Lenore Jacobson
Introduction
Lenore F. Jacobson was an American educator and school psychologist who, with Robert Rosenthal, conducted and published the study that gave psychology the Pygmalion effect. As the principal of an elementary school in South San Francisco, she invited a Harvard psychologist to test whether teachers' beliefs about their pupils could change how those pupils actually performed. Their answer, published in 1966 and expanded into the 1968 book Pygmalion in the Classroom, became one of the most cited and most contested studies in the history of educational research.
Jacobson's place in that story is both central and strangely faint. She initiated the collaboration, supplied the school, delivered the cover story to her own staff and co-wrote the findings, yet the phenomenon is as often called the Rosenthal effect as the Pygmalion effect, and her own life is poorly documented in the reference literature. Recovering her role matters because the study is one of the few canonical experiments in which a practitioner, rather than an academic, was the originating author.
Early Life and Education
Public records of Jacobson's life are thin, and much of what circulates about her in summary sources is unsourced. Reference databases give her birth year as 1922 and place her in California; no reliable obituary or later biographical record appears to have been published, and the commonly repeated details of her family background should be treated with caution.
What is well documented is her training. She earned a Master of Arts degree at California State University, Sacramento in 1951, and completed a doctorate in education at the University of California, Berkeley in 1966, the year after the Pygmalion data were collected. That combination, a practitioner's master's followed by doctoral work while running a school, is characteristic of her career: she moved between school administration and research rather than choosing between them.
Academic and Professional Career
In the early 1960s Jacobson was the principal of Spruce Elementary School in the South San Francisco Unified School District, a school serving many children from low-income Mexican-American families and organised into fast, medium and slow tracks by grade. In 1963 she read an article by Rosenthal in American Scientist on experimenter expectancy effects, in which he noted in passing that a similar self-fulfilling prophecy might operate between teachers and pupils. She wrote to him and offered the use of her school. Rosenthal travelled to San Francisco in 1964, and the two finalised a design.
The study ran in eighteen classrooms spanning grades one through six. All children were given a test presented to teachers as the "Harvard Test of Inflected Acquisition," an impressive-sounding instrument that did not exist; it was in fact the Flanagan Tests of General Ability. Teachers were told that the test predicted which children were about to show an intellectual spurt, and they were given the names of roughly the top fifth of scorers. Those names had been selected at random. Retesting after four and eight months showed gains for every group, but significantly larger gains for the randomly labelled "spurters" in the first and second grades.
Two further findings deserve mention because they shaped later debate. A retest after twenty months, when the children had moved to a new teacher, showed that much of the first and second grade advantage had faded, and the authors also reported that control-group children who improved against expectation tended to be regarded less favourably by their teachers, an observation that anticipated later work on sustaining expectation effects.
The results appeared in Psychological Reports in 1966, in Scientific American in 1968 and, at length, in Pygmalion in the Classroom. Jacobson later became principal of Ponderosa School in the same district, and in 1975 she published with Paul M. Insel a broader treatment of expectancy effects in ordinary life.
Major Contributions to Psychology
The Pygmalion experiment
The design was simple and, for its time, unusually rigorous in one respect: because the "bloomers" were chosen at random, any difference that emerged could not be explained by prior differences in ability. This is what allowed the authors to claim a causal, self-fulfilling effect rather than a correlation between accurate teacher forecasts and later performance. The design received an award from the American Psychological Association before the book appeared.
The interpersonal expectancy effect
Rosenthal and Jacobson argued that expectations are communicated unintentionally, through warmth, attention, the quality of feedback and the number of opportunities offered, and that pupils respond to that differential treatment. The book extended the argument beyond the classroom, connecting it to the older literature on experimenter bias and to the case of Clever Hans, and it concluded with the claim that a person's place in society is substantially a matter of how others treat them.
Self-fulfilling prophecies beyond school
The 1975 book with Insel generalised the idea to medicine, work and personal relationships, presenting the expectancy effect as a general feature of social life rather than a peculiarity of classrooms. It is the part of Jacobson's writing in which her own voice as an educator is most audible, and it reflects her lasting concern that awareness of bias is the first step toward reducing it.
Major Publications
- Rosenthal, R., & Jacobson, L. (1966). Teachers' Expectancies: Determinates of Pupils' IQ Gains. Psychological Reports, 19.
- Rosenthal, R., & Jacobson, L. (1968). Pygmalion in the Classroom: Teacher Expectation and Pupils' Intellectual Development.
- Rosenthal, R., & Jacobson, L. (1968). Teacher Expectations for the Disadvantaged. Scientific American, 218(4).
- Jacobson, L., & Insel, P. M. (1975). What Do You Expect? An Inquiry into Self-Fulfilling Prophecies.
Impact and Legacy
Few studies have been simultaneously so influential and so heavily criticised. The Pygmalion effect entered teacher training, management training and popular culture, and it helped establish teacher expectation as a research field, pursued by Jere Brophy, Thomas Good and later by Lee Jussim and Kent Harber. It also contributed to policy arguments about tracking, labelling and the education of disadvantaged children, and it was cited in court decisions on school desegregation.
The methodological attack began almost immediately. Robert Thorndike, a specialist in educational testing, argued in 1968 that the instrument was so defective that the findings were worthless: in one ordinary class the average reasoning score fell in the retarded range, which he regarded as impossible, and he remarked that when a clock strikes thirteen, doubt falls on every stroke before it. Richard Snow's 1969 review concluded that the study would have been judged unacceptable by an APA journal in its published form, citing a test not normed for the youngest children where the largest gains appeared, problems arising from repeated administration, and reporting that made the data difficult to check. Snow and Janet Elashoff developed the critique in a book-length reanalysis, Pygmalion Reconsidered, in 1971.
The decisive later evidence concerns the size and the fragility of the effect. Sam Wineburg argued in 1987 that the heart of the controversy was the claim about intelligence itself and showed how the political climate of the 1960s had made the finding welcome. Stephen Raudenbush's 1984 meta-analysis of eighteen experiments found a mean effect on IQ of about one tenth of a standard deviation, and showed something more interesting: the effect was moderate when teachers had met their pupils for less than a week but fell to essentially nothing when the expectancy was induced more than two weeks into the year, which is what one would expect if teachers discount information that contradicts what they have already seen.
Two problems in the original data have proved hardest to defend. Snow's 1995 reanalysis reported pretest IQ scores near zero and posttest scores above two hundred among the first and second graders, values that cannot describe real children. Jussim's reviews single out five "bloomers" whose scores moved by implausible margins, including pairs such as 17 to 110 and 133 to 202, and note that when those five cases are excluded the difference between bloomers and controls disappears. Jacobson's defenders reply that implausible pretest scores do not by themselves invalidate the gain measured on the same instrument, and Rosenthal and Rubin's 1978 meta-analysis of several hundred interpersonal expectancy experiments, updated by Rosenthal in 1994, reported an overall effect that was small but reliable. The current consensus is that expectancy effects on teacher behaviour and on some achievement measures are real, that they are small, and that the original claim about raising IQ is not supported.
Two further criticisms concern the study's reception and its ethics. Albert Shanker, then a leading teachers' union figure, objected that the study blamed teachers for failures caused by poverty and under-resourcing, and that reading of the finding spread far beyond what the data licensed; Lee Cronbach is reported to have urged the publisher not to print it at all. On ethics, teachers were deceived about the purpose of the research and children were tested and labelled without consent, and by present standards the study would not receive approval from an institutional review board.
Jacobson's own share of the credit is itself a subject of discussion. She proposed the study and provided the site, yet Rosenthal was first author on both the 1966 report and the 1968 book, was the public face of the work, and absorbed both the fame and the criticism; she is often described as his "collaborator" or as a school principal who assisted him. Contemporary reviewers identified her precisely, crediting her with the doctorate, the school and the practical authority that made the experiment possible. Subsequent scholarship on teacher expectations has largely confirmed that partnership model: practitioner access and academic method produced something neither could have made alone.