Fig. 2

Experimental procedures of n-back tasks. a. verbal 1-back; b. visuo-spatial 1-back; c. verbal 2-back; d. visuo-spatial 2-back.
Experimental procedures of n-back tasks. a. verbal 1-back; b. visuo-spatial 1-back; c. verbal 2-back; d. visuo-spatial 2-back.