Pupil size in people with synesthesia changed depending on how bright or dark the perceived colors were.

Synesthesia is a condition in which attributes, such as color, shape, sound, smell and taste, bind together in unusual ways, giving rise to atypical experiences, mental images or thoughts. For example ...

Each person's perception is individually unique and subjective (Cytowic 2018.) Anesthesia is the phenomenon of no sensation. Synesthesia is the phenomenon of multiple sensations. Human senses include ...

Ever since I can remember, numbers have appeared to me in specific colors. The number 2 is baby pink, 3 is sunshine yellow, 4 is royal blue-the list goes on. Its not just that they look a certain way, ...