Dr. Snyder earned a Ph.D. degree studying the effects of visual deprivation in the cat. He then obtained an M.D. degree and currently is board certified in neurology. His first scientific interest was electrophysiology (EEG, evoked potentials and inverse source localization theory). More recently he has been concerned with 3D image analysis. He has created algorithms for common mode (e.g., PET-PET) and cross modal (e.g., PET-MRI) image registration. He also has devised an alogrithm for unsupervised correction of artifactual MRI intensity inhomogeneities. Neuroscience projects in which he is currently active include (1) fMRI investigations of mentation in the blind (e.g., Braille reading) (2) human visual field mapping using fMRI (retinotopy) (3) diffusion tensor imaging (DTI) and DTI-fiber tracking (4) MRI-based quantitative analysis of atrophy and white matter disease in relation to aging and dementia (5) fMRI investigations of event segmentation and the perception of bizarrenss.