change of the duration of the loop

MariaRosa

hi, i'm new on opensesame. I have to develop an experiment and i have a problem with the duration of the loop. In particular, i know that on default the system is on "repeat each cycle 1.00x" and i know how to change the number of ripetitions, but this is not important for my aim. Instead, i need to make sure that the duration of the loop is 15 seconds. Do you have any idea how to do this?

Thanks

MariaRosa

Could i write <<"break if" 15>> or something similar?

eduard

Hi Maria,

The loop table is not useful for when you have a time-based loop rather than a repetition based loop. You can still use the loop item in combination with measure the time on each iteration, but I think it makes more sense to use Python coding in an inline_script. For example like this:

# make 2 canvasses
cv = Canvas()
cv2 = Canvas()
cv.circle(0,0,10,fill=True)
cv2.rect(0,0,10,10,fill=True)
# make a response item
kb=Keyboard()
# start time
t0= clock.time()
# loop over the two images and responses between them
while clock.time()-t0<15000 # run for 15000 max
    if k==None:   
         cv.show
    k,t = kb.get_key(timeout=1000)
    if k != None: 
        cv2.show()

Does this make it clear how to use a time-based loop?

Eduard