He was a cognitive psychologist who rejected a view of learning as an accumulation of responses governed by environmental stimuli in favor of one governed by meaning, intention, and purpose.

A cognitive psychologist might be interested in how the semantic similarity of word pairs in one list affects time to learn on a second list (the transfer task).

He stood out against the popular claims of cognitive psychologists concerning the centrality of non-logical heuristic principles in human cognition.

Cognitive psychologists are delving deeper into these phenomena with promising results.

He has also widely engaged in joint research with computer scientists and philosophers and cognitive psychologists.