Directed attention fatigue (DAF) is a neuro-psychological phenomenon that results from overuse of the brain's inhibitory attention mechanisms, which handle incoming distractions while maintaining focus on a specific task. The greatest threat to a given focus of attention is competition from other stimuli that can cause a shift in focus. This is because one maintains focus on a particular thought by inhibiting all potential distractions and not by strengthening that central mental activity.[1][page needed] Directed attention fatigue occurs when a particular part of the brain's global inhibitory system is overworked due to the suppression of increasing numbers of stimuli. This temporary condition is not a clinical illness or a personality disorder. It is rather a temporary fatigue of the inhibitory mechanisms in the brain.[2][unreliable medical source?] According to inhibition theory, it is natural for one to alternate between periods of attention and distraction. Although one's efforts may involve very different tasks, each incoming stimulus calls upon the same directed attention mechanism.[citation needed]
^Itti L, Geraint R, Tsotsos JK, eds. (2005). Neurobiology of Attention. Boston: Elsevier Academic Press. ISBN 978-0-12-375731-9. OCLC 58724292.
^Beadle S. "Directed Attention Fatigue and Restoration". Troutfoot.com. Retrieved 20 February 2011.
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