1) Effect of head impacts on diffusivity measures in collegiate contact sport athletes and 2) Topic of the month: Parkinson's and parkinsonism disorders. This podcast for the Neurology Journal begins and closes with Dr. Robert Gross, Editor-in-Chief, briefly discussing highlighted articles from the print issue of Neurology. In the second segment Dr. Noah Kolb interviews Dr. Thomas McAllister about his paper on effect of head impacts on diffusivity measures in collegiate contact sport athletes. Dr. Adam Numis is reading our e-Pearl of the week about recurrent rhabdomyolysis. In the next part of the podcast Dr. Matt Barrett interviews Dr. Dan Weintraub about management of neuropsychiatric manifestations of Parkinson disease. The participants had nothing to disclose except Drs. McAllister, Numis and Weintraub.Dr. McAllister receives research support from the NIH.Dr. Numis serves on the editorial team for the Neurology® Resident and Fellow Section. Dr. Weintraub serves as an editorial board member of Movement Disorders Journal; serves on the scientific advisory board of Pfizer Inc, Teva Pharmaceutical Industries Ltd., Avanir Pharmaceuticals, Merck Serono, Eli Lilly and Company, Biogen Idec, Lundbeck Inc., UCB, Bristol-Myers Squibb, CHDI Foundation, Inc, ADCS; receives fees from the University of Pennsylvania for licensing of Questionnaire for Impulsive-Compulsive Disorders in Parkinson disease; receives commercial funding for travel from Teva Pharmaceutical Industries Ltd.; gave expert testimony for defense in 2012-2013 in lawsuit related to impulse control disorders in Parkinson disease; receives research support from Novartis, Michael J. Fox Foundation for Parkinson's Research and the NIH.