We know "A is for Apple," but is A also for "red"? About 5 percent of the population has synesthesia, or "crossed" responses to stimuli. Those with color-grapheme synesthesia see certain letters in ...

Hyperesthesia is a heightened sensitivity to stimuli. It may affect any of the senses but often involves touch, pain, and temperature sensations. We take in the world around us through our senses.

Microneurography is a method that allows the researchers to listen to the nerve signalling in one nerve cell at a time. No less than 16 different types of nerve cells have been identified by ...