Six months postintervention , neurofeedback participants maintained significant gains on Conners 3-P ( Inattention effect size [ ES ] = 0.34 , Executive Functioning ES = 0.25 , Hyperactivity/Impulsivity ES = 0.23 ) and BRIEF subscales including the Global Executive Composite ( ES = 0.31 ) , which remained significantly greater than gains found among children in CT and control conditions .