works better the less the brain is engaged 
(ROOT (S (VP (VBZ works) (ADVP (JJR better)) (ADVP (ADVP (DT the) (RBR less)) (SBAR (S (NP (DT the) (NN brain)) (VP (VBZ is) (VP (VBN engaged)))))))))
(ROOT (S (VP (VBZ ) (ADVP (JJR )) (ADVP (ADVP (DT ) (RBR )) (SBAR (S (NP (DT ) (NN )) (VP (VBZ ) (VP (VBN )))))))))