synaesthesia 通感的定义？？？

麻烦高手给一下英文定义.

Synaesthesia is a joining together of sensations that are normally experienced separately.
Synaesthesia”。这个字源於希腊文"syn"(综合)+aisthesis(感官知觉)，意谓各感官之间的相互综合。联觉的种类很多，广泛而言涵盖了五大感官 (视、听、嗅、味、触)中，原本毫无关联之刺激项与感觉项的相连；例如听觉引发视觉 (音乐→色彩视觉) ，触觉引发视觉 (疼痛→颜色感觉) 等。事实上，除了上述的五大感官，语言文字本身也能触发联觉，像上述的星期与颜色、听到语言引发味觉等 。一般固有的观念是各感官之间有明确的划分 (听刺激→听觉；视刺激→视觉；触刺激→触觉)，彼此间平行运作。但联觉现象的发现打破了这个固有观念；感官之间不仅能相互触发，语言概念本身也可以引发感觉经验。换言之，联觉不仅是跨感官，也可以横跨意识概念与感觉经验。

1. A condition in which one type of stimulation evokes the sensation of another, as when the hearing of a sound produces the visualization of a color. 2. A sensation felt in one part of the body as a result of stimulus applied to another, as in referred pain. 3. The description of one kind of sense impression by using words that normally describe another.