'4' arrives instantly (System 1); the multiplication needs effortful System 2.
Driving on autopilot
A familiar route runs on System 1, freeing your mind to wander.
A gut first impression
Liking or distrusting someone in a second is System 1; reconsidering it is System 2.
Reading an angry face
Registered instantly, with no effort at all — pure System 1.
Catching your own bias
Slowing down to question a snap judgment is System 2 overriding System 1 — exactly when good decisions happen.
How to spot it in yourself
Before any decision that feels instantly obvious, pause and ask "is this System 1 talking?" — strong, fast certainty is exactly when a slow second look pays off.
For important choices, deliberately slow down: write the options out, sleep on it, or explain your reasoning to someone — that forces System 2 online.
Notice physical cues of System 1 (snap judgments, gut reactions to people) and treat them as hypotheses to check, not conclusions to act on.
You'll forget most of this by next week.
That's just how memory works. Lock system 1 and system 2 in with a 5-minute active-recall session — spaced repetition, no signup.