See Maus et al NeuroImage (2009 or 2010).
John Gelburg wrote:
> Hi,
>
> In the visual block design experiment I have experimental blocks,
> which are interleaved with baseline fixation blocks. Given that the
> total number of TRs per condition is the same, what is more efficient:
> to make larger number of shorter blocks or smaller number of longer
> blocks? Clearly, given that every experiment block is followed by
> fixation block the experiment with shorter blocks would be longer.
> Suppose, I am ready to pay this price. What are the other
> considerations? I am talking about block length approximately 10-16
> seconds.
>
> Thanks,
> John
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