Fixation point & Picture Pairs all off after changing number of trials


Fixation point & Picture Pairs all off after changing number of trials...
Author
Message
stefaniafranja
stefaniafranja
Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)Esteemed Member (1.9K reputation)
Group: Forum Members
Posts: 23, Visits: 59
Hello Dave, 
Thank you for your previous post about how to change the number of trials. 
Now that I successfully have the amount of trials (yay!), I am finding that some of the picture pairs are presented 6 times, and some are presented 2 times, whereas each picture pair should be presented 4 times. I understand this is probably to do with how I have edited the item_numbers list:
Orignially, it had:
Alcohol_target_itemnumbers
/ items = (
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

Filler_target_itemnumbers
/ items = (
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

Basically, meaning there will be 40 critical, and 40 control trials, resulting in 80 total. 

When I edited it for my own task, I need 160 trials instead of 80, so I simply edited the lists as follows:
Alcohol_target_itemnumbers
/ items = (
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
Filler_target_itemnumbers
/ items = (
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)

Essentially, this should result in each picture pair being presented 4 times. But for some reason, when I (painfully) counted each picture pair, some were presented only once, some were presented twice, some three times, some 4 times, some 5 times... up to 7 times for some. I am not sure why this is the case, when all i have done is doubled what was initially there. 

ALSO!
Since changing the 
/ trials = [1-80] to
/ trials = [1-160],
The probe is now only on the left?? Through the whole task! 

Man, I am feeling really useless at the moment, and any suggestions you have are most welcome!

Thanks in advance, 
stefania 




GO

Merge Selected

Merge into selected topic...



Merge into merge target...



Merge into a specific topic ID...





Reading This Topic

Explore
Messages
Mentions
Search