Getting a total loop time on a break keystroke.

[Lazaros Gonidis]

Hello guys.

I am designing an experiment and one of the trials is a stroop and I want the participant to stop the Stroop when they wish by hitting "return".
I have added the lines
if event.getKeys(["return"]):
    trial.finished = True

and it works fine. the trial finishes and I move forward. However, I want to log the total time that the participant has spent on that specific Stroop trial. Any ideas on how I could that?
I experimented with clocks but no luck so far.

Thank you,

Lazaros.

[Jonas Lindeløv]

Hi Lazaros

You would reset the clock at the beginning of the trial and then record the elapsed time when return is pressed. So it would contain some of these elements:

# Initiate clock

trialClock = core.Clock()

# Loop through trials

for trial in trialList:

   # Present trial

   stim.draw()

   win.flip()

   trialClock.reset()

   

   # Record response

   response = event.getKeys(['return', 'r', 'g', 'b'])  # allowed responses

   if response:

      trial['rt'] = trialClock.getTime()

      if response[0] == 'return': trial.finished = True

      if response[0] in ['r','g','b']: trial['answer'] = response[0]

[Lazaros Gonidis]

Thank you for your reply Jonas,

I am afraid I phrased my question in a wrong way. I want the elapsed time for the total duration of the Stroop. So lets say if the participant already responded for the first 10 stimuli and then press Return I would like to know exactly how low he/she stayed in the loop.
Do you think it would work if I do not reset and I get the clock as soon as return is pressed?

[Jeremy Gray]

I am afraid I phrased my question in a wrong way. I want the elapsed time for the total duration of the Stroop. So lets say if the participant already responded for the first 10 stimuli and then press Return I would like to know exactly how low he/she stayed in the loop.
Do you think it would work if I do not reset and I get the clock as soon as return is pressed?

well, did you try it? :-)

--Jeremy

[Lazaros Gonidis]

I tried it and works perfectly fine.
Thanks for the help everyone.

Lazaros.