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Limonene Selectively Modulates Visual Attention Through P300 Suppression: A Comparative Event-Related Potential Study

Kaori Tamura1, Taiki Nishimura2, Yuko Ohno3,4

  • 1Department of Basic Sciences, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu, Japan.

Brain and Behavior
|October 30, 2025
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Summary
This summary is machine-generated.

Limonene, a citrus odor compound, reduced visual attention, suggesting chemical properties, not emotions, drive olfactory-visual interactions. This highlights specific chemical effects on cognition.

Keywords:
P300event‐related potentialslimonenevisual selective attention

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Olfactory Research

Background:

  • Odor stimuli are known to influence cognitive functions like selective attention.
  • The precise mechanism—chemical properties versus emotional/semantic associations—remains debated.
  • This study isolates chemical odor effects on visual attention.

Purpose of the Study:

  • To determine if odor compounds influence visual attention via chemical properties or psychological factors.
  • To investigate the role of limonene and lemon essential oil in modulating selective attention.
  • To differentiate chemical-specific olfactory-visual interactions from mood-based effects.

Main Methods:

  • Utilized a visual oddball task to measure event-related potentials (P300 component).
  • Assessed the impact of no odor, pure limonene, and lemon essential oil on attention.
  • Collected subjective ratings for pleasantness, congruency, and arousal.

Main Results:

  • Limonene significantly decreased P300 peak amplitudes compared to the no-odor condition.
  • Lemon essential oil did not show a significant reduction in P300 amplitudes.
  • No significant differences in subjective pleasantness, congruency, or arousal were found between odors.

Conclusions:

  • Limonene modulates selective attention primarily through its inherent chemical characteristics.
  • Findings support chemically specific olfactory-visual interactions.
  • Emphasizes the need to distinguish chemical from psychological influences in cross-modal research.