Oxyhemoglobin changes in the prefrontal cortex in response to cognitive tasks: a systematic review. (1st February 2019)

• Record Type: Journal Article
• Authors: Bonetti, Leandro Viçosa; Hassan, Syed A.; Lau, Sin-Tung; Melo, Luana T.; Tanaka, Takako; Patterson, Kara K.; Reid, W. Darlene
• Is Part Of: International journal of neuroscience. Volume 129:Number 2(2019)
• Page Start: 194
• Page End: 202
• Publication Date: 2019-02-01
• Subjects: Prefrontal cortex -- near infrared spectroscopy -- cognitive task -- oxyhemoglobins -- healthy subjects; Nervous system -- Periodicals; 612.805
• DOI: 10.1080/00207454.2018.1518906
• Languages: English
• ISSNs: 0020-7454

Abstract

Abstract: 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 ΔO2 Hb 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.