Thinking Fast Vs. Thinking Slow
System 1 Vs. System 2 Thinking
The notion that there is a dichotomy between two "modes" of thought: ‘System 1' representing the fast, instinctive and emotional, where ‘System 2' is slower, more deliberative, and more logical.
EverydayConcepts.io
Reference entry — no illustration yet
Origin
Popularized by economist Daniel Kahneman in his 2011 book, "Thinking, Fast and Slow".