What are you trying to achieve?:
I have three types of stimuli in my experiment: neg_vis, neg_rea and neu. They are presented in a randomized order. I want to configure a parallel port so that i know when each type of stimuli was presented.
What did you try to make it work?:
So i wrote some lines of code to create a list called “trigger”, in such a manner that neg_vis corresponds to 31, neg_rea to 32 and neu to 33:
(In the “begin experiment tab”):
#Define lists of images and shuffle:
instruction =
useRows =
trigger =
trialTypes = [1,1,1,2,2,2,3,3,3]
neutral = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]
shuffle(neutral)
negative = [30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89]
shuffle(negative)
#Distribute images and instructions for each trial, separating in blocks:
for Idx in range(10):
shuffle(trialTypes)
for Jdx in range(9):
if trialTypes[Jdx] == 1:
instruction.append(‘Visualizar’)
useRows.append(negative.pop())
trigger.append(31)
elif trialTypes[Jdx] == 2:
instruction.append(‘Reavaliar’)
useRows.append(negative.pop())
trigger.append(32)
else:
instruction.append(‘Visualizar’)
useRows.append(neutral.pop())
trigger.append(33)
I then added a parallel port component. I set the start of the parallel port to be “$image.status == STARTED” and the duration to be 0.1s. And in the data tab of this component i set the start data to be “trigger[trials.thisN]”.
What specifically went wrong when you tried that?:
The parallel port is not sending the triggers. The data sheet shows only the time in which the image started. Of course, if i add “thisExp.addData(‘trigger’,trigger[trials.thisN])” and get the triggers in the datasheet. However, i will not be able to see it in other softwares, like Nirstar, if i don’t use a parallel out to send the trigger numbers 31, 32 and 33.
HOW DO I VISUALIZE THE TRIGGERS 31, 32 AND 33 THROUGH A PARALLEL PORT?
