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Time course of odorant- and trigeminal-induced activation in the human brain: an event-related functional magnetic resonance imaging study.
Billot, P-E; Comte, A; Galliot, E; Andrieu, P; Bonnans, V; Tatu, L; Gharbi, T; Moulin, T; Millot, J-L.
Affiliation
  • Billot PE; Laboratoire de Neurosciences Intégratives et Cliniques, Université de Franche-Comté, 2 Place Leclerc, 25030 Besançon Cedex, France.
Neuroscience ; 189: 370-6, 2011 Aug 25.
Article in En | MEDLINE | ID: mdl-21620934
ABSTRACT
It is well known that most odorants stimulate the trigeminal system but the time course of the brain regions activated by these chemical stimulations remains poorly documented, especially regarding the trigeminal system. This functional magnetic resonance imaging (fMRI) study compares brain activations resulting from the contrast between two odorant conditions (one bimodal odor and one relatively pure olfactory stimulant) according to the duration of the stimulation (i.e. one inhalation, or three or six successive inhalations). The results show striking differences in the main brain regions activated according to these durations. The caudate nucleus and the orbitofrontal cortex are only involved in short-duration stimulations, and the posterior insular cortex and post-central gyrus (SI) are only activated by long duration stimulations. Different regions of the frontal, temporal and occipital lobe are activated depending on the duration but mainly during medium-duration stimulations. These results expand on the findings of previous studies and contribute to the description of temporal networks in trigeminal perception.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Trigeminal Nuclei / Brain / Odorants Limits: Adult / Female / Humans / Male Language: En Journal: Neuroscience Year: 2011 Document type: Article Affiliation country: France

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Trigeminal Nuclei / Brain / Odorants Limits: Adult / Female / Humans / Male Language: En Journal: Neuroscience Year: 2011 Document type: Article Affiliation country: France
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