此篇研究文章篇名為:Emotion recognition from facial EMG signals using higher order statistics and principal component analysis ,請連結至http://www.tandfonline.com搜尋該篇篇名,並且下載全文。搜尋及下載全文圖示:
下載全文後,答案就在“2. Related Work”段落中(左上角頁數 p.386),圖示: