The research layer
The science behind the cards
Every strategy in The Brain Deck is built on research in cognitive and behavioral psychology. Here's the map — one principle at a time, grouped by the five feelings the deck addresses, each linked to the paper itself. Where a famous finding has replicated poorly, we say so.
How to read this page
I Can't Start
For when the task exists but your body won't move.
Open loops (the Zeigarnik effect)
Bluma Zeigarnik, 1927 · Masicampo & Baumeister, 2011
Zeigarnik's famous memory advantage for unfinished tasks replicates poorly. The useful part holds up: an unfinished goal keeps intruding on other work, and writing a specific plan for it stops the intrusions.
Read the source →Tiny Habits
Dr. BJ Fogg, Stanford Behavior Design Lab
Fogg's model: a behavior happens when motivation, ability and a prompt come together. Make the action tiny enough and it still happens on a low-motivation day.
Read the source →The Progress Principle
Amabile & Kramer, Harvard Business School (2011)
Across nearly 12,000 daily diary entries from 238 knowledge workers, making progress on meaningful work was the biggest booster of motivation on a given day.
Read the source →Social facilitation / body doubling
Robert Zajonc, 1965 (Science)
Having others present tends to help on simple, well-practiced tasks and hurt on new, complex ones. Body doubling builds on this idea but has little direct research yet, so try it on routine work first.
Read the source →Lost Time
For when you blinked and three hours disappeared.
The Planning Fallacy
Kahneman & Tversky, 1979 · Buehler, Griffin & Ross, 1994
People predict their own tasks will finish sooner than they do, even when they know similar tasks ran late before. Logging predictions vs. actuals is the cheapest correction.
Read the source →Time blindness
Dr. Russell Barkley · Marx et al., 2022 meta-analysis
People with ADHD show measurably altered time perception on average. Visual timers make the passage of time something you can see rather than estimate.
Read the source →Parkinson's Law (tight containers)
Cyril Northcote Parkinson, 1955 (an essay, not an experiment)
Work expands to fill the time available. It began as satire about bureaucracy; short, visible containers (10–25 minutes) are the practical takeaway.
Can't Decide
For when every option feels equally impossible.
Decision fatigue (contested)
Roy Baumeister · Hagger et al., 2016 replication
The ego-depletion idea says self-control runs on a limited resource. A preregistered replication across 23 labs found an effect close to zero, so treat it as a hypothesis. Cutting trivial daily decisions is still sensible housekeeping.
Read the source →Satisficing beats maximizing
Herbert Simon (concept) · Schwartz et al., 2002 (data)
People who settle for the first option that meets their bar report more happiness and less regret than 'maximizers' who keep hunting for the best.
Read the source →Regrets of inaction
Gilovich & Medvec, Cornell (1995)
In the short run people regret actions more; over the long run they regret the things they didn't do. When two options are close, choosing one, even by coin flip, usually costs less than not choosing.
Read the source →Overwhelmed
For when the world is too loud, too bright, too everything.
Cognitive load theory
John Sweller, 1988 · capacity: Nelson Cowan, 2001
Working memory holds roughly four chunks at once. Externalizing tasks to paper frees up the budget needed to act on any one of them.
Read the source →Choice overload
Barry Schwartz · Scheibehenne et al., 2010 meta-analysis
Big menus can stall a decision, but across 50 experiments the average choice-overload effect was close to zero: it depends on the situation. A short list is still the cheap fix when you are already stuck.
Read the source →Attention restoration
Stephen Kaplan, University of Michigan (1995)
Directed attention tires with use, and settings that hold attention effortlessly, nature above all, help it recover. A short walk outside is the deck's version.
Read the source →Fell Off Track
For when you missed a day and your brain says give up forever.
The Fresh Start Effect
Dai, Milkman & Riis, Wharton (2014)
Temporal landmarks (a new week, month or birthday) make people more likely to start aspirational behaviors. Framing your own restart as a new beginning is the practical takeaway.
Read the source →Self-forgiveness reduces repeat procrastination
Wohl, Pychyl & Bennett, Carleton University (2010)
Students who forgave themselves for procrastinating before a first exam felt less negative and procrastinated less before the next one. Guilt keeps the cycle going; forgiving the slip helps break it.
Read the source →The what-the-hell effect
Herman & Polivy, University of Toronto
Dieters who believed they had already blown the diet often ate more, not less. A single broken streak can trigger the same collapse; a low-bar re-entry ('just show up') interrupts it.
Put the research on your desk
A research paper you can hold
Every principle above ships as a card you can pull in the moment you need it — with the action on the front and the science on the back.
Pull a sample card