The Discipline of System 2

This flow follows the struggle between automatic impulses and deliberate control, from attention experiments to self-regulation.

increasingBearing stren­gth in each eventdecreasing

Multiplication Demand

Seventeen Times Twenty-Four Mental Work The multiplication problem recruits memory, attention, and sequential calculation. Bodily Cost Dilated pupils and increased heart rate reveal that slow thinking consumes effort.

Attention Competition

A Limited Budget Divided Tasks Dense traffic and mental arithmetic cannot safely share the same attentional resources. Selective Allocation System 2 protects the most important task while neglecting secondary stimuli.

The Invisible Gorilla

Blind to the Obvious Counting Passes Observers focus so intensely on basketball passes that many miss a gorilla crossing the court. Blindness to Blindness Their confidence that nothing was missed becomes part of the lesson.

Ego Depletion

Weakened Control Successive Effort Self-control, emotional suppression, and demanding cognition draw on overlapping resources. Temptation When System 2 is busy or depleted, impulsive choices become more likely.

The Lazy Controller

Effort Avoided Natural Speed System 2 prefers a comfortable stroll to a mental sprint. Necessary Resistance Good reasoning requires deliberate effort precisely when intuition feels most satisfying.

At the opening of Part 1

Early in the attention chapter

During the discussion of attention blindness

In the chapter on the lazy controller

Near the end of Part 1