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- W1539770010 endingPage "26" @default.
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- W1539770010 abstract "本研究採活化再現性分析方法(Liou et al., 2006),分析三組功能性磁共振造影視覺實驗資料,認知作業包括偵測變化的視覺注意力(visual attention in change detection)、物件導向的空間注意力(visual attention in objectbasedselection in space)、及語言轉換的數字認知(language switching in numerical cognition)等。分析以個別受試者為主,且未將受試者資料校準至國際標準腦,以減少影像扭曲造成的誤差。重要的分析結果包括︰(1)多數大腦皮質同時參予不同的視覺認知作業,且當受試者執行完作業並凝視螢幕中央「+」時的活化反應區,與執行空間注意力作業反應區相似。此結果顯示,無論複雜或簡單的視覺認知作業,大腦皮質皆同時參予執行。由於大腦為一完整的訊息系統,本研究建議功能性磁振造影實驗研究應重視大腦不同區域的功能性聯結(神經網路),而非特殊區域的活化反應(localization)。(2)大腦聯絡皮質(associative regions)在所有作業中僅出現正向的反應,視覺皮質在所有作業中同時出現正向及負向反應,且與作業難度無關。掌管注意力及記憶的非特殊皮質(non-specificregions)在被動觀看刺激時僅出現正向的反應,但在需集中注意力的作業中,會同時出現正向及負向反應。由於聯絡皮質中γ-胺基丁酸(GABA)的濃度較其他皮質區少,且主要負責訊息的整合及長距離訊息傳輸,研究假設磁共振實驗中帶氧血紅素反應下降和γ-胺基丁酸的活動有關。本研究最後提出三個重要的訊息傳遞迴路:注意力、記憶、及情緒,做為探討功能性聯結研究的參考。" @default.
- W1539770010 created "2016-06-24" @default.
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- W1539770010 date "2012-03-01" @default.
- W1539770010 modified "2023-09-27" @default.
- W1539770010 title "An Information System in the Brain: Evidence from fMRI BOLD Responses" @default.
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