Brainwaves are the electrical signals produced by the brain. There are various synonyms for the term brainwaves such as neural oscillations, cerebral rhythms, mind waves, and cortical activity. Neural oscillations refer to the rhythmic activity of the neurons in the brain. Cerebral rhythms mean the repetitive patterns of electrical activity in the brain. Mind waves describe the patterns of electrical activity that reflect one's mental state. Cortical activity, on the other hand, pertains to the electrical signals produced by the brain's outermost layer. These terms are often used interchangeably in scientific studies, and their understanding is essential in the fields of psychology, neuroscience, and medicine.