Lateralization of olfactory processes.
Over the last ten years, methods of cerebral imaging have revolutionized our knowledge of cognitive processes in humans. An impressive number of papers dealing with cerebral imaging for olfaction have been published to date. Whereas the early works revealed those structures participating in the processing of odours presented passively to subjects, researchers later recorded brain activity when subjects performed specific olfactory tasks based on memory, emotion and identification. From these results, we suggest that there is a dissociation of olfactory processes, with involvement of the right hemisphere in memory processes and the left hemisphere in emotional processes. The review concludes with a summary of how these lateralized processes are consistent with the gestalt-nature of our olfactory perception.
Royet
Jean-Pierre
JP
Neurosciences and Sensory Systems, Claude-Bernard University, Lyon 1, CNRS UMR 5020, IFR 19, Institut Fédératif des Neurosciences, 69366 Lyon cedex 7, France. royet@olfac.univ-lyon1.fr.
Plailly
Jane
J
D000679:Amygdala / Q000033:anatomy & histology / Q000502:physiology*; D002540:Cerebral Cortex / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000502:physiology; D055590:Electromagnetic Phenomena / Q000379:methods; D005625:Frontal Lobe / Q000033:anatomy & histology / Q000502:physiology*; D006801:Humans; D008568:Memory; D009833:Olfactory Pathways / Q000033:anatomy & histology* / Q000502:physiology*; D011877:Radionuclide Imaging; D012903:Smell / Q000502:physiology*