ArticleExperimental brain research2025
Brain activation during vocal motor imagery: a pilot functional near-infrared spectroscopy (fNIRS) study.
Article in Experimental brain research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveThe purpose of this study was to clarify the differences in brain activation during actual vocalization and imagery, thereby deepening our understanding of the neural mechanisms underlying motor imagery. STUDY
designProspective study.
methodsA cross-sectional study was conducted on 23 healthy young adults (aged 21-22 years) who met strict voice and hearing criteria. Participants performed sustained phonation and vocal imagery tasks while listening to pre-recorded audio of the vowel /a:/ and humming /m:/. Brain activity in the right prefrontal cortex (rPFC), frontal pole (FP), and left prefrontal cortex (IPFC) was measured using a 16-channel functional near-infrared spectroscopy (fNIRS) system. A block design with baseline correction was applied to calculate changes in oxyhemoglobin concentration. Motor imagery ability was assessed using imagined Timed Up and Go Test (iTUG), and delta times between normal and maximum walking speeds were calculated.
resultsNo significant differences in activation values of the rPFC, FP, and IPFC were observed between the vocalization and imagery conditions. In addition, both conditions exhibited large variability across all regions, indicating substantial individual differences. Furthermore, while a significant correlation was found between the delta times of normal and maximum walking speeds, no significant correlations were observed between brain activation in the rPFC, FP, or IPFC and the delta times under the imagery condition.
conclusionsNo significant differences were found in neural activation between vocalization and imagery, but high variability in both conditions suggests individual differences. This study highlights both the potential and limitations of using fNIRS to assess brain activity in these tasks. LEVEL OF EVIDENCE: 4:
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