OS (e.g. Win10): Win10 PsychoPy version (e.g. 1.84.x): v3.0.4 Standard Standalone? (y/n) Yes What are you trying to achieve?: I want to build a 2AFC QUEST staircase that adjusts the gabor contrast to achieve a 75% accuracy threshold for participants.
What did you try to make it work?: I used the “psychophysicsStairsInterleaved” demo and changed the loop stairType to QUEST and changed the .csv file with parameters for QuestHandler.
What specifically went wrong when you tried that?:
Traceback (most recent call last):
File “C:\Users\Quantum\Documents\Projects\staircase\interleaved_SF_contrast_lastrun.py”, line 320, in
loop_trials.addResponse(resp.corr)
File “C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\data\staircase.py”, line 1532, in addResponse
self.currentStaircase.addResponse(result, intensity)
File “C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\data\staircase.py”, line 905, in addResponse
self._checkFinished()
File “C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\data\staircase.py”, line 1045, in _checkFinished
self.confInterval(True) < self.stopInterval):
TypeError: ‘<’ not supported between instances of ‘numpy.ndarray’ and ‘str’
So I was able to get the staircase to run my removing a few parameters. A picture of what parameters worked is attached. However, the contrast does not seem to be adjusting as can be seen in the picture of the .csv file. I also attached pictures of the settings of the gabor I am using.
I’m having the same problem; I’ve an experiment I’m trying to run that consists of 100 dots with directions sampled from a Gaussian distribution- I want the SD of this distribution to increase/decrease as per the staircase. I’ve got the experiment to run, but in my case, the SD is not updating with each response.
Hi, having been unable to access PsychoPy (or any related files) due to a network problem, I’m finally back in! As requested, I’ve uploaded the .psyexp file, as well as the .csv file containing the QUEST parameters, and the .csv file containing the experiment output. I hope this helps. Any suggestions would be greatly appreciated.
I think I see the problem here - there is a quotation mark after “quantile” in the method column of your dotStim_QUEST.csv (i.e. it reads quantile'). Please could you remove it and see if the task behaves as you expect?
I notice that currently an error isn’t thrown if the method is not ‘mean’, ‘mode’ or ‘quantile’ psychopy.data.staircase — PsychoPy v2021.1 so we can add that in to control for cases like this.
It’s worth mentioning for anyone reading this with similar issues, you still need the following code if you want to see each level of the staircase in the output .csv:
thisExp.addData('level', level)
thisExp.nextEntry()# add a new row to the output file
Also, I needed to add a value for ‘range’ in the excel file containing the QUEST parameters, otherwise the trials progress in very small increments (e.g., 0.000001).
Hello, I am also building a QUEST staircase to achieve a contrast sensitivity threshold.
Could you explain the range of possible values for each of the variables; particularly, startVal and level? I have set “foregroundColor” to “level” but I see options to set color to Psychopy RGB [-1:1], Normalized RGB [0:1], and 8-bit RGB [0:255]. I cannot tell which of the three "level’ refers to.
I want the contrast to change from high to low but the direction of the staircase is not consistent. I often end with a high contrast stimulus.
Side note, when I get one staircase to work, I’d like to have 3 interleaved staircases, starting with high contrast, medium contrast, or low contrast.
Would appreciate insight on how the value range of these numbers, thanks!
Hi, you’ve mentioned that you have got the QUEST working using the builder.
The staircase seems to be working for us but we are unable to get the stimulus threshold, I give more details and the scripts in the link below we will be grateful if you can give us some advice, thanks!
