1910s-60s: Behaviourists dominate psychology, criticise introspection for subjectivity and introduce highly controlled lab experiments.
1960s-80s: The cognitive approach reintroduces the scientific study of mental processes (more controlled).
1980s-90s: Biological approach dominates psychology due to advances in technology.
1990s-Present: Cognitive neuroscience dominates psychology due to the development of functional brain scanning techniques like fMRI.