
Dear R and statistics experts:


I have data of a behavioral experiment with the aim to investigate the effect of a memory task on motor learning. 


Question:
I would appreciate help in figuring out a possible formula to determine whether motor learning across sessions differs between 2 groups.


Design:
- 2 Groups: group A: n=10 subjects, group B: n=10
- 6 motor learning sessions: baseline; immediately after memory task; 6h, 24h, 30d later, and 30d later with a different motor task
- dependent variable: response time (RT)


I tried the following:
(lme4 package of R, I assumed that Subject is the random factor, and Session and Group the fixed factors.)


fm1 <- lmer(RT ~ Session + Group + (1|Subject) + (1|Subject:Session), table)


I would appreciate any help on the formula or the choice of statistical approach.


Thanks!

Marianne,Columbia SC 		 	   		  
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