Voice blindness, or phonagnosia, is a rare disorder that has to do with how the brain processes voices. iStockphoto.com hide caption

itoggle caption iStockphoto.com
Lev Yilmaz

Tom DeBaggio, a herb and gardening expert, was diagnosed with early onset Alzheimer's disease in 1999. 1999 File photo/Washington Post via Getty Images hide caption

itoggle caption 1999 File photo/Washington Post via Getty Images

"Glamorous Gal," a P-51 Mustang. Gemma Watters/NPR hide caption

itoggle caption Gemma Watters/NPR

Michael Patrick Thornton is artistic director and co-founder of Chicago's Gift Theatre Company, and has appeared on ABC's Private Practice. Michael Desmond/ABC hide caption

itoggle caption Michael Desmond/ABC