How the Mind Works
Discover the hidden machinery behind your attention, memory, and everyday decisions. Learn why your brain cuts corners, distorts the past, and handles cognitive overload.
Like Duolingo, but for How the Mind Works. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through How You Filter and Hold Information and How Your Brain Fills in the Blanks. It starts from scratch.
Free forever · No credit card · iPhone & Android

Key ideas in How the Mind Works
- Attention works by actively damping down background signals rather than capturing everything equally
- Conscious focus has a narrow bandwidth that requires tuning out competing sensory input
- Unattended auditory streams are still processed at an automatic, pre-conscious level
- Salient cues like your own name can break through the sensory filter into conscious awareness
- Multitasking is sequential task-switching rather than parallel processing
- Switching requires mental overhead to turn off old rules and activate new ones
- A mental hangover or attention residue temporarily drags down performance on the new task
- When mental effort is fully devoted to counting passes, unattended visual data is discarded before conscious awareness
- Looking directly at an object does not guarantee conscious seeing if attention is occupied elsewhere
- Working memory can reliably hold only about four unrelated items at once
- New incoming items bump existing items out of conscious focus rather than expanding storage capacity
- Chunking groups disconnected pieces of data into a single meaningful pattern drawn from long-term memory
- A chunk occupies only one of your four working memory slots regardless of how many individual characters it contains
- The mind splits visual images and spoken words into separate processing streams
- Using a visual channel alongside a verbal channel lets you take in more information simultaneously without mutual interference
- Repeating a phrase on a loop only resets a short decay timer without locking the memory in
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives How the Mind Works the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
When you read in a noisy room, what does your attentional spotlight do to background noise?
Get it right to open this lesson and 10 more in the app.
Where How the Mind Works takes you
- 1
How You Filter and Hold Information
- Directing Your Attention Spotlight
- Working Memory and the Chunking Trick
- 2
How Your Brain Fills in the Blanks
- Remembering by Rebuilding, Not Replaying
- Fast Thinking and Everyday Shortcuts
2 sections · 4 units · 11 levels. Built to play, not to enroll.
You pick the voice
How the Mind Works is taught in the Explain Like I'm 5 style: no big words. promise.. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start How the Mind Works today.
Download Tomo, search How the Mind Works, and play your first lesson in under a minute.