> Would my statistical power be higher when the trials are more clumped
> together that when they are more spaced out?
Assuming that you are going to model each event separately, I feel the situation would be the other around: you would have higher statistical power with events less clumped together simply because they tend to be less correlated with each other.
See more discussion here:
[
imaging.mrc-cbu.cam.ac.uk]
HTH,
Gang