there are a variety of auditory agnosias. pure word deafness affects people who have normal speech and they can read, but they can't understand anything that is said to them. agnosia for environmental sounds affects people who cannot recognize a dog barking. >> rose: right. >> or an alarm clock ringing. or sneezing or laughing. there are a variety of music agnosias, so-called amusias and the best recognized there is so-called tone-deafness. these are people who not only cannot carry a tune, but they don't -- but they don't recognize if you give a tune and alter it or make it dissonant they don't recognize anything is wrong. they may not -- if it is severe be able to tell which of two pitches is higher than the other. >> rose: yes. >> i think one of the most fascinating agnosias, though, is the long name agnosia which refers to the ability to recognize that anything with newer, that anything was neurologically wrong, and a spectacular form of this is agnosia for one side of your body being paralyzed. somebody with a stroke mig