Mental fatigue reduction

1. Dopamine release vs. dopamine reuptake inhibition (Nootropic Key Ideas)
2. Cerebral blood flow vs. vasodilation (Nootropic Key Ideas)
3. Dopamine vs. serotonin vs. norepinephrine (Nootropic Key Ideas)
4. Phenylpiracetam vs. piracetam (Nootropic Key Ideas)
5. Synergistic effects vs. additive effects (Nootropic Key Ideas)