November 16, 2006

New diagnostic tool BioMAP quickly evaluates learning disabilities in children

By Wendy Leopold

A new, easy-to-use diagnostic tool that can quickly identify a sizeable subset of learning disabled children is now commercially available. That’s good news for youngsters aged 8 to 12 who, once identified, can get auditory training that can improve their academic learning.

“Learning disabilities are believed to affect nearly one in 10 children, but their causes are difficult to pinpoint,” says Nina Kraus, director of the Auditory Neuroscience Laboratory. Kraus and researchers Trent Nicol and Steven Zecker have found that a third of the 1,000-plus children they have tested show a dysfunction in the way the brainstem encodes basic sounds of speech.

BioMAP (Biological Marker of Auditory Processing) is based on more than a decade of neuroscience research at Northwestern. It is expected to become one of the most important resources for learning disabilities specialists trying to identify appropriate treatments for children with dyslexia and other language-based learning disabilities. Bio-logic Systems Corp., a Natus company, of Mundelein, Ill., holds an exclusive license for the technology from Northwestern.

“The beauty of BioMAP as a diagnostic tool is that it does not require a child to follow directions or perform an assigned task,” says Kraus. “Instead, it objectively measures whether a child’s nervous system is able to accurately translate sounds into brain waves.” If it can’t, the affected child will have difficulty discriminating between speech sounds. And that difficulty at the most fundamental level complicates a wide range of learning activities, including reading and writing, Kraus finds.

Getting objective measures from BioMAP software is simple. “All a child needs to do is stay awake and sit quietly for 20 to 30 minutes,” says Kraus, Northwestern’s Hugh Knowles Professor of Communication Sciences, Neurobiology and Otolaryngology. In fact, BioMAP testing can occur while a child watches a video. At Kraus’ laboratory, researchers place non-invasive electrodes on a child’s scalp and an earpiece that delivers carefully crafted acoustic sounds in one ear. As the child watches a movie, researchers measure the brain’s responses to the acoustic sounds.

Once identified as part of the subset of learning disabled children with sound encoding problems, these children receive auditory training that boosts their ability to better distinguish sounds. When researchers use BioMAP to re-evaluate the children after training, they find that the children show improved auditory processing ability that can later result in academic learning improvement.

BioMAP is currently available at Northwestern Audiology Clinic. Call (847) 491-3165 for information.