How is logic different from psychology?

In the philosophy of logic, the distinction between logic and psychology is fundamental. While psychology is an empirical science that studies the observable regularities and processes of actual human thinking, logic is concerned with the laws of correct reasoning.1

The primary differences include:

• Nature of Laws: The laws of logic are not empirical generalizations derived from observing how people think. Instead, they are independent of the psychological idiosyncrasies of any individual thinker.1
• Independence from Fact: Logical truths are based entirely on the meanings of the terms they contain and hold independently of contingent matters of fact or what a person happens to believe.1
• Focus: Psychology investigates the development and nature of mental processes, such as how children master logical structures. In contrast, logic focuses on valid argumentation and the essential structures of truth.231

Historically, the view that psychology could serve as a foundation for logic—known as psychologism—was famously challenged by philosophers like Gottlob Frege and Edmund Husserl, who argued that logic must remain distinct from the study of psychic acts.43