**alzheimer"s patients have low acetylcholine levels*: ep i nep hr i ne: excitatory functions in peripheral system, arousal & alertness, heightened attention, norep i nep hr i ne: the cns"s version of epinephrine. adhd: not enough: seroton i n: monoamine neurotransmitter, mood (depression, anxiety, motivation problems etc) depression treatments often target serotonin ex: prozac inhibits serotonin reuptake: dreaming, impulse control, dopam i ne: reward! And motor control planning: dopamine in nucleus accumbens universal pleasure center (all drugs affect it) www. notesolution. com. **drugs: stimulate reward pathway, which reinforces behaviour (further consumption of drugs) ** Binds to 2 different types of cannabinoid recceptors. Cb1: seems to mediate rewarding aspects of cannabinoids, present in hippocampus & many other parts of the brain. mice have smaller appetite & shorter life w/o them. Pept i des: substance p: senses pain, endorph i ns: pleasure, pain moderation. drive placebo effect for pain relief: cck: most prevalent peptide!!!