baseline vs. anticipation
I am working on a data set of pupil diameter, recorded while the participants had been touched on their arm, either based on their choice (of the touch characteristics) or randomly. We are looking into the effects of the touching on the pupil size.
My question is, do you know of any papers about whether the few seconds before a stimulation (here the touching), which is normally used as baseline, could be thought of as an anticipation phase?
I need to know if this anticipation phase needs to be studied separately, and if this anticipation makes the phase not suitable to be used as baseline?
Thanks in advance for your kind guidance.