2012-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/701717摘要：此計畫擬採用功能性磁振造影技術配合行為實驗來探索大腦的無意識語意處理機制。過去研究對於語意訊息是否可以在刺激沒有被意識到（無法偵測或辨識）的情況下被抽取出來，爭議不休。爭議的來源主要來自於這類研究所面臨的困境：如何確保刺激確實是在沒有被意識到的情況下進行處理。我們過去的研究（Yeh, He, & Cavanagh, in press; Yang & Yeh, 2011）使用視覺擁擠（visual crowding, ）與持續閃現抑制（continuous flash suppression）派典，清楚地顯示了即使刺激在無法偵測或辨識的情況下，仍能進行無意識的語意處理。延續這兩篇研究的行為實驗結果，我們擬在此計畫中探討其大腦神經機制。研究一將檢視單字詞在視覺擁擠下，腦中所激發的語意網絡與其單獨呈現時的活動差異，同時將蒐集行為資料以驗證刺激的確在無意識情況下被處理；研究二將採用持續閃現抑制派典配合腦造影技術，探究此派典下無意識語意網絡的大腦活動情形；研究三則基於研究一、二的成果，進一步探討注意力在兩種派典下對於無意識語意處理的影響。預期此計畫的成果將闡明無意識語意處理的機制，且藉由與意識狀態下的比較進一步了解意識的本質。<br> Abstract: The goal of this proposal is to investigate the brain mechanism of unconscious semantic processing by using event-related fMRIs and behavioral experiments. It has long been debated whether semantic information can be extracted in the absence of detection or identification of the stimuli. Controversies arise mainly due to the difficulty in exploring mental processes that are completely devoid of consciousness. Our previous studies (Yeh, He, & Cavanagh, in press; Yang & Yeh, 2011) used the paradigms of visual crowding and continuous flash suppression and demonstrated clearly unconscious semantic processing without conscious identification and detection, respectively. Following these behavioral measures, we aim to explore their brain mechanisms in the current project. Study 1 will examine the semantic network in the brain for crowded words and isolated words; validated behavioral measures will be used to ensure the parameters used can indeed differentiate unconscious vs. conscious perception of the words in the crowded and isolated words conditions respectively. Study 2 will use the continuous flash suppression paradigm to further examine brain mechanisms of semantic priming with invisible prime words. Study 3 will examine the role of attention on unconscious semantic processing under crowding and continuous flash suppression. Results are expected to shed light on the existence, extent, and neural substrates of unconscious semantic processing, and the comparison with comparable visible conditions will reveal to us the nature of consciousness.語意處理視覺擁擠持續閃現抑制注意力空間線索semantic processingcrowdingcontinuous flash suppressionattentionspatial cueing