We will ask 80 patients with Parkinson's disease, representing the full spectrum of motor and cognitive symptoms, to participate. Participation will include measurement of eye movements using two methods: the new computer-based saccade battery and the best available video-based eye-tracking equipment. The evaluation will be repeated about 30 days later. Data will be analyzed to determine whether the computer-based tasks are reliable and able to provide the same quality of information as the gold standard in eye-tracking. A comparison sample of 80 healthy older adults will also complete the behavioral saccade tests in order to establish normative data that will enable application in clinical settings.

This study aims to look at injury rates experienced during a club travel volleyball season as correlated with self reported scores on the GRIT scale, Brief Resiliency Scale (BRS), and Athlete Burnout Questionnaire (ABQ) in male and female high school age volleyball players. The GRIT asks questions about passion and perseverance to achieve goals.
The BRS asks questions about resiliency after stress.
The ABQ asks questions to understand the determinants and consequences of athlete burnout. Completion of these surveys will take approximately 20 minutes.

Upon receiving and compiling all survey data, appropriate statistical analysis will be performed to assess for trends in the development of injuries and inform best practice on training.