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

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

Research output: Chapter in Book/Report/Conference proceedingConference 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.

Original languageEnglish
Title of host publicationOptical Tomography and Spectroscopy of Tissue XII
EditorsRobert R. Alfano, Eva Marie Sevick-Muraca, Bruce J. Tromberg, Arjun G. Yodh
ISBN (Electronic)9781510605596
Publication statusPublished - 2017
Externally publishedYes
EventOptical Tomography and Spectroscopy of Tissue XII - San Francisco, United States
Duration: 2017 Jan 302017 Feb 1

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherOptical Tomography and Spectroscopy of Tissue XII
Country/TerritoryUnited States
CitySan Francisco


  • ADHD
  • Controlled rejection
  • Motion artifact
  • Personalized evaluation
  • Semi-learning algorithm

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging
  • Biomaterials


Dive into the research topics of 'A semi-learning algorithm for noise rejection: An fNIRS study on ADHD children'. Together they form a unique fingerprint.

Cite this