Altering cortical connectivity: remediation-induced changes in the white matter of poor readers.

Abstract:

:Neuroimaging studies using diffusion tensor imaging (DTI) have revealed regions of cerebral white matter with decreased microstructural organization (lowerfractional anisotropy or FA) among poor readers. We examined whether 100 hr of intensive remedial instruction affected the white matter of 8- to 10-year-old poor readers. Prior to instruction, poor readers had significantly lower FA than good readers in a region of the left anterior centrum semiovale. The instruction resulted in a change in white matter (significantly increased FA), and in the very same region. The FA increase was correlated with a decrease in radial diffusivity (but not with a change in axial diffusivity), suggesting that myelination had increased. Furthermore, the FA increase was correlated with improvement in phonological decoding ability, clarifying the cognitive locus of the effect. The results demonstrate the capability of a behavioral intervention to bring about a positive change in cortico-cortical white matter tracts.

journal_name

Neuron

journal_title

Neuron

authors

Keller TA,Just MA

doi

10.1016/j.neuron.2009.10.018

subject

Has Abstract

pub_date

2009-12-10 00:00:00

pages

624-31

issue

5

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(09)00847-2

journal_volume

64

pub_type

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