Figure 2. Schematic diagram of the influence of different neurotransmitters on the state-dependent memory produced by morphine. Morphine state-dependent learning could be affected by the cholinergic (Jafari et al., 2006), GABAergic (Zarrindast et al., 2006e), dopaminergic (Zarrindast et al., 2006b), histaminergic (Zarrindast et al., 2006d), glutamatergic (Zarrindast et al., 2014), and adrenergic systems (Khavandgar et al., 2002). These neurotransmitters modify morphine state-dependent memory.
