The library

Learn how focus works.

Everything Zone has written about attention, the five brain states, and the in-ear EEG that reads them. Start anywhere. Each guide stands alone and links to the rest.

Guides14

Sections5

States coveredAll five

UpdatedJuly 2026

Start here

What Zone is, how in-ear EEG works, and the model behind everything else.

OverviewWhat is Zone?Neurofeedback earbuds, explained from zero.Guide The scienceHow Zone reads your brain.From electrical signal to focus state, step by step.Guide The modelThe five states of focus.In Flow to Depleted: the framework in one page.Guide The categoryEEG earbuds, explained.What in-ear EEG is and why the ear works.Guide

The five states

One deep dive per state: what it feels like, what the signals show, and what to do next.

New · State 02What locked in actually means.The slang, decoded, then made literal.8 min New · State 03Cognitive overload, explained.Running Hot is the warning. Here is how to catch it early.9 min New · State 04Where your mind goes when it wanders.Drifting is a signal, not a character flaw.9 min New · State 05The afternoon slump, measured.Why your brain fades after 3PM, and what Depleted really means.7 min

The signals

The measurements underneath the states, and what measuring attention honestly looks like.

New · Brain EnergyMental energy is a budget.The battery model: fills overnight, drains with effort, recovers on breaks.7 min New · The bandsAlpha brain waves, without the myths.What alpha actually signals, and why one-band stories oversimplify.9 min New · MeasurementThe attention span test, honestly.What online tests measure, what they miss, and what continuous measurement adds.5 min

Focus, practiced

The habits that protect attention, grounded in what the signals show.

New · AttentionContext switching is expensive.Attention residue, the cost of task jumps, and when switching is right.9 min New · RecoveryBrain breaks that actually work.Break by signal, not by schedule: the five-state break map.6 min

The evidence

An honest look at whether neurofeedback actually works.

EvidenceDoes neurofeedback work?What the evidence says, without the hype.Guide

Read your own focus.

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