Spectral analysis of event-related hemodynamic responses in functional near infrared spectroscopy

Akgul C., Sankur B., Akin A.

JOURNAL OF COMPUTATIONAL NEUROSCIENCE, vol.18, no.1, pp.67-83, 2005 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 18 Issue: 1
  • Publication Date: 2005
  • Doi Number: 10.1007/s10827-005-5478-2
  • Page Numbers: pp.67-83
  • Keywords: near infrared spectroscopy, cerebrovascular dynamics, time-frequency distribution, oscillary brain dynamics, CEREBRAL HEMODYNAMICS, OSCILLATIONS, CORTEX, FMRI


The goal of this paper is to design experiments that confirm the evidence of cognitive responses in functional near infrared spectroscopy and to establish relevant spectral subbands. Hemodynarnic responses of brain during single-event trials in an odd-ball experiment are measured by functional near infrared spectroscopy method. The frequency axis is partitioned into subbands by clustering the time-frequency power spectrum profiles of the brain responses. The predominant subbands are observed to confine the 0-30 mHz, 30-60 mHz, and 60-330 mHz ranges. We identify the group of subbands that shows strong evidence of protocol-induced periodicity as well as the bands where good correlation with an assumed hemodynamic response models is found.