本研究以事件相關腦電位(ERP)之實驗，探討臺灣閩南語使用者口說表現的語言變體是否足以代表其心理詞彙庫中的語言變體。
本研究實驗以圖片促發受試者的預期語音，記錄受試者對於不同次方言的變調方式之事件相關腦電位反應，同時也請他們對於所看到的圖及所聽到的音檔配對是否符合做判斷。配合圖片的語音有四類：正確答案，包含第五調之漳腔變調、正確答案，包含第五調之泉腔變調、正確答案，不包含第五調，錯誤答案。不包含第五調的正確答案和錯誤答案這兩類題目，用以作為判定該受試者的閩南語能力是否良好的依據。完成圖片促發的事件相關腦電位實驗後，請受試者進行看圖片說出其名稱，記錄其反應並計算這些口說反應的變調方式。
研究結果發現，就受試者進行看圖片說出其名稱的口說反應來看，有些受試者使用較多的漳腔變調方式，有些受試者使用較多的泉腔變調方式。但是不論他們面對圖片說出其名稱的反應使用較多的漳腔變調方式或是較多的泉腔變調方式，他們在聽到這兩類配對時，均認為是正確配對的比例相當高，表示其心理詞彙庫同時存有兩種腔調的變體。而從其腦電位的 N400 反應及溯源分析結果，都無法支持其看圖片說出其名稱的口說反應所傾向的腔調在理解時也比較容易。
這顯示當受試者口說表現偏向某一種腔調，並不代表大腦不熟悉另一種腔調。而其口說表現結果與腦電波反應結果之間並沒有一定的相關性，即便受試者在說某一個詞彙時偏向某一種腔調，並不代表其大腦對於該詞彙與那一種腔調的語音配對處理較容易。因此，可得知語言使用者的方言腔調處理歷程相當複雜，並具有個別差異，無法單從其口說表現的語言變體下定論。

In this study, to assess whether the preferred oral form, produced by each subject in off-line confrontation picture naming, is more easily processed, EEG was recorded while the subjects made the on-line picture-sound matching. Different tone-sandhi forms, used in two major Taiwanese subdialects, were manipulated to induce different responses shown in their event-related potentials. In addition to the two tone-sandhi conditions, there were two conditions irrelevant to tone-sandhi as fillers. The event-related stimuli consisted of four conditions in total.
Behavioral results in the on-line experiments showed a pretty high acceptance rate for either one of the two tone-sandhi varieties given the same picture. It is rarely revealed in their behaviors of off-line confrontation picture naming. Grouped by their preferred forms produced orally in off-line confrontation picture naming, 7 subjects tended to use subdialect A, and 15 subjects tended to use subdialect B. However, the preferred tone-sandhi condition didn’t elicit smaller N400 as predicted in each group. Furthermore, the results from source localization analyses of their event-related potentials also confirmed the N400 results.
The findings in this study that the preferred sandhi form, produced orally by each subject in off-line confrontation picture naming, was not unequivocally processed more easily than the other tone-sandhi form in on-line picture-sound matching, suggests a necessity to give a very careful consideration in delineating the boundaries of subdialects and trying to understand the mechanisms of dialectal amalgamations and merges.

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