Hi Douglas,

I have a question about the tr. My trial consists of a fixation point of 500 ms plus a stimulus of 1000 ms, thereby the tr would be of 1500 ms. However, I would like to add a null event between all trials, which is variable (from 500 to 4000 ms, of an average of 1 s). My question is: Should I add to the tr the null event time average (1 s)? 

Thanks for your help.

All the best,

C


On Fri, May 2, 2014 at 9:24 PM, Douglas Greve <greve@nmr.mgh.harvard.edu> wrote:

It is the number of samples in the time series. Eg, if you scan for 10min with a TR=2, then you would have 600/2=300 time points
doug



On 5/2/14 3:07 PM, Conchy PF wrote:

Dear Douglas,

I would like to use optseq2 to set up my experiment sequence. However it is not clear for me what “number of time points” means. I guessed that it was the number a waveform is sampled, but I saw in some mailing lists that it is the time the event is repeated during the run. 

In case it is the first meaning, how can I get the information about the number a waveform is sampled?

Thanks in advance and kind regards.

Conchy




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