Background Noise Levels Affect Dyslexic Adults

Main Category: Dyslexia
Article Date: 27 Nov 2011 - 0:00 PST

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Dyslexia affects up to 17.5% of the population, but its cause remains somewhat unknown. A report published in the online journal PLoS ONE supports the hypothesis that the symptoms of dyslexia, including difficulties in reading, are at least partly due to difficulty excluding excess background information like noise.

In the study of 37 undergraduate students, the researchers, led by Rachel Beattie of the University of Southern California, found that the poor readers performed significantly worse than the control group only when there were high levels of background noise.

The two groups performed comparably at the prescribed task when there was no background noise and when the stimulus set size was varied, either a large or a small set size.

According to Dr. Beattie, "these findings support a relatively new theory, namely that dyslexic individuals do not completely filter out irrelevant information when attending to letters and sounds. This external noise exclusion deficit could lead to the creation of inaccurate representations of words and phonemes and ultimately, to the characteristic reading and phonological awareness impairments observed in dyslexia."

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