( Contrast ( ( ( affects ( flicker ( and ( speed perception ) ) ) ) differently ) . ) )
(ROOT (S (NP (NNP Contrast)) (VP (VBZ affects) (NP (NN flicker) (CC and) (NN speed) (NN perception)) (ADVP (RB differently))) (. .)))
Contrast affects flicker and speed perception differently.
(ROOT (S (NP (JJ Different) (NNS media)) (VP (VBP affect) (NP (NP (DT the) (NN speed)) (PP (IN of) (NP (NN light))))) (. .)))