Shows how the Rasch model i s a u n i t m a i n t a i n i n g process (Thurstone, 1931) which enables the construct i o n of a d d i t i v i t y (Campbell, 1920) and hence fundamental measurement (Luce and Tukey, 1964). Provides the b a s i c s t a t i s t i c s f o r determining the extent to which a d d i t i v i t y has been approximated w i t h p a r t i c u l a r data. (A note reviews the ...

• Different measures of explicit and implicit processes don’t always agree. Additivity the is controversial both within outside motor learning studies. Bias need to be considered field. We a better experimental characterization processes. Adaptation tasks are key tool in characterizing contribution sensorimotor learning. However, different assumptions ideas underlie methods used measure these p...