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Tero Toivanen

Facilitated communication: Facts, Discussion Forum, and Encyclopedia Article - 1 views

  • The procedure is controversial, since a majority of peer reviewPeer reviewPeer review is the process of subjecting an author's scholarly work, research, or ideas to the scrutiny of others who are experts in the same field. Peer review requires a community of experts in a given field, who are qualified and able to perform impartial review...ed scientific studies conclude that the typed language output attributed to the clients is directed or systematically determined by the therapists who provide facilitated assistance. Some peer-reviewed scientific studies have indicated instances of valid FC, and some FC users have reportedly gone on to type independently.
  • Harvard UniversityHarvard UniversityHarvard University is a private university located in Cambridge, Massachusetts and a member of the Ivy League. Founded in 1636 by the colonial Massachusetts legislature, Harvard is the oldest institution of higher learning in the United States and currently comprises ten separate academic units... psychologist Daniel WegnerDaniel WegnerDaniel M. Wegner is an American social psychologist. He is a professor of psychology at Harvard University and a fellow of the American Association for the Advancement of Science. He is known for his work on mental control and conscious will, and for originating the study of transactive memory and... has argued that facilitated communication is a striking example of the ideomotor effectIdeomotor effectThe ideomotor effect is a psychological phenomenon wherein a subject makes motions unconsciously. As in reflexive responses to pain, the body sometimes reacts reflexively to ideas alone without the person consciously deciding to take action..., the well-known phenomenon whereby individuals' expectations exert unconscious influence over their motor actions. Even FC users and proponents do acknowledge the possibility of facilitators at times "guiding" users, consciously or unconsciously. Other theorists (Donnellan and Leary, 1995) argue that autism is in significant part characterized by dyspraxia (a movement disorder), and that there exists a synchronistic "dance" to communication in all mammalian social interaction which accounts for the mixed results in validation studies.
  • Stephen von Tetzchner, the author of another leading textbook on Augmentative and Alternative CommunicationAugmentative and alternative communicationAugmentative and alternative communication is communication for those with impairments or restrictions on the production or comprehension of spoken or written language.-Definition :... has done theoretical research about facilitated communication. In his opinion "The existing evidence clearly demonstrates that facilitating techniques usually led to automatic writingAutomatic writingAutomatic writing is the process or production of writing material that does not come from the conscious thoughts of the writer. Practitioners say that the writer's hand forms the message, with the person being unaware of what will be written...., displaying the thoughts and the attitudes of the facilitators."
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  • Mark Mostert (2001) says: "Previous reviews of Facilitated Communication (FC) studies have clearly established that proponents' claims are largely unsubstantiated and that using FC as an intervention for communicatively impaired or noncommunicative individuals is not recommended." In March 2007, Scott Lilienfeld included facilitated communication on a list of treatments that have the potential to cause harm in clients, published in the APSAssociation for Psychological ScienceThe Association for Psychological Science , previously the American Psychological Society, is a non-profit organization whose mission is to promote, protect, and advance the interests of scientifically oriented psychology in research, application, teaching, and the improvement of human welfare... journal Perspectives on Psychological Science.
  • The phrase "independent typing" is defined by supporters of FC as "typing without physical support", i.e., without being touched by another person. Skeptics of FC do not agree that this definition of independence suffices because of the possibility of influence by the facilitator. For example, Sue RubinSue RubinSue Rubin is a functionally non-verbal published autistic author who was the subject of the Oscar-nominated documentary Autism Is A World in which she communicated via the controversial communication technique of facilitated communication...., an FC user featured in the autobiographical documentary Autism Is A World, reportedly types without anyone touching her; however, she reports that she requires a facilitator to hold the keyboard and offer other assistance.
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    The procedure is controversial, since a majority of peer reviewed scientific studies conclude that the typed language output attributed to the clients is directed or systematically determined by the therapists who provide facilitated assistance. Some peer-reviewed scientific studies have indicated instances of valid FC, and some FC users have reportedly gone on to type independently.
Tero Toivanen

Autism Therapy: pivotal response training | Healing Thresholds - 0 views

  • Future research may allow therapists to know in advance which type of applied behavior analysis (ABA therapy) is most likely to work for any given child with autism.
  • This study of six children was designed to see if it is possible to predict which type of ABA therapy will work for which child with autism.
  • The authors were able to predict which children would respond to pivotal response training, but not which ones would respond to discrete trial training. The authors note that all children were first exposed to pivotal response training and then to discrete trial training and this may have influenced the results. Children who liked toys were more likely to respond to pivotal response training than children who did not like toys.
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  • This study looked at whether or not a type of applied behavior analysis (pivotal response training) could be used to teach play skills to children with autism.
  • . Both children in the study improved their social skills during recess time.
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    Type of training in which certain behaviors are assumed to be crucial for other behaviors. These pivotal behaviors are then targeted so that the behaviors that depend upon them can change as well.
Tero Toivanen

Asperger Syndrome Tied to Low Cortisol Levels - 0 views

  • Low levels of a stress hormone may be responsible for the obsession with routine and dislike for new experiences common in children with a certain type of autism.
  • The body produces cortisol, among other hormones, in stressful situations. Cortisol increases blood pressure and blood sugar levels, among other duties, to signal the body's need to adapt to changes occurring around it.
  • People with Asperger syndrome notably have very repetitive or narrow patterns of thought and behavior, such as being obsessed with either a single object or topic. Though tending to become experts in this limited domain, they have otherwise very limited social skills, according to the study.
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  • "Although these are early days, we think this difference in stress hormone levels could be really significant in explaining why children with AS are less able to react and cope with unexpected change,"
  • If these Asperger symptoms are caused primarily by stress, caregivers could learn to steer children away from situations that would add to anxiety, the researchers said.
  • "This study suggests that children with AS may not adjust normally to the challenge of a new environment on waking,"
  • The researchers, whose findings were published in the journal Psychoneuroendocrinology, will next study if this lack of cortisol upon waking also occurs in children with other types of autism.
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    Low levels of a stress hormone may be responsible for the obsession with routine and dislike for new experiences common in children with a certain type of autism.
Tero Toivanen

Autism finding could lead to simple urine test for the condition - 0 views

  • The researchers behind the study, from Imperial College London and the University of South Australia, suggest that their findings could ultimately lead to a simple urine test to determine whether or not a young child has autism.
  • People with autism are also known to suffer from gastrointestinal disorders and they have a different makeup of bacteria in their guts from non-autistic people.
  • Today's research shows that it is possible to distinguish between autistic and non-autistic children by looking at the by-products of gut bacteria and the body's metabolic processes in the children's urine. The exact biological significance of gastrointestinal disorders in the development of autism is unknown.
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  • The distinctive urinary metabolic fingerprint for autism identified in today's study could form the basis of a non-invasive test that might help diagnose autism earlier. This would enable autistic children to receive assistance, such as advanced behavioural therapy, earlier in their development than is currently possible.
  • The researchers suggest that their new understanding of the makeup of bacteria in autistic children's guts could also help scientists to develop treatments to tackle autistic people's gastrointestinal problems.
  • Professor Jeremy Nicholson, the corresponding author of the study, who is the Head of the Department of Surgery and Cancer at Imperial College London, said: "Autism is a condition that affects a person's social skills, so at first it might seem strange that there's a relationship between autism and what's happening in someone's gut. However, your metabolism and the makeup of your gut bacteria reflect all sorts of things, including your lifestyle and your genes. Autism affects many different parts of a person's system and our study shows that you can see how it disrupts their system by looking at their metabolism and their gut bacteria.
  • We hope our findings might be the first step towards creating a simple urine test to diagnose autism at a really young age
  • A urine test might enable professionals to quickly identify children with autism and help them early on," he added.
  • The researchers reached their conclusions by using H NMR Spectroscopy to analyse the urine of three groups of children aged between 3 and 9: 39 children who had previously been diagnosed with autism, 28 non-autistic siblings of children with autism, and 34 children who did not have autism who did not have an autistic sibling. They found that each of the three groups had a distinct chemical fingerprint. Non-autistic children with autistic siblings had a different chemical fingerprint than those without any autistic siblings, and autistic children had a different chemical fingerprint than the other two groups.
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    This is interesting finding. Hope it will give results!
Amanda Kenuam

Looking Through the Lens - Special Education Photography Class - 0 views

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    "special needs, students, technology, class, teachers, photography"
Tero Toivanen

Facing Autism in New Brunswick: Autism Diagnoses: DSM V Should Separate Autistic Disord... - 0 views

  • This inclusion of substantially different disorders, with wildly different challenges, in one "spectrum" of disorders implies that the very serious challenges of persons with Autistic Disorder who lack a fundamental understanding of the world, who have very limited abstract thought and who have very little in the way of communication skills are somehow fundamentally similar to persons with good to excellent facilities in all these crucial areas of life.
  • Research is resulting in more and more people describing autism in the plural as autism disorders with different causes and different possible treatments.
  • It is time for the DSM to get realistic about the Autism "Spectrum".
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  • It is time to merge High Functioning autism disorders with Aspergers Disorder and separate them from Autistic Disorder.
  • It is time for the DSM to recognize the importance of levels of ability to function in and understand the world and to reflect those levels in their classification of development disorders.
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    It is time to merge High Functioning autism disorders with Aspergers Disorder and separate them from Autistic Disorder.
Tero Toivanen

An Outbreak of Autism, or a Statistical Fluke? - NYTimes.com - 0 views

  • A former Minneapolis school official said Somalis made up 25 percent of children in preschool classes for those with severe autism.
  • Since the cause of autism is unknown, the authorities in Minnesota say it is hard to know even what to investigate.
  • A small recent study of refugees in schools in Stockholm found that Somalis were in classes for autistic children at three times the normal rate.
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  • Antivaccine activists are campaigning among them, which worries public health officials, especially because some families go back and forth to Somalia, where measles is still a significant cause of childhood death, according to Unicef.
  • Last year, she said, 25 percent of the children in preschool classes offering the most intensive treatment had Somali parents, while only about 6 percent of public school enrollment is Somali. Dr. Daniel S. McLellan, a pediatrician, said that when he began practicing at Children’s Hospital six years ago, he was struck by how many autistic Somali children he saw.
Amanda Kenuam

Moving Towards Physical Special Education - 0 views

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    "special education, special needs, school, class, physical education"
Tero Toivanen

Pivotal Response Teaching - 0 views

  • Pivotal Response Teaching  is an Advanced Behavioral Treatment intervention based on the principles of Applied Behavior Analysis (ABA) and derived from the work of Drs. Koegel, Schreibman, Dunlap, Horner, Burke and other researchers.
  • PRT builds upon the older ABA paradigms and has a focus on targeting “Pivotal” skills or behaviors in order to produce more broad changes in a child’s development.
  • Pivotal Response Training (PRT) provides a guideline for teaching skills and has been most successful for language, play and social interaction skills in children with autism and related disorders. 
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    Pivotal Response Teaching is an Advanced Behavioral Treatment intervention based on the principles of Applied Behavior Analysis (ABA) and derived from the work of Drs. Koegel, Schreibman, Dunlap, Horner, Burke and other researchers.
Tero Toivanen

Magnetic stimulation helps researchers trigger responses in autistic brain - The Boston... - 0 views

  • Now a small but growing number of researchers see hope in a tool called transcranial magnetic stimulation, which lets scientists spark activity in specific areas of the brain and watch what happens to patients' behavior. The technology may illuminate some of the biology behind the disease, and some specialists speculate it may one day offer a treatment.
  • John Gabrieli, a neuroscientist at Massachusetts Institute of Technology. Transcranial magnetic stimulation "is fantastic for identifying brain regions that are essential for specific mental functions. . . . I think if we can start to use it more systematically with autism, one could hope we'd understand a lot more about what's going on."
  • Researchers at the Boston hospital's Berenson-Allen Center for Noninvasive Brain Stimulation used rapid, repetitive stimulation to simulate what happens in the brain when people learn a new task. Then they gave a single pulse of stimulation and measured minute muscle twitches that told them how long people's brains maintained connections formed by the initial stimulation.In people with no evidence of autism, changes lasted about 30 minutes, on average. But in people on the autism spectrum, the initial stimulation caused brain changes that lasted much longer - on average an hour and a half.
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    Now a small but growing number of researchers see hope in a tool called transcranial magnetic stimulation, which lets scientists spark activity in specific areas of the brain and watch what happens to patients' behavior. The technology may illuminate some of the biology behind the disease, and some specialists speculate it may one day offer a treatment.
Tero Toivanen

News from the Associated Press - newsjournalonline.com - 0 views

  • Leo Lytel was diagnosed with autism as a toddler. But by age 9 he had overcome the disorder. His progress is part of a growing body of research that suggests at least 10 percent of children with autism can "recover" from it - most of them after undergoing years of intensive behavioral therapy.
  • She presented research this week at an autism conference in Chicago that included 20 children who, according to rigorous analysis, got a correct diagnosis but years later were no longer considered autistic.
  • Skeptics question the phenomenon, but University of Connecticut psychology professor Deborah Fein is among those convinced it's real.
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  • Previous studies have suggested between 3 percent and 25 percent of autistic kids recover. Fein says her studies have shown the range is 10 percent to 20 percent.
  • But even after lots of therapy - often carefully designed educational and social activities with rewards - most autistic children remain autistic. Recovery is "not a realistic expectation for the majority of kids," but parents should know it can happen, Fein said.
  • The children in Fein's study, which is still ongoing, were diagnosed by an autism specialist before age 5 but no longer meet diagnostic criteria for autism. The initial diagnoses were verified through early medical records.
  • The researchers are also doing imaging tests to see if the recovered kids' brains look more like those of autistic or nonautistic children.
  • Imaging scans also are being done to examine brain function in formerly autistic kids.
  • Results from those tests are still being analyzed.
  • Most of the formerly autistic kids got long-term behavior treatment soon after diagnosis, in some cases for 30 or 40 hours weekly.
  • Many also have above-average IQs and had been diagnosed with relatively mild cases of autism. At age 2, many were within the normal range for motor development, able to walk, climb and hold a pencil.
  • Significant improvement suggesting recovery was evident by around age 7 in most cases, Fein said.
  • None of the children has shown any sign of relapse. But nearly three-fourths of the formerly autistic kids have had other disorders, including attention-deficit problems, tics and phobias; eight still are affected.
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    Leo Lytel was diagnosed with autism as a toddler. But by age 9 he had overcome the disorder. His progress is part of a growing body of research that suggests at least 10 percent of children with autism can "recover" from it - most of them after undergoing years of intensive behavioral therapy.
J B

Wii for Inclusive Physical Education - 0 views

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    PLEASE VOTE for my grant to benefit inclusion PE classes!!
Child Therapy

Developing Self Confidence In Children - 1 views

My husband and I were really worried with the indifference that our second child has been showing. We noticed that she did not like to mingle with other kids in the class. Her teacher even told us ...

started by Child Therapy on 29 Nov 12 no follow-up yet
Tero Toivanen

Autism Research Blog: Translating Autism: Eyes aversion in autism may affect face recog... - 0 views

  • A brief review of Annaz, D., Karmiloff-Smith, A., Johnson, M., & Thomas, M. (2009). A cross-syndrome study of the development of holistic face recognition in children with autism, Down syndrome, and Williams syndrome Journal of Experimental Child Psychology, 102 (4), 456-486 DOI: 10.1016/j.jecp.2008.11.005
  • 33 kids with autism
  • 15 children with Williams syndrome
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  • 15 children with down’s syndrome
  • 25 typically developing children
  • The authors found that all three diagnostic groups showed anomalies in the development of face recognition when compared to typically developing kids.
  • The children with low (but not high) functioning autism show a disadvantage for identifying eyes but an advantage for identifying mouths. In addition, they were better at identifying eyes and noses when the these were upside down than when they were upside up. This is the opposite of what is expected in typically developing children.
  • The authors discussed how this may be due to an aversion to looking directly at eyes, especially in upright faces. Therefore, the observed deficiencies in face recognition among the low functioning autism group may not be due to problems in the development of whole face recognition processes per se, but instead this weakness may be due to a natural aversion to stare at the eyes area of the face.
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    Eyes aversion in autism may affect face recognition
Tero Toivanen

Top Autism Facts - Top Autism Facts - 2 views

  • 1. Autism Is a 'Spectrum' Disorder
  • it is possible to be bright, verbal, and autistic as well as mentally retarded, non-verbal and autistic.
  • 2. Asperger Syndrome is a High Functioning Form of Autism
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  • The only significant difference between AS and High Functioning Autism is that people with AS usually develop speech right on time while people with autism usually have speech delays.
  • 3. People With Autism Are Different from One Another
  • 4. There Are Dozens of Treatments for Autism - But No 'Cure'
  • 5. There Are Many Theories on the Cause of Autism, But No Consensus
  • 6. People Don't Grow Out of Autism
  • 7. Families Coping with Autism Need Help and Support
  • 8. There's No 'Best School' for a Child with Autism
  • Even in an ideal world, "including" a child with autism in a typical class may not be the best choice. Decisions about autistic education are generally made by a team made up of parents, teachers, administrators and therapists who know the child well.
  • 9. There Are Many Unfounded Myths About Autism
  • Since every person with autism is different, however, such "always" and "never" statements simply don't hold water.
  • 10. Autistic People Have Many Strengths and Abilities
  • They are also ideal candidates for many types of careers.
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    This brief, pithy article provides the bare bones basics for a quick read - along with links to more in-depth information for those who want to know.
Tero Toivanen

How to unleash your brain's inner genius - life - 03 June 2009 - New Scientist - 0 views

  • A flurry of research published earlier this year in the journal Philosophical Transactions of the Royal Society B paints a very different picture. It turns out that these skills are far more common than previously thought. They may even arise from traits found in the general population, implying that savants are not fundamentally different from the rest of us. What's more, these skills may only blossom after years of obsessive practice, raising the question of whether many more people might cultivate similar skills, if only they had the motivation.
  • One of the biggest clues to the origins of savant talent lies in the fact that savants are far more common within the autistic population than among people with other mental difficulties.
  • Previously, about 1 in 10 people with autism were thought to have a special ability but in April, Patricia Howlin at the Institute of Psychiatry at King's College London found a much higher figure in the autistic adults she surveyed for savant skills or an exceptional cognitive ability.
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  • Savant skills included more fully developed talents, such as being able to name the elevation of both the sun and the moon at any time of day, on any specified date; being able to name the day of the week for any date in the distant past or future (a talent known as calendrical calculation) and perfect pitch. Importantly, the abilities and the skills had to be exceptional by the standards of the general population, but also well above the individual's overall level of ability. In total, roughly 30 per cent had some kind of special ability (Philosophical Transactions of the Royal Society B, vol 364, p 1359).
  • For musical savants like Paravicini, Happé suggests that a bias towards small details might have led their developing brains to focus more on the exact notes than the overall melody, leading to perfect pitch and an exceptional musical memory. In art, a focus on small regions of a picture could lead to accurate perspective drawing.
  • Most people find this harder when they are shown an unsegmented version of the pattern versus a segmented one, but people with autism don't have this preference, demonstrating their skill at seeing a whole in terms of its parts even if there are no obvious dividing lines (see diagram). "It shows they are able to do the segmentation in their minds," says Winner. The precocious realists did not have this preference either, indicating a talent for realistic drawing may arise from this isolated trait commonly found in autism (Philosophical Transactions of the Royal Society B, vol 364, p 1449).
  • Although these results help to pinpoint exactly what it is about autism that predisposes people to talent, it's still not clear why an eye for detail is more common in autistic people in the first place. Clues might lie in the work of Simon Baron-Cohen from the University of Cambridge, which suggests that people with autism are "hypersensitive" to sensory information
  • Daniel Tammet, a prodigious savant who has memorised pi to 22,514 digits, believes his own talents have arisen from a special ability to connect different pieces of information together. "Savant abilities are linked to a highly associative type of thinking, an extreme form of a kind that everyone does - examples would include daydreaming, puns and the use of metaphors," he says.
  • The few studies of savant brains certainly suggest they are physically different from the average brain. For example, when Happé and Wallace studied the brain of a savant gifted at art, calendrical calculation and memory, they found his cortex was thicker in the areas associated with visuospatial processing and calculation and thinner in other regions associated with social cognition, compared with people who were neither savants nor autistic. But whether these differences were innate or grew with lifelong practice was still unclear.
  • The answer to that question may come from an unlikely source - a study of London taxi drivers who have acquired an encyclopedic memory of the streets of London known as "the Knowledge". Given that taxi drivers must remember the layout of 25,000 streets and the location of thousands of places of interest, and retrieve the information instantaneously, some researchers like Happé believe the Knowledge qualifies as a savant-like skill.
  • Eleanor Maguire and colleagues at the Institute of Neurology at University College London and colleagues found that drivers with the Knowledge have a bigger rear hippocampus than bus drivers and adults who do not drive taxis. In addition, the hippocampus appears to be larger the longer a taxi driver has been working, and shrinks once they retire (Philosophical Transactions of the Royal Society B, DOI: 10.1098/rstb.2008.0288).
  • In fact, it seems the remaining mystery is not so much how savants achieve their talents, but what drives them in the first place. "Motivation is a big unknown," says Wallace. "It's an enormous driving force in giftedness and in savants, but we don't know a lot about it."
  • One person who has something of an inside view on what contributes to savant ability is Paravicini's mentor, Adam Ockelford, a professor of music at Roehampton University in London who has watched Paravicini's talent blossom since the age of 4. When they first met, Paravicini was entirely self-taught and bashed at his plastic keyboard with his fists and elbows to reproduce the sounds he was hearing. It was only after years of practice that his technical skills developed.
  • But as researchers like Wallace have suggested, Paravicini seemed motivated way beyond the average music student. In fact, he seemed to be playing as if his life depended on it, and Ockelford thinks it's this that truly sets savants apart from their peers. "The survival instinct gets turned with extraordinary force into something else - in Derek's case music," says Ockelford. "When people see Derek, they think it is amazing, almost religious. But to me, it's mainly just hard work."
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    But now researchers are beginning to unearth clues as to how savants' formidable brains work, and that in turn is changing our view of what it means to be a savant.
Tero Toivanen

Learn to Think Better: Tips from a Savant: Scientific American - 0 views

  • Daniel Tammet is author of two books, Born on a Blue Day and Embracing the Wide Sky, the latter of which came out in January. He is also a linguist and holds the European record for reciting the first 22,514 digits of the mathematical constant pi.
  • When I was a child, my behavior was far from being what most people would label “intelligent.” It was often limited, repetitive and antisocial.
  • I could not do many of the things that most people take for granted, such as looking someone in the eye or deciphering a person’s body language, and only acquired these skills with much effort over time. I also struggled to learn many of the techniques for spelling or doing sums taught in class because they did not match my own style of thinking.
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    Daniel Tammet is author of two books, Born on a Blue Day and Embracing the Wide Sky, the latter of which came out in January. He is also a linguist and holds the European record for reciting the first 22,514 digits of the mathematical constant pi.
Tero Toivanen

Autism Research Blog: Translating Autism: Expressive communication in children with sev... - 0 views

  • Given that the rate of elicited expressive communication in the present study is much lower than the suggested rate of teacher prompt, it can be assumed that teachers of students with autism do not actively promote their students’ expressive communication.
  • The results also indicate that verbal prompts and a combination of verbal prompts and modeling were the most commonly used instruction. However, simple (non-combined) prompts were most effective in eliciting a communicative response with kids with the most severe autism. But most surprisingly, physical prompts did not seem to be as effective as verbal prompts, which may also explain why verbal prompts were use significantly more by these teachers.
  • In sum, the study has implications for the type of techniques that are effective in eliciting communicative responses in children with severe autism. In this study simple verbal prompts and modeling were the most effective strategy to elicit communicative responses in these children.Chiang, H. (2009). Naturalistic observations of elicited expressive communication of children with autism: An analysis of teacher instructions Autism, 13 (2), 165-178 DOI: 10.1177/1362361308098513
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    In sum, the study has implications for the type of techniques that are effective in eliciting communicative responses in children with severe autism. In this study simple verbal prompts and modeling were the most effective strategy to elicit communicative responses in these children.
Tero Toivanen

Autism Blog - » Blog Archive » Is there an autism epidemic - the latest science - 0 views

  • A new paper from Eric Fombonne is in electronic print at the journal Pediatric Research.
  • The title is ‘Epidemiology of pervasive developmental disorders’
  • Combining all these categories together Fombonne presents a prevalence of 60-70/10,000.
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  • Pervasive Developmental Disorders, including Autistic Disorder, Asperger Disorder, Pervasive Developmental Disorder Not Otherwise Specified, and Childhood Disintegrative Disorder.
  • For autistic disorder, Fombonne says: The correlation between prevalence and year of publication was statistically significant and studies with prevalenceover 7/10,000 were all published since 1987. These findings point towards an increase in prevalence estimates in the last 15-20 years.
  • recent autism surveys have consistently identified smaller numbers of children with AS than those with autism within the same survey.
  • We therefore used for subsequent calculations an estimate of 6/10,000 for AS, recognizing the strong limitations of available data on AS.
  • How much lower is difficult to establish from existing data, but a ratio of 3 or 4 to 1 would appear an acceptable,
  • Eight studies provided data on childhood disintegrative disorder (CDD). Prevalence estimates ranged from 0 to 9.2/100,000.
  • Current evidence does not strongly support the hypothesis of a secular increase in the incidence of autism but power todetect time trends is seriously limited in existing datasets.
  • The upper-bound limit of the associated confidence interval (4.0/100,000) indicates that CDD is a very rare condition, with about 1 case to occur for every 103 cases of autistic disorder.
  • Whilst it is clear that prevalence estimates have gone up over time, this increase most likely represents changes in the concepts, definitions, service availability and awareness of autistic-spectrum disorders in both the lay and professional public.
  • The possibility that a true change in the underlying incidence has contributed to higher prevalence figures remains, however, to be adequately tested.
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