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Reduced phase locking to slow amplitude modulation in adults with dyslexia: An MEG study
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Reduced phase locking to slow amplitude modulation in adults with dyslexia: An MEG study
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Journal Article
Reduced phase locking to slow amplitude modulation in adults with dyslexia: An MEG study
2012
Overview
Perception of speech at multiple temporal scales is important for the efficient extraction of meaningful phonological elements. Individuals with developmental dyslexia have difficulty in the accurate neural representation of phonological aspects of speech, across languages. Recently, it was proposed that these difficulties might arise in part because of impaired phase locking to the slower modulations in the speech signal (<10Hz), which would affect syllabic parsing and segmentation of the speech stream (the “temporal sampling” hypothesis, Goswami, 2011). Here we measured MEG responses to different rates of amplitude modulated white noise in adults with and without dyslexia. In line with the temporal sampling hypothesis, different patterns of phase locking to amplitude modulation at the delta rate of 2Hz were found when comparing participants with dyslexia to typically-reading participants. Typical readers exhibited better phase locking to slow modulations in right auditory cortex, whereas adults with dyslexia showed more bilateral phase locking. The results suggest that oscillatory phase locking mechanisms for slower temporal modulations are atypical in developmental dyslexia.
► MEG response to amplitude modulation at 2 and 4Hz rates shows two cortical sources. ► MEG response to amplitude modulation at 10 and 20Hz rates has one cortical source. ► Phase locking at 2Hz shows strong right auditory cortex activation in controls. ► Phase locking at 2Hz shows bilateral auditory cortex activation in dyslexics.
Publisher
Elsevier Inc,Elsevier Limited
Subject
/ Adult
/ Auditory Cortex - physiology
/ Brain
/ Dyslexia
/ Female
/ Functional Laterality - physiology
/ Humans
/ Male
/ MEG
/ Reading
