Tryptophan depletion impairs stimulus-reward learning while methylphenidate disrupts attentional control in healthy young adults: implications for the monoaminergic basis of impuls... by Rogers, R, Blackshaw, A, Middleton, H, Matthews, K, Hawtin, K, Crowley, C, Hopwood, A, Wallace, C, Deakin, J, Sahakian, B, Robbins, T