Research suggests that cortical circuits generate delta <1Hz, whereas higher-frequency delta rhythms are an intrinsic property of thalamacortical cells and intracortical network interactions. Importantly, delta may also reflect general neurotransmitter activity, specifically dopamine and acetylcholine. Sleep walking and talking tend to occur while delta production is high. ![]() It has been found that individuals with various types of brain injuries produce delta waves in waking hours, making it extremely difficult to perform conscious tasks. An excess of delta waves when a person is awake may result in learning disabilities and ADHD, and make it extremely difficult to focus. At this stage, healing and regeneration are stimulated, and are considered essential for the restorative properties of sleep. ![]() Delta Waves (1-4 Hz) are slow brainwaves, which begin to appear in stage 3 of the sleep-cycle, and by stage 4 dominate almost all EEG activity.
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