While the plates have appeared on other Web sites, it was not until they showed up on the popular Wikipedia site that psychologists became concerned.

“The more test materials are promulgated widely, the more possibility there is to game it,” said Bruce L. Smith, a psychologist and president of the International Society of the Rorschach and Projective Methods, who has posted under the user name SPAdoc. He quickly added that he did not mean that a coached subject could fool the person giving the test into making the wrong diagnosis, but rather “render the results meaningless.”

To psychologists, to render the Rorschach test meaningless would be a particularly painful development because there has been so much research conducted  tens of thousands of papers, by Dr. Smith’s estimate  to try to link a patient’s responses to certain psychological conditions. Yes, new inkblots could be used, these advocates concede, but those blots would not have had the research  “the normative data,” in the language of researchers  that allows the answers to be put into a larger context.

And, more fundamentally, the psychologists object whenever diagnostic tools fall into the hands of amateurs who haven’t been trained to administer them. “Our ethics code that governs the behavior of psychologists talks about maintaining test security,” Steve J. Breckler, the executive director for science at the American Psychological Association, said in an interview. “We wouldn’t be in favor of putting the plates out where anyone can get hold of them.”

Alvin G. Burstein, a professor emeritus of psychology at the University of Tennessee, Knoxville, wrote in an e-mail message that his preference was to have the images removed but that he did not think they would harm the psychological process.

“The process of making sense of one’s experience,” he wrote, “is gratifying. To take Rorschach’s test is to make sense of ambiguity in the context of someone who is interested in how you do that.”

Image In June, Dr. James Heilman posted all 10 plates on the site, along with research about the most popular responses to each.

Trudi Finger, a spokeswoman for Hogrefe & Huber Publishing, the German company that bought an early publisher of Hermann Rorschach’s book, said in an e-mail message last week: “We are assessing legal steps against Wikimedia,” referring to the foundation that runs the Wikipedia sites.