A semi-learning algorithm for noise rejection: An fNIRS study on ADHD children

Stephanie Sutoko, Tsukasa Funane, Takusige Katura, Hiroki Satou, Masashi Kiguchi, Atsushi Maki, Yukifumi Monden, Masako Nagashima, Takanori Yamagata, Ippeita Dan

研究成果: Conference contribution


In pediatrics studies, the quality of functional near infrared spectroscopy (fNIRS) signals is often reduced by motion artifacts. These artifacts likely mislead brain functionality analysis, causing false discoveries. While noise correction methods and their performance have been investigated, these methods require several parameter assumptions that apparently result in noise overfitting. In contrast, the rejection of noisy signals serves as a preferable method because it maintains the originality of the signal waveform. Here, we describe a semi-learning algorithm to detect and eliminate noisy signals. The algorithm dynamically adjusts noise detection according to the predetermined noise criteria, which are spikes, unusual activation values (averaged amplitude signals within the brain activation period), and high activation variances (among trials). Criteria were sequentially organized in the algorithm and orderly assessed signals based on each criterion. By initially setting an acceptable rejection rate, particular criteria causing excessive data rejections are neglected, whereas others with tolerable rejections practically eliminate noises. fNIRS data measured during the attention response paradigm (oddball task) in children with attention deficit/hyperactivity disorder (ADHD) were utilized to evaluate and optimize the algorithm's performance. This algorithm successfully substituted the visual noise identification done in the previous studies and consistently found significantly lower activation of the right prefrontal and parietal cortices in ADHD patients than in typical developing children. Thus, we conclude that the semi-learning algorithm confers more objective and standardized judgment for noise rejection and presents a promising alternative to visual noise rejection.

ホスト出版物のタイトルOptical Tomography and Spectroscopy of Tissue XII
編集者Robert R. Alfano, Eva Marie Sevick-Muraca, Bruce J. Tromberg, Arjun G. Yodh
出版ステータスPublished - 2017 1月 1
イベントOptical Tomography and Spectroscopy of Tissue XII - San Francisco, United States
継続期間: 2017 1月 302017 2月 1


OtherOptical Tomography and Spectroscopy of Tissue XII
国/地域United States
CitySan Francisco

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • 生体材料
  • 放射線学、核医学およびイメージング


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