What is Psychology?

Psychology resists a single, tidy definition partly because it keeps evolving, and partly because the range of phenomena it studies is too wide to be captured in one sentence. Rather than trying to pin the discipline down once and for all, this section builds up a working definition by unpacking three ideas embedded in it -- mental processes, experience, and behaviour -- and then examines how psychology behaves like a natural science in some of its work and like a social science in the rest. …