Alpha Waves (EEG)

The alpha rhythm was described by Hans Berger in 1929 in the first human EEG recording, when he noticed it appeared on closing the eyes and vanished on opening them or on concentrating — the classic «alpha blocking» reaction. Far from being mere resting «noise», modern research views alpha as an active inhibitory mechanism: Klimesch's inhibition-timing hypothesis proposes that alpha synchronization selectively suppresses task-irrelevant cortical regions to protect relevant processing, while its desynchronization releases those areas to act.

In longevity and mental health, alpha waves index a parasympathetic autonomic state (relaxation) and sustained focus without anxiety. L-theanine, the amino acid in green tea, measurably increases alpha power at doses of 200–250 mg, producing relaxation without sedation — the «relaxed alertness» sought by students and professionals. Meditation, slow breathing, sensory-deprivation flotation and neurofeedback also train this rhythm. A robust alpha pattern is associated with lower allostatic load, better heart rate variability (HRV) and resilience to chronic stress — factors that directly affect healthy aging.