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Updated: Feb 5, 2026

Using Fiberless, Wearable fNIRS to Monitor Brain Activity in Real-world Cognitive Tasks
Published on: December 2, 2015
Oxyhemoglobin changes in the prefrontal cortex in response to cognitive tasks: a systematic review
Leandro Viçosa Bonetti1,2, Syed A Hassan1,3, Sin-Tung Lau4,5
1a Department of Physical Therapy , University of Toronto , Toronto, ON , Canada.
Purpose Of The Study:
the aim of this study was to synthesize PFC fNIRS outcomes on the effects of cognitive tasks compared to resting/baseline tasks in healthy adults from studies utilizing a pre/post design.
Material And Methods:
original research studies were searched from seven databases (MEDLINE, EMBASE, CENTRAL, CINAHL, SCOPUS, PEDro and PubMed). Subsequently, two independent reviewers screened the titles and abstracts followed by full-text reviews to assess the studies' eligibility.
Results:
eleven studies met the inclusion criteria and had data abstracted and quality assessed. Methodology varied considerably and yet cognitive tasks resulted in the ΔO2Hb increasing in 8 of the 11 and ΔHHb decreasing in 8 of 8 studies that reported this outcome. The cognitive tasks from 10 of the 11 studies were classified as "Working Memory" and "Verbal Fluency Tasks".
Conclusions:
although, the data comparison was challenging provided the heterogeneity in methodology, the results across studies were similar.
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