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標題: | 音高與量:後頂葉腦區在音樂音程辨識上扮演的角色 Pitch and Magnitude: The Role of Posterior Parietal Cortices in Discrimination of Musical Pitch Intervals |
作者: | Fong-Yi Guo 郭灃儀 |
指導教授: | 蔡振家(Chen-Gia Tsai) |
關鍵字: | 相對音感,後頂葉皮質,一般量處理,類別知覺,音程,功能性磁振造影, relative pitch,posterior parietal cortex,general magnitude processing,categorical perception,pitch interval,fMRI, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 音程為兩個音高之間的距離,由音高基頻的比值所決定。本研究以功能性磁振造影實驗,探討音程差距及音程大小如何影響分辨音程時的神經活動,29名相對音感良好的受試者(平均年齡22.8±2.4歲,兩名左手慣用者,19名女性)參與測驗,測驗中受試者要判斷聽到的音程相較於標準音程的大小,標準音程以唱名顯示在螢幕上,測驗包含標準音程大小(小二度、小六度)以及音程差距(半音、1/4音)兩種因子共四種試題條件。答題分數顯示,音程變大以及差距變小,都會顯著增加試題的答錯率。腦造影結果顯示,這兩個因子皆有主要效果。當音程差距縮小時,前腦島、前輔助運動區、基底核、腹側前運動皮質、額下回、背外側前額葉皮質活化增加;而當音程變大時,除了前述腦區活化增加之外,後頂葉腦區、背側前運動皮質、眶額皮質亦活化增加。此一結果似乎顯示,在辨識較大的音程時,處理一般量的右側後頂葉腦區與處理量之語意的左側後頂葉腦區需要共同活化。本研究為量及類別知覺的神經機制,提供了音樂音高方面的嶄新證據。 A pitch interval is determined by the frequency ratio of two pitches. The present study investigated the effects of interval size and interval deviation on neural activity during discriminating pitch intervals. Twenty-nine participants (22.8±2.4 years old, 2 left-handed, 19 females) completed an fMRI experiment, in which they were asked to determine whether the heard intervals were larger than the visually-presented standard intervals. We used a factorial design with factor Deviation (a semitone versus a quartertone) and Size (a minor second versus a minor sixth). Behavior data and fMRI data were subjected to 2×2 ANOVA. Significantly better performance was observed for the larger interval deviation and smaller interval size. Analysis of fMRI data revealed two main effects. When the interval deviation was a quartertone, increased activity was found in the anterior insula, pre-supplementary motor area, basal ganglia, ventral premotor cortex, inferior frontal gyrus, and dorsolateral prefrontal cortex compared to the conditions in which the interval deviation was a semitone. In addition to those areas, the posterior parietal cortex, dorsal premotor cortex, and orbitofrontal cortex also exhibited increased activity when the interval size was a minor sixth compared to a minor second. This finding suggests that the right posterior parietal cortex implicated in magnitude processing and the left posterior parietal cortex implicated in semantic processing of magnitude are increasingly involved in discrimination of pitch interval with larger sizes. The present study provides novel evidence of the neural mechanisms underlying magnitude processing and categorical perception of musical pitches. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/17799 |
DOI: | 10.6342/NTU202003365 |
全文授權: | 未授權 |
顯示於系所單位: | 腦與心智科學研究所 |
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