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Anterior limb of the internal capsule in schizophrenia: a diffusion tensor tractography study

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Abstract

Thalamo-cortical feedback loops play a key role in the processing and coordination of processing and integration of perceptual inputs and outputs, and disruption in this connection has long been hypothesized to contribute significantly to neuropsychological disturbances in schizophrenia. To test this hypothesis, we applied diffusion tensor tractography to 18 patients suffering schizophrenia and 20 control subjects. Fractional anisotropy (FA) was evaluated in the bilateral anterior and posterior limbs of the internal capsule, and correlated with clinical and neurocognitive measures. Patients diagnosed with schizophrenia showed significantly reduced FA bilaterally in the anterior but not the posterior limb of the internal capsule, compared with healthy control subjects. Lower FA correlated with lower scores on tests of declarative episodic memory in the patient group only. These findings suggest that disruptions, bilaterally, in thalamo-cortical connections in schizophrenia may contribute to disease-related impairment in the coordination of mnemonic processes of encoding and retrieval that are vital for efficient learning of new information.

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Acknowledgements

The authors would like to thank Nancy Maxwell and Jennifer Goodrich for administrative support; and Georgia Bushell, B.A., Kate Smith, B.A., Jorge Alvarado, B.A., and Usman Khan, B.A. for their support as research assistants. Additionally, we gratefully acknowledge the support of the National Institute of Health (K05 MH070047 and R01 MH 50740 to MES, R01 MH 40799 to RWM and R01MH 074794, P41RR013218 and P41EB015902 to CFW, P50MH 080272 to RWM, MES), the Department of Veterans Affairs Merit Awards (MES, RWM), and the VA Schizophrenia Center Grant (RWM/MES), Neuroimage Analysis Center, NAC (NIH P41RR013218) to CFW and RK. This work is also part of the National Alliance for Medical Image Computing (NAMIC), funded by the National Institutes of Health through the NIH Roadmap for Medical Research, Grant U54 EB005149 (MK, RK, MES).

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Correspondence to Marek Kubicki.

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Rosenberger, G., Nestor, P.G., Oh, J.S. et al. Anterior limb of the internal capsule in schizophrenia: a diffusion tensor tractography study. Brain Imaging and Behavior 6, 417–425 (2012). https://doi.org/10.1007/s11682-012-9152-9

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