Clark L. Hull
Behavior as an equation of drive, habit and reinforcement.
American behaviorist who built a formal, mathematical theory of learning and motivation.
Behavior can be modeled as the interaction of drive, habit and reinforcement.
Who they were
Clark Hull wanted psychology to be as precise as physics. He modeled behavior with equations, treating it as the product of drive, habit strength and reinforcement. Though later thinkers softened his rigid formalism, his insistence on testable, measurable theory shaped a generation of learning research.
Famous books
What they left on the shelf
Terms they cared about
Ideas worth knowing
Their techniques
How the work was done
Best known as a theorist — their ideas shaped the techniques of those who followed.
Their big idea
Drive-Reduction Theory
Clark Hull held that organisms act to reduce internal drives created by unmet needs, and that behavior followed by drive reduction is reinforced. He cast this as a precise, hypothetico-deductive system meant to predict behavior from measurable variables.
Questions in their spirit
What they’d ask you
Sit with one. Answer online, or in the app.
Carry the idea forward
Hull — What they’d ask you
Psipas asks you one small, honest question at a time — and builds the picture from your answers.