Dopamine D-1 and D-2 receptors in relation to reward and performance: a case for the D-1 receptor as a primary site of therapeutic action of neuroleptic drugs.

CONTENTS 1. Introduction 144 1.1. Dopamine receptor subtypes and neuroleptic drugs 144 1.2. Dopamine's functional role: Reward versus performance 144 1.3. Synergism between D-1 and D-2 receptors: A relation to the reward/performance dichotomy? 144 2. Psychological descriptions 145 2.1. Definitions of reward 145 2.2. Definitions of the distinction between reward and performance 145 3. Principles for interpretation of evidence 146 3.