[I previously posted this on stack overflow but I was advised to bring it here.] I’ve created an experiment in psychopy builder in which participants must vocally name pictures presented onscreen (for example, if a picture of a chair appears, the participant has to respond by saying “chair”). I’ve set up a code component to detect each vocal response, which ends the trial and initiates the next one. This part of the experiment works well, however I’m having trouble integrating EEG recording.
Some important information: My trial loop reads images and triggerVal’s out of a .csv file. I have an image component (called english_naming) that displays images for participants to name out-loud. The component’s STOP field is defined as $vpvk.event_onset - this forces the trial to end and the next one to begin upon detection of a vocal response.
So, here is my (working) code component at present:
from psychopy import parallel
port = parallel.port(address=61432)
vpvk = vk.onsetVoiceKey(
sec=10) # creates the voice key
vpvk.start() #starts recording.
port.setData(triggerVal) # tells psychopy to read trigger values from the .csv file
vpvk.stop() # ends the recording
port.setData(0) # resets the trigger value to 0 for the start of the next trial
My problem is this
At present, parallel port events are time-locked to the start of each trial, but I need them to be time-locked to participant’s vocal responses. I tried inserting if vpvk.event_onset(): above port.setData(triggerVal), but this fails to generate any trigger codes at all. I’ve also tried if english_naming==FINISHED but the same problem occurred. I’ve tried a bunch of variants on these two lines of code, but nothing I can think of seems to work.
I would really really appreciate any advice on this problem. Thanks in advance!