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<p><b>New page</b></p><div>[[File:eeg_delta.svg|thumb|eeg_delta.svg]] [[File:Sleep_EEG_Stage_4.jpg|thumb|left|Sleep_EEG_Stage_4.jpg]] '''Delta wave'''<br />
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A '''Delta wave''' is a type of high amplitude brain wave found in humans. These waves are typically associated with the deepest stages of [[sleep]], known as [[slow-wave sleep]] (SWS), and are characterized by a frequency range of 0.5 to 4 Hz. Delta waves are crucial for restorative sleep and are most prominent in infants and young children, gradually decreasing with age.<br />
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==Characteristics==<br />
Delta waves are the slowest and highest amplitude brain waves. They are generated in the [[thalamus]] and are most commonly observed during the third and fourth stages of [[non-rapid eye movement sleep]] (NREM sleep). These waves are essential for the consolidation of [[memory]], the release of growth hormone, and overall physical and mental restoration.<br />
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==Function==<br />
Delta waves play a significant role in the body's healing and regeneration processes. During deep sleep, the brain is less responsive to external stimuli, allowing for the repair of tissues, the strengthening of the immune system, and the consolidation of [[long-term memory]]. The presence of delta waves is also associated with the reduction of [[cortisol]] levels, which helps in stress management.<br />
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==Clinical Significance==<br />
Abnormal delta wave activity can be indicative of various neurological conditions. For instance, excessive delta wave activity in awake adults may suggest [[brain injury]], [[encephalopathy]], or other forms of [[brain dysfunction]]. Conversely, a lack of delta wave activity during sleep can be a sign of [[sleep disorders]] such as [[insomnia]] or [[sleep apnea]].<br />
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==Measurement==<br />
Delta waves are typically measured using [[electroencephalography]] (EEG), a non-invasive method that records electrical activity in the brain. EEG is commonly used in [[sleep studies]] to monitor and analyze sleep patterns, including the presence and quality of delta wave activity.<br />
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==Related Pages==<br />
* [[Brain wave]]<br />
* [[Electroencephalography]]<br />
* [[Sleep]]<br />
* [[Non-rapid eye movement sleep]]<br />
* [[Slow-wave sleep]]<br />
* [[Memory consolidation]]<br />
* [[Sleep disorder]]<br />
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==References==<br />
{{Reflist}}<br />
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==External Links==<br />
{{Commons category|Delta waves}}<br />
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[[Category:Neuroscience]]<br />
[[Category:Sleep]]<br />
[[Category:Electrophysiology]]<br />
[[Category:Brain waves]]<br />
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