Back to PLS HelpPosted on 08/04/16 00:29:37
Number of posts: 9
Hi all,
I have two questions in regard to the onset of stimuli.
1. The fact that PLS rounds up the decimals, does this mean that the timing of your stimuli and your fixation should be devisable by the TR? So, if the TR is 3, the stimuli should be presented for 3 and the fixation duration should be a devisable by 3 (3, 6, 9)?
2. The recommendation of using sequential and ascending order of the scan if we are using the decimals should be always used in conjunction with HRF instead of the Block length option?
I appreciate your response,
All the best,
MR
Replies:
Posted on 08/04/16 08:22:04
Number of posts: 394
See below:
>1. The fact that PLS rounds up the decimals, does this mean that the timing of your stimuli and your fixation should be devisable by the TR? So, if the TR >is 3, the stimuli should be presented for 3 and the fixation duration should be a devisable by 3 (3, 6, 9)?
The timing can be whatever you want so long as there is some variance in the inter-trial intervals. That allows for a better estimation of the average response
>2. The recommendation of using sequential and ascending order of the scan if we are using the decimals should be always used in conjunction with HRF >instead of the Block length option?
Not sure I completely understand this question. Can you rephrase please?
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