Which term describes the brain activity characterized by regular and synchronized patterns during deep sleep?

The term that describes the brain activity characterized by regular and synchronized patterns during deep sleep is delta waves. These waves are typically observed in a person during the stages of non-REM (rapid eye movement) sleep, particularly in the deep sleep phase known as slow-wave sleep. Delta waves have a low frequency of 0.5 to 4 Hz and are associated with the restorative processes of sleep, including tissue growth and repair, as well as the consolidation of memories.

In contrast, beta waves, which have a higher frequency, are associated with alertness and active mental engagement. Alpha waves are commonly found when a person is awake but relaxed, often during quiet, meditative states. Theta waves occur in lighter stages of sleep or during relaxation and creativity. Understanding the different types of brain waves helps clarify their specific roles during various states of consciousness and sleep.