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Schizophrenia is associated with often widespread changes in white matter
structure. Most studies have investigated changes in fractional
anisotropy, whereas alterations in radial or axial diffusivity have
barely been investigated until now.
To investigate radial diffusivity as a potential marker of dysmyelination
in direct relation to abnormalities in neural activation.
Neural activation in association with decision-making under uncertainty
was investigated in 19 people with schizophrenia and 20 healthy controls
and linked to radial diffusivity as measured by diffusion tensor
Decision-making under uncertainty was associated with a significantly
decreased activation in a frontostriatocingulate network in the
schizophrenia group. Structurally, they exhibited increased radial
diffusivity in temporal white matter that was negatively correlated with
activation in parts of the frontostriatocingulate network.
Present data indicate that altered diffusivity within relevant white
matter networks may be closely linked to abnormal neural activation in
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