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Inspiratory phase‐locked alpha oscillation in human olfaction: source generators estimated by a dipole tracing method
Author(s) -
Masaoka Yuri,
Koiwa Nobuyoshi,
Homma Ikuo
Publication year - 2005
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.2005.086124
Subject(s) - orbitofrontal cortex , neuroscience , olfaction , alpha (finance) , olfactory system , sensory system , entorhinal cortex , electroencephalography , hippocampus , psychology , stimulation , premotor cortex , audiology , medicine , prefrontal cortex , cognition , anatomy , developmental psychology , construct validity , psychometrics , dorsum
Olfactory perception and related emotions are largely dependent on inspiration. We acquired simultaneous respiration and electroencephalographic recordings during pleasant odour and unpleasant odour stimulation. We sought to identify changes in respiratory pattern, inspiratory‐related potentials and location of dipoles estimated from the potentials. Electroencephalographic recording was triggered by inspiration onset. Respiratory frequency decreased at pleasant odour recognition, and it increased at unpleasant odour detection and recognition. O 2 consumption records showed that these changes were not due to metabolic demand. During olfactory stimulation, inspiratory phase‐locked alpha oscillation (I‐α) was found in the averaged potential triggered by inspiration onset. I‐α was observed at both pleasant odour and unpleasant odour detection and recognition, but it was not seen in the inspiration‐triggered potentials of normal air breathing. Electroencephalographic dipole tracing identified the location of dipoles from the I‐α in the limbic area and the cortex; the entorhinal cortex, hippocampus, amygdala, premotor area and centroposterior orbitofrontal cortex subserve odour detection, and the rostromedial orbitofrontal cortex subserves odour recognition. We suggest that the I‐α in our study originated from the olfactory cortex in the forebrain and was phase‐locked to inspiration.