Extraction of cognitive activity-related waveforms from functional near-infrared spectroscopy signals

Akgul C. B., Akin A., Sankur B.

MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, cilt.44, sa.11, ss.945-958, 2006 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 44 Sayı: 11
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1007/s11517-006-0116-3
  • Dergi Adı: MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.945-958
  • Anahtar Kelimeler: functional near-infrared spectroscopy, brain hemodynamic response, independent component analysis, CEREBRAL HEMODYNAMICS, COMPONENT ANALYSIS, FMRI, ACTIVATION, RESPONSES, BRAIN, CORTEX, MRI, FLUCTUATIONS, VARIABILITY
  • Acıbadem Mehmet Ali Aydınlar Üniversitesi Adresli: Hayır

Özet

We address the problem of prototypical waveform extraction in cognitive experiments using functional near-infrared spectroscopy (fNIRS) signals. These waveform responses are evoked with visual stimuli provided in an oddball type experimental protocol. As the statistical signal-processing tool, we consider the linear signal space representation paradigm and use independent component analysis (ICA). The assumptions underlying ICA is discussed in the light of the signal measurement and generation mechanisms in the brain. The ICA-based waveform extraction is validated based both on its conformance to the parametric brain hemodynamic response (BHR) model and to the coherent averaging technique. We assess the intra-subject and inter-subject waveform and parameter variability.