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Frequency-Tagging Captures Distinct Neural Responses Elicited by Bilateral Periodic Thermonociceptive Stimulation
Chiara Leu1,2, Gabrielle Herbillon1, Giulia Liberati1,3
1Institute of Neuroscience, Université Catholique de Louvain, Brussels, Belgium.
The European Journal of Neuroscience
|May 5, 2026
Summary
This study shows that applying periodic heat pain stimuli to both forearms simultaneously can detect distinct brain responses. Preliminary evidence suggests these brain responses interact, opening new avenues for sensory integration research.
Area of Science:
- Neuroscience
- Sensory Physiology
- Pain Perception
Background:
- Periodic neural responses, or steady-state evoked potentials, are reliably detected in EEG using frequency tagging.
- Previous research on sustained thermonociceptive stimuli was limited to single limb stimulation.
- Investigating simultaneous bilateral stimulation is crucial for understanding sensory integration and competition mechanisms.
Purpose of the Study:
- To determine if bilateral simultaneous sustained thermonociceptive stimuli elicit distinct neural periodic responses.
- To explore potential interactions between neural populations responding to stimuli from different body locations.
Main Methods:
- Utilized slow, sustained, sinusoidal thermonociceptive stimuli.
- Applied stimuli bilaterally to the forearms at two distinct frequencies (f1, f2).
- Analyzed electroencephalography (EEG) data for neural responses at stimulation frequencies and intermodulation frequencies.
Main Results:
- Demonstrated that bilateral stimulation elicited two distinct periodic neural responses at the respective stimulation frequencies (f1, f2) and their harmonics.
- Observed preliminary evidence of neural activity at intermodulation frequencies (n*f1 ± m*f2), suggesting interaction between neural populations.
- Confirmed the feasibility of using frequency tagging for bilateral thermonociceptive stimulation.
Conclusions:
- Bilateral sustained sinusoidal thermonociceptive stimulation effectively elicits distinct frequency-tagged neural responses.
- Preliminary findings suggest neural interactions occur during simultaneous stimulation of distinct body parts.
- Further research is warranted to fully characterize intermodulation responses and their implications for sensory processing.
