Over the past 20 years, there has been speculation about a connection between immunizations and an increase in autism. However, a study by Mayo Clinic researchers published in the January issue of Archives of Pediatrics and Adolescent Medicine suggests the increase may be due to improved awareness, changes in diagnostic criteria and availability of services, not environmental factors or immunizations.
"This study is the first to measure the incidence -- the occurrence of new cases -- of autism by applying consistent, contemporary criteria for autism to a specific population over a long period of time," says William Barbaresi, M.D., a Mayo Clinic developmental pediatrician and one of the study authors. "In doing so, the study accounts for improvements in the diagnostic criteria for autism, the medical community’s improved understanding of this disease and changes in federal special education laws."
The study found that the increase in the incidence of autism in Olmsted County, Minn. coincided with broadening of the diagnostic criteria for autism and new federal special education laws including autism as a disability category. Both events occurred many years after immunizations were mandated for school entry. Broader, more precise diagnostic criteria for autism were introduced in 1987. Prior to these new criteria, children with autism may have been given less precise diagnoses such as "developmental delay" or "mental retardation," and children with milder symptoms of autism may not have been identified at all. The 1991 federal special education laws improved the availability of educational services for children with autism.
Advanced analysis of brain structure shape may track progression to Alzheimer's disease
26.10.2016 | Massachusetts General Hospital
Indian roadside refuse fires produce toxic rainbow
26.10.2016 | Duke University
Physicists from the University of Würzburg have designed a light source that emits photon pairs. Two-photon sources are particularly well suited for tap-proof data encryption. The experiment's key ingredients: a semiconductor crystal and some sticky tape.
So-called monolayers are at the heart of the research activities. These "super materials" (as the prestigious science magazine "Nature" puts it) have been...
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
28.10.2016 | Power and Electrical Engineering
28.10.2016 | Physics and Astronomy
28.10.2016 | Life Sciences