From Wikipedia, the free encyclopedia
腹側被蓋區(ventral tegmental area,VTA)係中腦最底嘅一個腦區。
VTA 係人腦犒賞系統(reward system)嘅重要一部份:VTA 有份對「顯示有犒賞存在」嘅外界刺激(例如係「見到朋友」或者「聞到嘢食好香」噉)俾反應-VTA 有神經通道連去伏隔核嗰一帶,又有通道連去前額皮層,當一隻動物感知到犒賞出現,伏隔核同前額皮層嘅多巴胺(dopamine;神經傳遞素一種)濃度會突然勁升,而呢啲多巴胺訊號係源自 VTA 嘅,話俾伏隔核同前額皮層知「有犒賞出現」[1]。簡單噉講,伏隔核嗰頭啲腦區-例如係杏仁核-跟住會負責令隻動物出現動機同情緒上起變化,準備好要採取行動嚟攞想要嘅犒賞,而前額皮層就負責比較「高層」嘅認知功能,例如係衡量件犒賞嘅價值呀噉[2][3]。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.