The essential oil of bergamot enhances the levels of amino acid neurotransmitters in the hippocampus of rat:
Implication of monoterpene hydrocarbons
Recently, bergamot essential oil has been found to reduce excitotoxic damage to cultured human neuronal cells in vitro and may therefore have neuroprotective properties. 
Conclusions and Implications:
Our data demonstrate that BEO reduces neuronal damage caused in vitro by excitotoxic stimuli and that this neuroprotection was associated with prevention of injury-induced engagement of critical death pathways.
Keywords: bergamot essential oil, neuroprotection, NMDA receptors, excitotoxicity, cell death, SH-SY5Y neuroblastoma cells, Akt, GSK-3β, calpain I