Neuroradiology DOI 10.1007/s00234-014-1362-y

FUNCTIONAL NEURORADIOLOGY

Activation of auditory white matter tracts as revealed by functional magnetic resonance imaging Woo Suk Tae & Natalia Yakunina & Tae Su Kim & Sam Soo Kim & Eui-Cheol Nam

Received: 27 January 2014 / Accepted: 31 March 2014 # Springer-Verlag Berlin Heidelberg 2014

Abstract Introduction The ability of functional magnetic resonance imaging (fMRI) to detect activation in brain white matter (WM) is controversial. In particular, studies on the functional activation of WM tracts in the central auditory system are scarce. We utilized fMRI to assess and characterize the entire auditory WM pathway under robust experimental conditions involving the acquisition of a large number of functional volumes, the application of broadband auditory stimuli of high intensity, and the use of sparse temporal sampling to avoid scanner noise effects and increase signal-to-noise ratio. Methods Nineteen healthy volunteers were subjected to broadband white noise in a block paradigm; each run had four sound-on/off alternations and was repeated nine times for each subject. Sparse sampling (TR=8 s) was used. Results In addition to traditional gray matter (GM) auditory center activation, WM activation was detected in the isthmus and midbody of the corpus callosum (CC), tapetum, auditory radiation, lateral lemniscus, and decussation of the superior cerebellar peduncles. At the individual level, 13 of 19 subjects (68 %) had CC activation. Callosal WM exhibited a temporal W. S. Tae : N. Yakunina : S. S. Kim : E.

Activation of auditory white matter tracts as revealed by functional magnetic resonance imaging.

The ability of functional magnetic resonance imaging (fMRI) to detect activation in brain white matter (WM) is controversial. In particular, studies o...
3MB Sizes 0 Downloads 4 Views

Recommend Documents


Visualization of brain white matter tracts using heavily t2-weighted three-dimensional fluid-attenuated inversion-recovery magnetic resonance imaging.
The purpose of this study was to elucidate which white matter (WM)-tracts are visualized on heavily T2-weighted three-dimensional fluid-attenuated inversion-recovery (hT2w-3D-FLAIR) images. Records of seven patients who underwent hT2w-3D-FLAIR and di

Targeting of white matter tracts with transcranial magnetic stimulation.
TMS activations of white matter depend not only on the distance from the coil, but also on the orientation of the axons relative to the TMS-induced electric field, and especially on axonal bends that create strong local field gradient maxima. Therefo

Brain white matter tracts: functional anatomy and clinical relevance.
Diffusion tensor imaging is increasingly available on clinical magnetic resonance scanners and can be acquired in a relatively short time. There has been an explosion of applications in the research field but the use to the practicing radiologist may

Functional magnetic resonance imaging of motor cortex activation in schizophrenia.
Previous fMRI studies of sensorimotor activation in schizophrenia have found in some cases hypoactivity, no difference, or hyperactivity when comparing patients with controls; similar disagreement exists in studies of motor laterality. In this multi-

Visualization of white matter tracts using a non-diffusion weighted magnetic resonance imaging method: does intravenous gadolinium injection four hours prior to the examination affect the visualization of white matter tracts?
Visualization of white matter (WM)-tracts such as the corticospinal tract (CST), medial lemniscus (ML), and superior cerebellar peduncle (SCP) using delayed enhanced (DE)-heavily T2-weighted three-dimensional fluid-attenuated inversion-recovery (hT2w

Hue Selectivity in Human Visual Cortex Revealed by Functional Magnetic Resonance Imaging.
The variability of color-selective neurons in human visual cortex is considered more diverse than cone-opponent mechanisms. We addressed this issue by deriving histograms of hue-selective voxels measured using fMRI with a novel stimulation paradigm,

White matter tracts of speech and language.
Diffusion tensor imaging (DTI) has been used to investigate the white matter (WM) tracts underlying the perisylvian cortical regions known to be associated with language function. The arcuate fasciculus is composed of 3 segments (1 long and 2 short)

Functional Magnetic Resonance Imaging Methods.
Since its inception in 1992, Functional Magnetic Resonance Imaging (fMRI) has become an indispensible tool for studying cognition in both the healthy and dysfunctional brain. FMRI monitors changes in the oxygenation of brain tissue resulting from alt

Aging in deep gray matter and white matter revealed by diffusional kurtosis imaging.
Diffusion tensor imaging has already been extensively used to probe microstructural alterations in white matter tracts, and scarcely, in deep gray matter. However, results in literature regarding age-related degenerative mechanisms in white matter tr

White matter perivascular spaces on magnetic resonance imaging: marker of cerebrovascular amyloid burden?
We investigated the relationship between magnetic resonance imaging-visible centrum semiovale perivascular spaces (CSO-PVS), a biomarker of impaired interstitial fluid drainage, and positron emission tomography-based amyloid-β burden across a wide ra