“Her seminal feature integration theory,” he continued, “proposed that selective attention to an object or location enabled the binding of those features and, thus, enabled object recognition. Much argument has followed, but her formulation of the problem has shaped the field for almost four decades.”
Dr. Treisman did not merely theorize about how perception works; she tested her ideas with countless experiments in which subjects were asked, for instance, to pick a particular letter out of a visual field, or to identify black digits and colored letters flashing by. The work showed not only how we perceive, but also how we can sometimes misperceive.
Her studies also included neurological disorders like Balint syndrome, in which damage to the parietal lobes of the brain limits what is seen in a field of vision or otherwise disrupts perception. Her insights into how the brain interprets have also had practical implications.
“Applied psychological scientists have relied on her work to help improve operations ranging from traffic signal design to airport baggage inspection,” the Association for Psychological Science wrote in an online memorial.
The phenomena she examined are experienced by people every day, though they don’t realize it.
“Anne Treisman’s major contribution was to show that basic visual properties like color and motion can be perceived over the whole visual field at once, but combinations of these properties can only be correctly perceived by inspecting each object in turn,” said Nancy Kanwisher, a professor of cognitive neuroscience at the Massachusetts Institute of Technology who did her postdoctoral work under Dr. Treisman. “This is why the red can opener ‘pops out’ in your kitchen utensil drawer, but the stainless steel fruit peeler does not.”
The Association for Psychological Science called Dr. Treisman “one of the world’s most influential cognitive psychologists.” But her career could easily have gone in an entirely different direction.
Anne Marie Taylor was born on Feb. 27, 1935, in Wakefield, England. Her father, Percy, an education administrator, was British, but her mother, the former Suzanne Touren, was French, and young Anne learned French before she learned English.
The family was living in Kent, southeast of London, when World War II broke out.
“Our house was right in the path of the V-1 flying bombs heading for London — doodlebugs, as they were called,” Dr. Treisman wrote in an autobiographical sketch. “My sister and I would always include a doodlebug in the sky in the pictures we drew.”
At the time, she wrote, when students hit 15 they were required to narrow their studies to three subjects. She initially chose the sciences, but her father persuaded her to switch to French, Latin and history. That focus persisted when she was admitted to Cambridge University; her first degree, earned in 1956, was in modern and medieval languages.
“I applied for a job teaching French at Oxford High School,” she said. “Luckily, I was turned down, perhaps because I did not know what the letters GPDST stood for (Girls Public Day School Trust — a select association of girls’ high schools). If I had known that acronym I might have had a very different life.”
Cambridge offered her a research fellowship in French literature, but she took the unusual step of asking if the money could instead be put toward a second undergraduate degree, this one in psychology. She received that in 1957 and her doctorate in psychology at Oxford in 1962.
Working in the Medical Research Council’s Psycholinguistics Research Unit at Oxford, she studied how the brain receives and interprets auditory signals. In 1966, she and her husband, Michel Treisman, whom she had married in 1960 when both were graduate students, spent a year as visiting scientists at Bell Labs in New Jersey, and she became interested in visual perception as well.
That subject came to dominate her work, which she continued as a researcher and professor at the University of British Columbia; the University of California, Berkeley; and several other stops, the last of which was Princeton University, where she was a professor from 1993 until her retirement in 2010.
Dr. Treisman’s first marriage ended in divorce in 1976. In 1978 she married Daniel Kahneman, a psychologist who in 2002 would share the Nobel Memorial Prize in Economic Sciences with Vernon L. Smith, and who survives her. In addition to him and her daughter Deborah, she is survived by her sons, Daniel and Stephen; another daughter, Jessica Treisman; and four granddaughters.
In 2013 Dr. Treisman received the National Medal of Science from President Barack Obama “for a 50-year career of penetrating originality and depth that has led to the understanding of fundamental attentional limits in the human mind and brain.”
Despite her accomplishments, Dr. Treisman was no aloof academic, as those who worked with and under her knew.
“Anne also had a wry sense of humor that was all the more delightful coming from this otherwise reserved and gracious giant of the field,” Dr. Kanwisher said. “I remember us ‘kids’ in the lab worrying about the latest attack on feature integration theory, and Anne just responding with a mischievous grin and a sparkle in her eye, saying, ‘Here we go again!’ ”