Dear all,
Thinking about a previous discussion on the list, we said that
reaction time effects are better captured by a variable epoch
durations, which adapts to reaction time length.
In a couple of papers was shown that a variable epoch aproach is
better than parametric modulations.
http://www.sciencedirect.com/science/article/B6WNP-4T77G33-4/2/cc5ef4a8e9fbff5b4a99bd5f05663bf9
http://www.columbia.edu/cu/psychology/tor/Posters/grinband_HBM06.pdf
But isn't this the same as adding a dispersion derivative, which would
convolve a longer HRF automatically for RTs and capture that signal
the same way as a variable epoch approach?
Best regards.
Dorian.
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