3. Results.
3.1 incidence of covariates
The Edinburgh lateral handedness inventory was used to group subjects into right and left-handers. All tasks were performed with the dominant hand. The sample contained eight subject with a negative laterality score(left-handers) accounting for 4.2% of the sample.A median score was determined because the distribution was skewed. The median laterality score in right-handers was 87.5 (interquartile rang:30) and 58.8 (interquartile rang: 42) in left - handers. Right-handers showed stronger lateralization