Make text appear based on key press (give user real time feedback) in psychopy

Question

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.

Answer 1

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.

Here is a picture of my trial as an example.