Univariate analysis of change scores indicated group differences on Stroop word reading and Stroop color naming ( confidence interval [ CI ] 1.9-10 .0 and 2.1-8 .8 ) , on Trail Making Test B ( CI 0.5-10 .3 ) , and on Wechsler Adult Intelligence Scale similarities ( CI -0.01 to 1.5 ) , with STN DBS showing greater negative change than GPi DBS .