Definition of brainwave

"Brainwave" is a relatively recent term, dating back to the early 20th century. It originated from the discovery of **electroencephalography (EEG)**, a method for recording electrical activity in the brain. The term was coined to describe the **electrical patterns** observed on an EEG, which were thought to be similar to waves on the ocean. These waves, now known as **brainwaves**, were considered to be **"waves" of electrical activity** in the brain. The term quickly gained popularity and has been used ever since to describe both the electrical activity and the creative ideas or inspirations that are often associated with them.