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The Mind

Psychology and neuroscience that holds up — and honesty about what didn’t.

1 chapterupdated July 2026sources linked in every chapter

The story so far

The mind is only recently an open book. Neuroscience has mapped how memory stabilizes, how sleep consolidates learning, and how attention works — but the field also carries a reckoning: many celebrated psychology findings failed to replicate at scale. This book sticks to what holds up under replication, and is honest about what remains contested.

Chapter one covers memory, sleep, and the replication crisis that reshaped the field.

Chapter 1 · July 2026

How we know what we know: memory, sleep, and the replication crisis

Memory: stable, then fragile, then stable again

Recalling a memory can briefly destabilize it, requiring the brain to re-store it — a process called reconsolidation, robust in animal studies and promising but less certain in humans.

Nature
The spacing effect — learning sticks better when practice is spread over time — is one of psychology's most durable findings, though recent work shows its size varies a lot by subject.
Springer

Sleep: the brain's nightly replay

During deep sleep, coordinated slow oscillations, spindles and hippocampal ripples replay the day's experiences and move them into long-term storage — a mechanism established across animal and human recordings.

NCBI

The replication crisis

Large preregistered studies dismantled once-famous effects: 'ego depletion' (that willpower is a depletable fuel) shrank to near zero in replications of thousands of participants, and 'social priming' effects largely vanished when independent teams ran them.

Sage
The lesson wasn't that psychology is worthless, but that publication bias and small samples had inflated the record.

The open questions

Does commercial brain training improve everyday thinking?

Some transferTraining on cognitive tasks can improve those tasks and, some studies argue, related abilities like working memory. Nature
Little or noneLarge preregistered work finds gains stay narrowly on the trained task, with little transfer to real-world cognition. APA

A living book: chapters are dated and grow as the story develops. Nothing is deleted — the record just gets longer.