Millisecond Forums

Hi,

Question:
Is there a function that will allow me to delete subsequent available trials if a specific condition is met?

My task:
I am trying to create a short recognition memory task (old v. new judgments) in which there are 16 trials (randomized). Each trial will display 1 image pulled randomly from a group of 4. Each group will contain 4 images from the same category:

1. “Old” and contain emotion content
2. "Old” and contain neutral content
3. “New” and contain emotion content
4. “New” and contain neutral content

There are 4 categories that each image group belongs to, and 3 groups of 4 images per category (48 images total):

1. positive/social
2. negative/social
3. positive/non-social
4. negative/non-social

I need to make sure that out of the 16 trials shown as follows:

8 “old” trials

• 4 emotion content
• 1 positive/social
• 1 negative/social
• 1 positive/non-social
• 1 negative/non-social
• 4 neutral content
• 1 positive/social
• 1 negative/social
• 1 positive/non-social
• 1 negative/non-social

8 “new” trials

• 4 emotion content
• 1 positive/social
• 1 negative/social
• 1 positive/non-social
• 1 negative/non-social
• 4 neutral content
• 1 positive/social
• 1 negative/social
• 1 positive/non-social
• 1 negative/non-social

My problem:
Once an image from a specific group is shown, I want the rest of the group to be eliminated from the available selection pool. 
I have done this in the past with less complicated constraints by simply using the “/select” and “/resetinterval” attributes, but this has not been working for me with this design.
I have also tried functions like “removeitem()”, but because I can only specific the item index and not the specific text in an item list,this creates issues with my item pools when randomizing (what was at index 3 becomes index 2 when the item at index 1 is deleted and so on).
“Clearstimulusframes()” does delete the frames from a trial (if I create a single trial for each image), but the trial will still run and simply not display stimuli.

If there is a way or function that will allow me to delete subsequent available trials if a specific condition is met, that would be great.

Any help would be greatly appreciated.

Jess

Stimulus pool:

"PositiveSocial_emotion_old_group1.jpg"
"PositiveSocial_neutral_old_group1.jpg"
"PositiveSocial_emotion_new_group1.jpg"
"PositiveSocial_neutral_new_group1.jpg"

"PositiveSocial_emotion_old_group2.jpg"
"PositiveSocial_neutral_old_group2.jpg"
"PositiveSocial_emotion_new_group2.jpg"
"PositiveSocial_neutral_new_group2.jpg"

"PositiveSocial_emotion_old_group3.jpg"
"PositiveSocial_neutral_old_group3.jpg"
"PositiveSocial_emotion_new_group3.jpg"
"PositiveSocial_neutral_new_group3.jpg"

"NegativeSocial_emotion_old_group1.jpg"
"NegativeSocial_neutral_old_group1.jpg"
"NegativeSocial_emotion_new_group1.jpg"
"NegativeSocial_neutral_new_group1.jpg"

"NegativeSocial_emotion_old_group2.jpg"
"NegativeSocial_neutral_old_group2.jpg"
"NegativeSocial_emotion_new_group2.jpg"
"NegativeSocial_neutral_new_group2.jpg"

"NegativeSocial_emotion_old_group3.jpg"
"NegativeSocial_neutral_old_group3.jpg"
"NegativeSocial_emotion_new_group3.jpg"
"NegativeSocial_neutral_new_group3.jpg"

"PositiveNonSocial_emotion_old_group1.jpg"
"PositiveNonSocial_neutral_old_group1.jpg"
"PositiveNonSocial_emotion_new_group1.jpg"
"PositiveNonSocial_neutral_new_group1.jpg"

"PositiveNonSocial_emotion_old_group2.jpg"
"PositiveNonSocial_neutral_old_group2.jpg"
"PositiveNonSocial_emotion_new_group2.jpg"
"PositiveNonSocial_neutral_new_group2.jpg"

"PositiveNonSocial_emotion_old_group3.jpg"
"PositiveNonSocial_neutral_old_group3.jpg"
"PositiveNonSocial_emotion_new_group3.jpg"
"PositiveNonSocial_neutral_new_group3.jpg"

"NegativeNonSocial_emotion_old_group1.jpg"
"NegativeNonSocial_neutral_old_group1.jpg"
"NegativeNonSocial_emotion_new_group1.jpg"
"NegativeNonSocial_neutral_new_group1.jpg"

"NegativeNonSocial_emotion_old_group2.jpg"
"NegativeNonSocial_neutral_old_group2.jpg"
"NegativeNonSocial_emotion_new_group2.jpg"
"NegativeNonSocial_neutral_new_group2.jpg"

"NegativeNonSocial_emotion_old_group3.jpg"
"NegativeNonSocial_neutral_old_group3.jpg"
"NegativeNonSocial_emotion_new_group3.jpg"
"NegativeNonSocial_neutral_new_group3.jpg"