人之初,性本善。這句說話在現今科學上究竟站不站著腳呢?405Please respect copyright.PENANArFhQZrpVrS
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(圖2)我們腦部有一隻蛋白酶名為Monoamine oxidase A (MAOA),它的功用是分解多巴胺(Dopamine)及血清素(Serotonin),防止這些物質過量聚集在腦部,避免神經線因這些物質過量聚集而影響正常運作。405Please respect copyright.PENANAIkDcL3Hs41
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另一方面來看,若MAOA蛋白酶過量產生在大腦裡頭的話,人們便會因血清素過低而陷入抑鬱症狀,因此早期亦有抗抑鬱藥物的設計是抑制MAOA的運作,盡量減少血清素的分解。405Please respect copyright.PENANA0LQqcPmRG3
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(圖3)研究發現,無論人類、老鼠及馬騮,若MAOA基因出現先天性的變異,因而導致腦部的MAOA蛋白酶數量偏少的話,腦部相關的神經物質過量類累積,導致暴力舉動及情緒激動等負面傾向的出現,醫學界命名此疾病為Brunner syndrome,病人較大傾向會犯下縱火、暴力及性罪行。405Please respect copyright.PENANApvSpnM0ZZz
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而基於這MAOA的基因是位於X染色體裡,男性(只有一條X染色體)出現此病的機率會高於女性(擁有兩條X染色體),這是因為兩條X染色體同時出現變異的機率比一條X染色體出現變異較低。405Please respect copyright.PENANA8JQjTZVeKG
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雖則後天教育對個人發展有著極為深厚的影響,但在先天性MAOA基因變異的前提下,有一部份人一出生便已經不是性本善了。405Please respect copyright.PENANAbXBMbxhywA
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如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。405Please respect copyright.PENANAHVrHzkoOu8
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc405Please respect copyright.PENANAxMHstp8wEC
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。405Please respect copyright.PENANApnYHmsiRaN
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Link:405Please respect copyright.PENANASKM8PdDZQ6
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio405Please respect copyright.PENANAGryBECQ6ae
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除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。405Please respect copyright.PENANAWNcDzuyGvL
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Ref1:https://science.sciencemag.org/content/304/5672/818.1.full405Please respect copyright.PENANATVMYW8wYgL
Ref2:https://science.sciencemag.org/content/sci/262/5133/578.full.pdf
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