Alpha waves

Alpha waves are a type of brain wave that are typically associated with a state of relaxed, calm alertness. They are one of several different types of brain waves that can be detected and measured using an electroencephalogram (EEG).

History

The existence of alpha waves was first discovered by the German psychiatrist Hans Berger in the early 20th century. Berger was the first to record human brain activity using an EEG, and he named the waves he discovered "alpha" because they were the first type he identified.

Characteristics

Alpha waves have a frequency of between 8 and 12 Hz. They are most commonly detected in the posterior regions of the brain, particularly when the eyes are closed. However, they can also be detected in other parts of the brain, and their presence can be influenced by factors such as mental state, age, and health.

Function

The exact function of alpha waves is not fully understood, but they are thought to play a role in network coordination and communication. When a person is in a relaxed state, such as during meditation or just before falling asleep, alpha waves are often dominant. They are also associated with states of calm alertness and creative problem solving.

Clinical significance

Abnormal alpha wave activity can be a sign of various medical conditions. For example, excessive alpha activity can be a sign of thalamus damage, while reduced alpha activity can be associated with conditions such as attention deficit hyperactivity disorder (ADHD) and insomnia. Alpha waves are also often studied in research on meditation and mindfulness, as these practices have been found to increase alpha wave activity.

See also

• Beta waves
• Delta waves
• Theta waves
• Gamma waves