VEPs will be generated using a commercially available Diopsys NOVA System utilizing a fixed protocol. The stimulus will be presented on a 17-inch LCD monitor, running at 75 frames/s. Commercially available skin preparation and EEG paste will be used for recording of the SD-tVEP. Synchronized single-channel VEPs will be recorded, generating a time series of 1024 data points per analysis window. The room luminance will be maintained at scotopic conditions (<0.3 NITS). Preadaptation will be unnecessary for the SD-tVEP recordings. Multiple tests are run to comprise one SD-tVEP protocol. One complete NOVA-VEP (FP) presents a stimulus for a maximum of 1 minute and 46 seconds.