title: Thalamic volume and thalamo-cortical white matter tracts correlate with motor and verbal memory performance.
abstract: Cognitive testing and diffusion tensor imaging data from 121 normal subjects were combined to investigate the relationship between thalamic connectivity and cognitive performance. Thalamic regions were segmented based on their cortical connectivity, and regions for both ipsilateral and contralateral thalamocortical connections were identified. White matter tracts corresponding to these regions were identified and the mean fractional anisotropy, and axial and radial diffusivities within each tract were measured. Motor task performance correlated with radial diffusivity in the dominant thalamo-precentral tract. Verbal memory corresponded with the thalamic volume connected to the left temporal lobe. These data support the use of diffusion tractography to identify functionally important regions within the thalamus. Our findings provide the first robust correlation between thalamic volumes and tract characteristics with cognitive performance data in normal subjects.
authors.affiliation: The Brain Dynamics Centre, Sydney Medical School - Westmead, Sydney, NSW 2145, Australia; Westmead Millennium Institute, Westmead, Sydney, NSW 2145, Australia; Sydney Translational Imaging Laboratory, Sydney Medical School, University of Sydney, Camperdown, NSW 2050, Australia.
authors.forename: David J
authors.initials: DJ
authors.lastname: Philp
authors.affiliation: The Brain Dynamics Centre, Sydney Medical School - Westmead, Sydney, NSW 2145, Australia; Westmead Millennium Institute, Westmead, Sydney, NSW 2145, Australia; Sydney Translational Imaging Laboratory, Sydney Medical School, University of Sydney, Camperdown, NSW 2050, Australia; Discipline of Psychiatry, University of Sydney Medical School: Western, Westmead Hospital, Sydney, NSW 2145, Australia.
authors.forename: Mayuresh S
authors.initials: MS
authors.lastname: Korgaonkar
authors.affiliation: The Brain Dynamics Centre, Sydney Medical School - Westmead, Sydney, NSW 2145, Australia; Westmead Millennium Institute, Westmead, Sydney, NSW 2145, Australia; Sydney Translational Imaging Laboratory, Sydney Medical School, University of Sydney, Camperdown, NSW 2050, Australia; Department of Radiology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia. Electronic address: sgrieve@med.usyd.edu.au.
authors.forename: Stuart M
authors.initials: SM
authors.lastname: Grieve
mesh_terms: D000293:Adolescent; D000328:Adult; D016880:Anisotropy; D001288:Attention / Q000502:physiology; D002540:Cerebral Cortex / Q000502:physiology*; D003071:Cognition / Q000502:physiology; D056324:Diffusion Tensor Imaging; D056344:Executive Function / Q000502:physiology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008568:Memory / Q000502:physiology*; D008875:Middle Aged; D009048:Motor Skills / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D013788:Thalamus / Q000502:physiology*; D014706:Verbal Learning / Q000502:physiology*; D055815:Young Adult
keywords: Diffusion tensor imaging; Fractional anisotropy; Magnetic resonance imaging; Motor task performance; Probabilistic tractography; Thalamus