Semantic fluency and processing speed are reduced in non-cognitively impaired participants with Parkinson’s disease

Brenna A. Cholerton, Kathleen L. Poston, Laurice Yang, Liana S. Rosenthal, Ted M. Dawson, Alexander Pantelyat, Karen L. Edwards, Lu Tian, Joseph F. Quinn, Kathryn A. Chung, Amie L. Hiller, Shu Ching Hu, Thomas J. Montine, Cyrus P. Zabetian