Distinct Subtypes of Apathy Revealed by the Apathy Motivation Index Ang, Yuen-Siang ; Lockwood, Patricia ; Apps, Matthew A. J. ; Muhammed, Kinan ; Husain, Masud Abstract Publication: PLoS ONE Pub Date: January 2017 DOI: 10.1371/journal.pone.0169938 Bibcode: 2017PLoSO..1269938A