大腦暗能量(Dark Energy) - 腦網路預設模式

預設模式網路(default mode network, DMN)指的是大腦在休息狀態的時候,

仍然會繼續有活動的模式。這個觀念與早期神經科學家所認為的概念相反,早期認為當人們在休息時,

大腦內的神經線路處於關閉的狀態。

DMN最早是由EEG發明者 Hans Berger 所發現,他在eeg訊號中發覺休息中的大腦有一些"Noise"訊號產生,因此提出大腦系統並非只有在清醒時才有活性的論點;早期這個說法並未被接受。

直到1970年代末正子斷層掃描(positron emission tomography)的發明以及1992年以後的功能性磁振造影(functional MRI)的出現,讓觀察大腦的活動更為精確。後來這個說法逐漸被人所接受,然而這個背後所帶來活動的"來源"到目前為止仍為未知,但被認為是維持頭腦運作的重要機制之一。

詳細內容可參考科學人雜誌

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