it gives the following error: “AttributeError: ‘MultiStairHandler’ object has no attribute ‘mean’”. Here I attached the psexp files with a toy version of the procedure with 10 trials, any help would be much appreciated!

best,
david
quest_pars.csv (154 Bytes)
standardQuest_grating.psyexp (36.8 KB)

2

Hi @d.soto.b,

To access the threshold estimates, you can use the variable level as you are already doing to set the contrast of your gabor. Then typically, the final estimate settled on by the staircase is used as the threshold.

Thanks so much,

Kim