Edward C. Tolman

Edward Chace Tolman was born on 14 April 1886 in West Newton, Massachusetts, into a manufacturing family. His older brother Richard Chace Tolman became a noted Caltech physicist, and his mother came from a Quaker background whose ethical seriousness pervaded the household. Family pressure sent Edward to the Massachusetts Institute of Technology, where he received a Bachelor of Science in electrochemistry in 1911. While at MIT he read William James's Principles of Psychology, and the encounter turned him away from physics and chemistry toward philosophy and psychology. James's example of intellectual courage on unpopular questions stayed with Tolman for life. His father had hoped he would take over the family company, but the family ultimately supported the switch. In 1912 he went to Giessen, Germany, and encountered the Gestalt psychologists Kurt Koffka and, later, Kurt Lewin. That European exposure became the intellectual backbone of his career: he would import purpose and cognition into an American behaviorist framework. He transferred to Harvard for graduate work, served in Hugo Munsterberg's laboratory, and took his PhD in 1915.

After three years as an instructor at Northwestern (1915-1918), Tolman moved to the University of California, Berkeley, in 1918, where he remained until his retirement in 1954. He centered his research on maze learning in rats. Against the radical behaviorism of Clark Hull and B.F. Skinner, who treated animals as stimulus-response machines, Tolman insisted that the rat was learning facts about the world that it could later deploy flexibly. He was also a pioneer of behavior genetics, selectively breeding rats by maze performance and showing that maze ability is heritable. His 1932 book Purposive Behavior in Animals and Men proposed a three-tier model of independent, intervening, and dependent variables; its famous dedication reads, To the white rat. The 1938 paper The Determiners of Behavior at a Choice Point developed his intervening-variable scheme — drives, motor skills, and appetites inserted between stimulus and response.

His most influential paper, Cognitive Maps in Rats and Men (1948), reported that rats allowed to explore a maze without reinforcement later navigated it as soon as food appeared — latent learning — and argued that they had built an internal cognitive map of the environment. He distinguished place learning from response learning, showing place-learning rats reached the goal in eight trials while some response-learning animals never learned in 72 trials. This S-S (stimulus-stimulus) framework clashed for decades with Hull's S-R theory. In 1950 Skinner's iconoclastic paper Are theories of learning necessary? swept the field and Tolman's direct influence ebbed. Yet the cognitive map concept resurfaced as a foundation of cognitive psychology, neuroscience, and human geography, and ultimately fed into the decision research that earned Daniel Kahneman a Nobel Prize in 2002.

From 1949 to 1950 the University of California Regents demanded that every faculty member sign a loyalty oath. Tolman refused, not out of any lack of loyalty, but as a defense of academic freedom, and became the leader of dismissed professors who sued in Tolman v. Underhill. In a June 1954 address at McGill University's Special Convocation, he argued that a loyalty oath was in essence an attempt by the state to invade the realm of conscience. The California Supreme Court struck down the oath in 1955, a landmark moment for academic freedom in American higher education. He served as president of the American Psychological Association in 1937 and received its Distinguished Scientific Contribution Award in 1957. He was elected to the American Academy of Arts and Sciences (1949), the National Academy of Sciences, and the American Philosophical Society. In 1963 Berkeley named its newly built Education and Psychology building Tolman Hall in his honor; it was demolished in 2019 for seismic reasons. He was married to Kathleen Drew Tolman, and they had three children. The noted singer-songwriter and music producer Russ Tolman is his grandson. He died on 19 November 1959 at age 73.

Tolman left behind one of the most curious and important legacies in twentieth-century American psychology. He worked entirely within the behaviorist tradition — published in Psychological Review, ran rats through mazes, measured choice times and error counts — and yet built into that tradition an idea, the cognitive map, that would eventually overthrow it. He prepared the ground for the cognitive revolution from inside the behaviorist citadel. His career also stands as an answer to anyone who thinks the modern academy invented its own moral cowardice: in 1949 he picked the fight that most of his colleagues quietly hoped someone else would pick. The eventual Supreme Court reversal of the loyalty oath, the eventual rehabilitation of the dismissed professors, and Berkeley's eventual naming of a building after him were not signs that the system corrects itself easily but a long delayed acknowledgment that the cost of dissent fell almost entirely on him. A 2002 Review of General Psychology survey ranked Tolman as the 45th most cited psychologist of the 20th century, a quiet measure of how thoroughly his cognitive maps and his courage have outlived the radical behaviorism that once dismissed them.