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We recorded whole-scalp cerebral magnetic fields from healthy adults to painful CO 2 pulses (duration 200 ms, concentration 65–90%), led to the left or right nostril once every 20 or 30 s. The stimuli were embedded in a continuous airflow (140 ml/s, 36.5°C, relative humidity 80%) to prevent alterations in the mechanical and thermal conditions of the nasal mucosa. The recording passband was...
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