Logging Multiple Key Duration While Video Running

satriopriyo

Hello there,

I currently learning about OpenSesame and find a problem with logging. Here is my experiment that I want to make :
1. There is one video stimulus and it will last long 8 seconds.
2. I want to asses the hallucinations-experiences from participants while they watch the video stimulus.
3. Participant will press and hold "space" when the hallucination comes.
4. I already read your articles in http://forum.cogsci.nl/index.php?p=/discussion/37/solved-how-to-log-the-duration-of-a-key-press and http://forum.cogsci.nl/index.php?p=/discussion/1199/solved-log-time-and-duration-of-multiple-key-presses
5. I think the second link suits me well, but unfortunately the log file is empty
6. What I really need is the key press duration time without forcing video end

Could anyone help me solve this problem?

Kind Regards,
Satrio

eduard

Hi Satrio,

I haven't tried it, but if you modify the code in the link above in this way, does it work?

# needs to be put in the run phase!!!!
import pygame
t0 = clock.time()
keydown = False
keyup = False
timeout = 10000 # how long do you want to wait?, Probably length of video
while True:  
    # Determine the RT, i.e. the time relative to the loop start
    response_time = clock.time() - t0
    # Get all input events
    for event in pygame.event.get():
        # Print KEYDOWN and KEYUP events, including the key name
        # and the RT.
        if keyup == True and event.type == pygame.KEYDOWN:
               keydown =True
        if keydown:
             if event.type == pygame.KEYUP:
                 var.key = pygame.key.name(event.key)
                 var.respTime = clock.time()
                 keydown = False
                 keyup = True
    if clock.time()-t0 > timeout: 
        break
log.write_vars()

Hope this helps.

Eduard

satriopriyo

Hello Eduard,

Thanks a lot for your reply! It worked and the log files shown up but unfortunately it was very messy. Also the things that I need (multiple duration key-presses) weren't there.

For now, I change it into multiple single press with two buttons (z for when they saw the hallucination and m for when they think the hallucination ended) since I still confuse about pygame's syntax. It helps me to fulfill my need now, but I still want to know how to record multiple duration key-presses and I still try to find it hehe. I hope you would continue to discuss this topic until we find it .

Once again, many thanks for you Eduard!

Kind Regards,
Satrio