A well-known psychologist in the Netherlands whose work has been published widely in professional journals falsified data and made up entire experiments, an investigating committee has found. Experts say the case exposes deep flaws in the way science is done in a field, psychology, that has only recently earned a fragile respectability. The psychologist, Diederik Stapel, of Tilburg University, committed academic fraud in several dozen" published papers, many accepted in respected journals and reported in the news media, according to a report released ... by the three Dutch institutions where he has worked. The journal Science, which published one of Dr. Stapel's papers in April, posted an "editorial expression of concern" about the research online. The scandal, involving about a decade of work, is the latest in a string of embarrassments in a field that critics and statisticians say badly needs to overhaul how it treats research results. In recent years, psychologists have reported a raft of findings on race biases, brain imaging and even extrasensory perception that have not stood up to scrutiny. Outright fraud may be rare, these experts say, but they contend that Dr. Stapel took advantage of a system that allows researchers to operate in near secrecy and massage data to find what they want to find, without much fear of being challenged.