Mind & EverydayMental model
Two gears in your head: one fast, one expensive.
System 1 answers instantly, effortlessly and emotionally; System 2 works slowly, deliberately and costs attention. The model organises many findings but is contested: critics call the split too coarse, since System 2 is also error-prone and fast thinking is often just experience.
Useful: Use it as a question, not a diagnosis: is this my reflex answering, or my spreadsheet?
Source: en.wikipedia.org