Functional hypotheses of the coeruleocortical noradrenergic projection: A review of recent experimentation and theory

The behavioral function of the coeruleocortical system and the hypotheses implicating its role in mediating selective attention and behavioral inhibition to anxiogenic cues are evaluated. The diverse pattern of results produced by lesions induced by 6-hydroxydopamine on a variety of tasks (appetitive conditional discrimination, nonreversal shift, blocking, latent inhibition, distraction, taste aversion, neophobia, and conditioned emotional response) are integrated to achieve a tentative hypothesis of coeruleocortical noradrenergic function.