alpha-Adrenergic receptors in auditory cue detection: alpha(2) receptor blockade suppresses false alarm responding in the rat

作者：Brown Dewey C II^*; Co Marissa S; Wolff Ruben C; Atzori Marco

来源：Neuropharmacology, 2012, 62(7): 2178-2183.

DOI：10.1016/j.neuropharm.2011.12.024

• Sustained attention
• Vigilance
• Selective attention
• alpha 1
• Alertness

Numerous studies have suggested a facilitatory role of the noradrenergic system in attention. Cognitive functions relating to attentive states arousal, motivation, behavioral flexibility, and working memory are enhanced by norepinephrine release throughout the brain. The present study addresses the role of the adrenergic system on stimulus validity and sustained attention within the auditory system. We examined the effects of adrenoceptor stimulation via systemic injection of alpha 1 and alpha 2-adrenoceptor antagonist and agonist drugs, prazosin (1 mg/kg), phenylephrine (0.1 mg/kg), yohimbine (1 mg/kg), and clonidine (0.0375 mg/kg), respectively. Our results indicate that alpha 1-adrenergic stimulation is ineffective in modulating the biological assessment of auditory signal validity in the non-stressed rat, while alpha 2-adrenoceptor antagonist and agonist drugs were effective in modulating both accuracy and response latencies in the habituated animal. Remarkably, blockade of alpha 2-adrenoceptors significantly improved the animal%26apos;s ability to correctly reject non-signal events. These findings indicate not only a state dependent noradrenergic component of auditory attentional processing, but a potential therapeutic use for drugs targeting norepinephrine release in neurological disorders ranging from Alzheimer%26apos;s disease to schizophrenia.

• 出版日期2012-6