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Neuroscience just got faster, cheaper and easier
Date:8/30/2012

s constantly adjusting the questions to meet the level of the person being tested, eliminating lots of extraneous questions.

"With the computer we cut to what we need to measure in each individual person," Gershon said. "We zero in on that person's individual level of functioning and don't waste their time asking questions far above or below their ability."

Scientists collected data from more than 20,000 participants to determine the difficulty level of every item and validate those items against "gold standard" measures.

This is how it works. In a vocabulary test administered to a third grader, the first item will be third grade level. If the student gets that correct, the next one will be 3.5 level and so forth until the computer has zeroed in on the student's precise ability level. The test only has 20 vocabulary questions compared to the traditional 50 items, but the shorter test is more reliable because half the items on the traditional test would be below the student's ability and half would be above it.

The shortened tests will aid a longitudinal study like the 100,000-subject National Children's Study, which can spend only so much time testing each child. "Even if we can only test a child for one hour every year we now can administer up to 20 tests during that hour and accurately track his or her development," Gershon said.

The new tests also are the first to measure a continuum of health from dysfunction through superfunction in neurological and behavioral health for persons ages 3 to 85. Most existing tests were developed to measure dysfunction A benefit of the continuum is being able to identify --- in longitudinal studies, epidemiological studies and clinical trials --- where problems begin to emerge and what the causes may be. To develop norms for the continuum, researchers measured a sample of 5,000 people in English and Spanish of various races and ethnicities of every age in 10 different data collectio
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Contact: Marla Paul
Marla-Paul@northwestern.edu
312-503-8928
Northwestern University
Source:Eurekalert

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