If I understood correctly, you would like to enter multiple behaviors for each condition per subject like the one listed below, is it correct?

=====================================================================

                   Label                                                                           Behaviors

==========================                              ============================

group1      condition1      subject1                              bid1      bid2      bid3       ...     bid35

group1      condition1      subject2                              bid1      bid2      bid3       ...     bid35

group1      condition2      subject1                              bid1      bid2      bid3       ...     bid35

group1      condition2      subject2                              bid1      bid2      bid3       ...     bid35

group2      condition1      subject1                              bid1      bid2      bid3       ...     bid35

group2      condition1      subject2                              bid1      bid2      bid3       ...     bid35

group2      condition1      subject3                              bid1      bid2      bid3       ...     bid35

group2      condition2      subject1                              bid1      bid2      bid3       ...     bid35

group2      condition2      subject2                              bid1      bid2      bid3       ...     bid35

group2      condition2      subject3                              bid1      bid2      bid3       ...     bid35

35 bids per run per subject). I'd like to include all of these bids in my behavioural PLS analysis, and tie them to the onset of each food item

Deb..

I think that the design Jimmy shows would allow you to determine which of the 35 bids in each condition is most strongly correlated with the AVERAGE response in the condition -

If you want to look at Condition1_Bid1_Food1 separately from Condition1_Bid35_Food35, you would need to turn off 'average across runs/trials' when you make the datamat - and be concerned that you have sufficient numbers of subjects to look at the data at this single trial correlation level..

Let us know if that is what you meant..

cheers

Nancy

are all of the runs the same? - i.e., you have n=6 observations of condition1_bid1?

I need to continue my question of "If I understood correctly, you would like to enter multiple behaviors for each condition per subject like the one listed below, is it correct?" here.

Since the answer is "yes", theoretically, the large file with all the bids under this "row order" can be loaded after you click "Load Behavior Data" button. However, in reality, you can't do this!

Assuming you only have 2 groups and 2 conditions (from the context above), you will end up with 140 rows. Depending on the brain size and temporal window size, the dataset could easily beyond the capability of your computer. Let's assuming that you have temporal window size of 8, and your volume size is [91 109 91], and your brain size could be 91*109*91/2 = 451314. Then, 140*8*451314 = 505471680. Assuming you are using single datatype (4 bytes), The total size of your dataset could be end up to 140*8*451314*4 = 2021886720, i.e. 2GB. Plus, the accessory data etc, I am sure that it will go beyond your computer (or even MATLAB) capability.

I think that the above design need to be reconsidered. One suggestion is that you enter 2~3 bids each time. i.e.:

============================================================

                   Label                                                                   Behaviors

==========================                              ===================

group1      condition1      subject1                              bid1      bid10       bid35

group1      condition1      subject2                              bid1      bid10       bid35

......

Frankly speaking, I am an entrylevel application developer here, and have only very limited knowledge about the PLS design. If you encounter problem like "application crash", "how to use", etc. Please feel free to ask me. Other theoretical questions, or any question related to PLS design, I don't have much answer, and people with more PLS experience will provide you appropriate answer here.

Thank you Jimmy and Nancy for your help! My apologies for the delay in responding -- I was waiting to hear back from my supervisor before writing more.

At any rate, colleagues of ours carried out the same analysis, so I'm sure it's possible, but perhaps I am not explaining it properly. For each subject, I want to input the following information:

subject1                              bid1      bid2      bid3       ...     bid35

subject2                              bid1      bid2      bid3       ...     bid35

...