title: Mapping white-matter functional organization at rest and during naturalistic visual perception.
abstract: Despite the wide applications of functional magnetic resonance imaging (fMRI) to mapping brain activation and connectivity in cortical gray matter, it has rarely been utilized to study white-matter functions. In this study, we investigated the spatiotemporal characteristics of fMRI data within the white matter acquired from humans both in the resting state and while watching a naturalistic movie. By using independent component analysis and hierarchical clustering, resting-state fMRI data in the white matter were de-noised and decomposed into spatially independent components, which were further assembled into hierarchically organized axonal fiber bundles. Interestingly, such components were partly reorganized during natural vision. Relative to resting state, the visual task specifically induced a stronger degree of temporal coherence within the optic radiations, as well as significant correlations between the optic radiations and multiple cortical visual networks. Therefore, fMRI contains rich functional information about the activity and connectivity within white matter at rest and during tasks, challenging the conventional practice of taking white-matter signals as noise or artifacts.
authors.affiliation: Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA.
authors.forename: Lauren
authors.initials: L
authors.lastname: Marussich
authors.affiliation: School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA.
authors.forename: Kun-Han
authors.initials: KH
authors.lastname: Lu
authors.affiliation: School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA.
authors.forename: Haiguang
authors.initials: H
authors.lastname: Wen
authors.affiliation: Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA; School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA; Purdue Institute for Integrative Neuroscience, Purdue University, West Lafayette, IN, USA. Electronic address: zmliu@purdue.edu.
authors.forename: Zhongming
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000328:Adult; D016477:Artifacts; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D016000:Cluster Analysis; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010775:Photic Stimulation; D015203:Reproducibility of Results; D014795:Visual Pathways / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D066127:White Matter / Q000502:physiology*; D055815:Young Adult