在前瞻記憶作業中，為了履行被延遲的意圖而造成進行中的活動表現下降，稱為前瞻干擾效果。普遍認為，前瞻干擾效果反映出，為了準備提取被延遲的意圖，而從其他進行中的活動所挪用的注意力資源。本篇論文使用前瞻編碼/提取實驗派典(prospective memory encoding/retrieval paradigm)，研究前瞻干擾效果如何受到前瞻記憶線索的出現機率所調控。此外，也利用事件相關腦電位實驗來研究前瞻干擾效果的神經相關。 行為實驗結果顯示，相較於前瞻記憶線索出現機率較高的情況下，機率較低時，前瞻干擾效果比較大；這暗示著，當前瞻記憶線索出現機率較低時，受試者挪用較多的注意力資源在為提取前瞻記憶做準備。在實驗三中，事件相關腦電位結果顯示，和前瞻記憶的準備歷程相關的腦電位有二：前瞻持續正向電位(PM sustained positivity)和晚期正向複合電位(late positivity complex)。每當作業中加入一個被延遲的意圖時，前瞻持續正向電位就會產生，其電位並不會受到前瞻記憶線索的出現機率所調控。另一方面，當有個被延遲的意圖需要被執行時，晚期正向複合電位就會增強，而且在前瞻記憶線索的出現機率較低時增強更多；這些結果顯示出，主要造成前瞻干擾效果的歷程和前瞻監控有關。 本研究結果指出，前瞻記憶線索的出現機率是藉由調節挪用至前瞻監控歷程的注意力資源量，進而影響前瞻干擾效果。當線索的出現機率較低時，較多的注意力資源被挪用至監控環境以察覺前瞻記憶線索，造成較大的前瞻干擾效果。 ;The prospective interference effect refers to the performance decline of the ongoing activities due to a delayed intention to be implemented in the prospective memory tasks. It is generally thought to reflect the recruitment of attentional resource for preparing the retrieval of the delayed intention while engaging in the ongoing activities simultaneously. This thesis investigated how the prospective interference effect is modulated by the probability of the prospective memory (PM) cue presentation using prospective memory encoding/retrieval paradigm. Furthermore, the neural correlates of the prospective interference effect were investigated using event-related potential (ERP) measures. The behavioral results revealed that the prospective interference effect was higher in the low-probability condition than in the high-probability one, which indicated that the participants recruited more attentional resource for preparatory attentional processes when the probability of the PM cue presentation was low. The ERP results in Experiment 3 found that two ERP components, the PM sustained positivity and the late positivity complex (LPC), were associated with the preparatory processes for prospective remembering. The PM sustained positivity arose in the ongoing activity trials whenever a delayed intention was added, and its amplitude was not modulated by the probability of the PM cue presentation. On the other hand, the amplitude of the LPC was larger when there was an intention to be performed, and was larger in the low-probability condition. These results indicated that the processes underlying the prospective interference effect refer to the prospective monitoring. The current findings suggested that the probability of the PM cue presentation influences the prospective interference effect by modulating the magnitude of the attentional resource engaged in prospective monitoring. When the probability of the PM cue presentation was low, more attentional resource were employing on monitoring the environment for the PM cue, leading higher prospective interference effect.
