I have a stimulus loop in psychopy that displays images for 4 seconds that subjects make binary decisions about. I would like to give them feedback as to which choice they have made.
I.e.: a image gets displayed for 4 seconds with white 'YES' and 'NO' displayed on either side of it. When the user presses a key, the corresponding word turns red. If they then press a different key, it switches. After 4 seconds, the next image appear with white words.
Does anyone know how to go about doing this? Many thanks for any suggestions.
You can do this with a custom code component. Add the code component to your routine.
Under the "Each Frame" tab add the following code:
if (t >=4) and (t < 8):
if clear_keys:
event.getKeys()
clear_keys = False
else:
theseKeys = event.getKeys(keyList=['y', 'n'])
if 'y' in theseKeys:
Yes.color = 'red'
No.color = 'white'
elif 'n' in theseKeys:
Yes.color = 'white'
No.color = 'red'
Under the "Begin Experiment" tab add the following code:
clear_keys = True
You will need to change the Yes and No objects in the script to the names of your text components. You will also need to change the number 4 to the start time of the picture and number 8 to the end time.
