Which brain wave is least associated with active thought processes?

Delta waves are indeed the brain waves least associated with active thought processes. They are the slowest brain waves, typically ranging from 0.5 to 4 Hz, and are most prevalent during deep sleep stages, particularly in non-REM sleep. During this time, the brain is engaged in restorative processes rather than active cognitive functions.

In contrast, beta waves, which are faster and occur at 12 Hz or higher, are typically associated with active thinking, problem-solving, and focused mental activity. Alpha waves, found in the frequency range of 8-12 Hz, often reflect a state of relaxation while still being awake and aware, often occurring prior to sleep or during meditation. Theta waves, which range from 4-8 Hz, are prevalent during light sleep or deep relaxation but can also be found in states of creativity and insight.

Delta waves stand out for their association with unconsciousness and the deepest stages of sleep, making them the least connected to active thought processes compared to the other wave types.