A Powerful Identity, a Vanishing Diagnosis ( 2 )

A Powerful Identity, a Vanishing Diagnosis ( 2 ). A big challenge for the diagnostic manual team working on autism is how to measure severity in a condition that often causes a very uneven profile of abilities and disabilities. Mr. Grossman gives the example of a woman who serves on an advisory panel to his organization. She is nonverbal and depends on an electronic device to communicate, is prone to self-injury and relies on a personal aide. And yet “she’s absolutely brilliant, she runs a newsletter, and she’s up on all the science,” he said, adding, “Where would somebody like that come out on the rating scale?”

Recent books by people with Asperger’s give insights into the workings of some oddly beautiful minds. In “Embracing the Wide Sky” (Free Press, 2009), Daniel Tammet, a shy British math and linguistic savant, tells how he was able to learn enough Icelandic in a week to manage a television interview and how he could recite the value of pi to 22,514 decimal places by envisioning the digits “as a rolling numerical panorama” of colors, shapes and textures.

In “Look Me in the Eye” (Crown, 2007), John Elder Robison describes a painfully lonely childhood and an ability to look at a circuit design and imagine how it will transform sound — a talent he used to invent audio effects and exploding guitars for the rock band Kiss.

Not all people with Asperger’s have such extraordinary abilities, and some who do are so crippled by anxiety and social limitations that they cannot hold down a job or live on their own.

Dr. Susan E. Swedo, a senior investigator at the National Institute of Mental Health who heads the diagnostic manual group working on autism, acknowledges the difficulty of describing such a variable disorder. Dr. Swedo said the plan was to define autism by two core elements — impaired social communication and repetitive behaviors or fixated interests — and to score each of those elements for severity.

The trick is to “walk the tightrope of truth,” Dr. Swedo said, between providing clear, easily used diagnostic guidance to clinicians and capturing the individual variation that is relevant to treatment. “People say that in autism, everybody is a snowflake,” she said. “It’s the perfect analogy.”

The proposed elimination of autism subtypes comes at the very moment when research suggests that the disorder may have scores of varieties. Investigators have already identified more than a dozen gene patterns associated with autism, but Dr. Lord, of Michigan, said the genetic markers “don’t seem to map at all into what people currently call Asperger’s or P.D.D.”

Nor have many of these genes been linked to distinct sets of symptoms. Until research can identify reliable biological markers for autism subtypes, Dr. Lord and other experts say, it is better to have no subtypes than the wrong ones.

In interviews, people with Asperger’s and mild autism were divided on the prospect of losing the label. Temple Grandin, a Colorado State University animal scientist who is perhaps the best-known autistic American, said Asperger’s was too well established to be thrown overboard. “The Asperger community is a big vocal community,” Dr. Grandin said, “a reason in itself” to leave the diagnosis in place.

“P.D.D.-N.O.S., I’d throw in the garbage can,” she added. “But I’d keep Asperger’s.”

But some younger people involved in the growing autism self-advocacy movement see things differently.

“My identity is attached to being on the autism spectrum, not some superior Asperger’s identity,” said Ari Ne’eman, 21, an activist who founded the Autistic Self-Advocacy Network, a 15-chapter organization he has built while in college, adding, “I think the consolidation to one category of autism spectrum diagnosis will lead to better services.”

All interested parties will have an opportunity to weigh in on the proposed changes. The American Psychiatric Association is expected to post the working group’s final proposal on autism diagnostic criteria on the diagnostic manual’s Web site in January and invite comment from the public. Dr. Swedo and company are bracing for an earful. nytimes.com

This article has been revised to reflect the following correction: Correction: November 5, 2009

An article on Tuesday about a proposal to remove Asperger’s syndrome from the next edition of psychiatry’s diagnostic manual misstated the educational affiliation for Temple Grandin, a well-known American with autism. She is a professor of animal science at Colorado State University, not the University of Colorado.