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. 2017 Jan 24;9:1. doi: 10.3389/fnagi.2017.00001

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Copyright © 2017 Steiger and Bunzeck.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Masks used for the region of interest analysis. (A) 50%-probability mask of the nucleus accumbens (NAcc) from the Harvard-Oxford-Atlas (implemented in FMRIB Software Library, FSL). (B) Mask of the substantia nigra (SN)/ventral tegmental area (VTA), manually drawn. Both masks are superimposed on the mean T1-weighted image of all elderly participants.