Brain waves
Brain waves appear when groups of neurons fire in synchrony. We can measure them and group them by frequency (how fast they cycle or how fast neurons fire). Different ranges tend to show up in different states, and good functioning depends on a balance between them.
Delta (~0-4Hz)
Deep restoration
Delta is most common in deep sleep. It supports physical recovery and memory processing, including the transfer to long-term memory.
- Too much when awake: brain fog, slow thinking, low energy
Theta (~4-8Hz)
Creativity and insight
Theta often shows up in drowsiness, daydreaming, and creative thinking. It helps with imagination and learning.
- Too much: spaciness, poor focus
- Too little: reduced creativity, rigid thinking
Alpha (~8-12Hz)
Calm focus and flow
Alpha is common when you’re relaxed but alert. It often rises in flow states—when you’re engaged without strain.
- Too low: tension, racing mind
- Too high: zoning out, low drive
Low Beta / SMR (~12-15Hz)
Steady focus and body calm
This range supports stable attention with a calmer body. On the sensorimotor strip it’s called SMR and is linked to physical relaxation.
- Too low: distractible, difficulties falling asleep
- Too high: restless, light sleep
Beta (~15-23Hz)
Active thinking
Beta supports focused attention, problem-solving, and getting things done.
- Too high: stress, racing thoughts
- Too low: low drive, slow processing
High Beta (~23-38Hz)
High alert
High beta is linked to high arousal—intense focus, tension, and scanning for threats. It can be especially draining when it stays on.
- Too much: anxiety, irritability, fatigue, trouble sleeping
Gamma
Clarity and integration
Gamma is associated with moments of sharp clarity, insight, fast learning, and “things clicking” when multiple brain regions work in sync.
- Too low: mental fog, slower thinking
- Too high: overstimulation and fatigue
See what your brain is telling you
A brain map reveals the patterns that shape how you think, feel, and perform.