為愛沖昏頭有理 因大腦失去判斷力

[Shangyih]

為愛沖昏頭有理　因大腦失去判斷力
華人健康網作者： 華人健康網 記者羅詩樺／編譯 | 華人健康網 – 2012年11月12日 下午4:26

古人說：「英雄難過美人關」，再理智的人一但遇上感情，常常會做出甘願犯險、不合乎常理的事，究竟為什麼愛的力量如此偉大？其實科學上有辦法可解釋，根據英國《每日郵報》報導，人在戀愛當中，大腦負責掌控「判斷力」的區域會自動關閉，讓人容易做出真的「不經大腦」思考的舉動。


英國倫敦大學學院神經學家澤基(Semir Zeki)表示，大腦在人進入戀愛狀態時，某些區域會變得較活躍，但掌控判斷力的額葉皮質區卻停止了活動，研究實驗中當受試者看到喜愛或崇拜的人照片時，會自動消除有關批評或懷疑的念頭，除非此種狀態結束，休眠區域才會再度重新活動，受試者的緊張不安等情緒也會隨之浮現。

此外，大腦中有人類快樂基因之稱的「多巴胺」（dopamine）物質，在戀愛中也會持續處於高濃度狀態，讓人有如同吸食鴉片、毒品一般的成癮現象，而高濃度的多巴胺也會帶來另一層影響，它使血液內的血清素減少，而當血清素降到一定水平時，就會影響到人的情緒與食慾，使戀愛中的情侶更顯患得患失，沒有安全感。

澤基也指出，人體此種生理模式應是為了「更高階的生物追求性」，以讓人類有更多的機會繁衍後代。若是兩人曾一同經歷某個刺激、緊張的經驗，腎上腺素的增加也是造成兩人之間感情升溫的催化劑，這也說明了為何明知不被允許，但社會上有關師生戀、出軌愛上小三的事件依舊層出不窮。

[kwojohn]

(失魂)

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