The present overview demonstrates that stress, fear, novelty, and learning processes are associated with arousal and increases of extracellular levels of cortical and hippocampal ACh, independently of increases of motor activity. Forebrain cholinergic systems appears to be regulated by GABAergic and glutamatergic inputs. However, several other neurotransmitter systems play a role.
        
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Pepeu G, Blandina P (1998) The acetylcholine, GABA, glutamate triangle in the rat forebrain Journal de Physiologie (Paris)92: 351-5
Pepeu G, Blandina P (1998) Journal de Physiologie (Paris)92: 351-5