ArticleFrontiers in behavioral neuroscience2026
Association of simultaneous sour taste stimulation with prefrontal cortex activation during stroop task performance in healthy adults: a fNIRS study.
Article in Frontiers in behavioral neuroscience, 2026. 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
Background: The prefrontal cortex (PFC) plays a central role in executive functions, particularly during cognitive conflict tasks. Sour taste is a salient oral sensory stimulus and may be associated with changes in behavioral performance and prefrontal activation during cognitive tasks. This study examined whether simultaneous sour taste stimulation was associated with behavioral and prefrontal hemodynamic changes during Stroop task performance in healthy adults using functional near-infrared spectroscopy (fNIRS). Methods: Twenty-six right-handed healthy adults were randomly assigned to either the sour taste group (0.1 M citric acid, Results: The sour taste group showed faster overall reaction times and higher overall accuracy than the water control group during Stroop task performance. However, no significant between-group differences were observed in Stroop interference scores for reaction time or accuracy. At the neural level, both groups showed task-related frontal activation, while the sour taste group exhibited higher Oxy-Hb β values in several channels, particularly in the left dorsolateral prefrontal cortex and frontopolar region. Conclusion: Simultaneous sour taste stimulation was associated with better overall task performance and stronger task-related prefrontal hemodynamic responses in healthy adults during the Stroop task. These findings support an association between sour taste stimulation, broader behavioral facilitation, and altered prefrontal recruitment, but do not provide clear evidence for a conflict-specific enhancement of Stroop interference control.
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