In this two-part radio series from BBC Radio 4, the condition of synaesthesia is explored through interviews with scientists and those who have been diagnosed with the condition. Synaesthesia is a condition in which the five senses intermingle, so that stimulation in one sense may give rise to a stimulation in another sense. For one example, certain letters of the alphabet may be associated with...

As the "Scientific American_ article in the first Web site (1) asks: "When you eat chicken, does it feel pointy or round? Is a week shaped like a tipped-over D with the days arranged counterclockwise? Does the [musical] note B taste like horseradish? Do you get confused about appointments because Tuesday and Thursday have the same color?" For most people, the answer would be a resounding 'no,' but...

Synesthesia (or synaesthesia) is loosely defined as "senses coming together." At its simplest level, synesthesia means that when a certain sense or part of a sense is activated, another unrelated sense or part of a sense is activated concurrently. For example, when someone hears a sound, he or she immediately sees a color or shape in his or her "mind's eye." The Synesthesia Project's website...