I am conducting a psycholinguistic experiment. Each trial consists of the subject responding to a word by pressing a button.The design of my experiment is as follows:
5 blocks of a 100 trials each (each trial is a response). In each block, 50 trials are
Regular and 50 are
Random. Response time (RT) is the dependent variable. This experiment is partly a learning experiment. I expect RTs to be faster in the
Regular condition because there is learning which allows for faster responses.
I therefore want to test the difference in mean response time (RT) between the two conditions of my experiment.I know that the model for the ANOVA would be something like
RTs ~ Type of Trial (`Regular` and `Random`) + ...
I have two related questions
Should I use
Blockas the other factor? (or both?) Normally I would compare mean RT for each condition across blocks, but it is possible that within blocks, there is already changes in RT between trials. So, is
Trialor both my factor? (besides the condition factor).
Since I expect variation across participants, should I include
Subjectas an Error variable in the model?
I am doing my analysis in R, in case anyone wants/can provide some advice in that format, but also general statistical advise is much appreciated.