Editing Delta wave (section)

==Development==

Infants have been shown to spend a great deal of time in [[slow-wave sleep]], and thus have more delta wave activity. In fact, delta-waves are the predominant waveforms of infants. Analysis of the [[Wakefulness|waking]] EEG of a [[newborn]] infant indicates that delta wave activity is predominant in that age, and still appears in a waking EEG of five-year-olds.<ref name="isbn0-632-05361-5">{{cite book |author1=Taylor, Eric |author2=Rutter, Michael |title=Child and adolescent psychiatry |url=https://archive.org/details/childadolescentp00rinc |url-access=limited |publisher=Blackwell Science |location=Oxford |year=2002 |page= [https://archive.org/details/childadolescentp00rinc/page/n175 162] |isbn=0-632-05361-5 }}</ref> Delta wave activity during slow-wave sleep declines during adolescence, with a drop of around 25% reported between the ages of 11 and 14 years.<ref>{{cite web |title=Brain Wave Changes in Adolescence Signal Reorganization of the Brain|publisher=ScienceDaily|date=2006-12-08|url=https://www.sciencedaily.com/releases/2006/12/061207160458.htm|
access-date=2008-03-24}}</ref> Delta waves have been shown to decrease across the lifespan, with most of the decline seen in the mid-forties. By the age of about 75, stage four sleep and delta waves may be entirely absent.<ref>Colrain, I. M., Crowley, K. E., Nicholas, C. L., Afifi, L., Baker, F. C., Padilla, M., et al. (2010). Sleep evoked delta frequency responses show a linear decline in amplitude across the adult lifespan. [Article]. Neurobiology of Aging, 31(5), 874-883.</ref>
In addition to a decrease in the incidence of delta waves during slow-wave sleep in the elderly, the incidence of temporal delta wave activity is commonly seen in older adults, and incidences also increase with age.<ref>Inui, Koji, Eishi Motomura, Hiroyuki Kaige, and Sen Nomura. "Temporal Slow Waves and Cerebrovascular Diseases - Inui - 2008 - Psychiatry and Clinical Neurosciences." Psychiatry and Clinical Neurosciences 55.5 (2001): 525–31. Wiley Online Library. Web. 29 November 2010.</ref>