Age-related alterations in phase synchronization of oxyhemoglobin concentration changes in prefrontal tissues as measured by near-infrared spectroscopy signals

Qitao Tan, Ming Zhang, Yi Wang, Manyu Zhang, Bitan Wang, Qing Xin, Zengyong Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)


The prefrontal cortex plays an important role in planning complex cognitive behavior, personality expression, and decision making. This study aims to assess the phase synchronization of signals of the oxyhemoglobin concentration changes (Δ[HbO2]) in the left and right prefrontal tissues through near-infrared spectroscopy (NIRS) with wavelet phase coherence (WPCO) method. The NIRS signals were continuously recorded from the left and right prefrontal lobes in 43 healthy elderly subjects (age: 69.6 ± 8.4 years) and 40 young healthy subjects (age: 24.5 ± 1.7 years) during the resting state. Phase synchronization between the left and right prefrontal oscillations in six frequency intervals (I, 0.6–2 Hz; II, 0.145–0.6 Hz; III, 0.052–0.145 Hz; IV, 0.021–0.052 Hz; V, 0.0095–0.021 Hz; and VI, 0.005–0.0095 Hz) was analyzed using the WPCO method. The WPCO values of elderly subjects were significantly lower in frequency intervals I (F = 7.376, p = 0.010) and III (F = 6.418, p = 0.016) than those of the young subjects. Low phase coherence in intervals I and III indicates reduced synchronization of cardiac activity in the prefrontal area and weakened prefrontal functional connectivity, respectively.
Original languageEnglish
Pages (from-to)19-25
Number of pages7
JournalMicrovascular Research
Publication statusPublished - 1 Jan 2016


  • Cerebral oxygenation
  • Functional connectivity
  • Near-infrared spectroscopy
  • Spontaneous oscillations
  • Wavelet coherence
  • Wavelet phase coherence

ASJC Scopus subject areas

  • Biochemistry
  • Cardiology and Cardiovascular Medicine
  • Cell Biology

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