Dissociable codes of odor quality and odorant structure in human piriform cortex

Jay A. Gottfried*, Joel S. Winston, Raymond J. Dolan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

161 Scopus citations


The relationship between odorant structure and odor quality has been a focus of olfactory research for 100 years, although no systematic correlations are yet apparent. Animal studies suggest that topographical representations of odorant structure in olfactory bulb form the perceptual basis of odor quality. Whether central olfactory regions are similarly organized is unclear. Using an olfactory version of fMRI cross-adaptation, we measured neural responses in primary olfactory (piriform) cortex as subjects smelled pairs of odorants systematically differing in quality and molecular functional group (as one critical attribute of odorant structure). Our results indicate a double dissociation in piriform cortex, whereby posterior regions encode quality (but not structure) and anterior regions encode structure (but not quality). The presence of structure-based codes suggests fidelity of sensory information arising from olfactory bulb. In turn, quality-based codes are independent of any simple structural configuration, implying that synthetic mechanisms may underlie our experience of smell.

Original languageEnglish (US)
Pages (from-to)467-479
Number of pages13
Issue number3
StatePublished - Feb 2 2006
Externally publishedYes

ASJC Scopus subject areas

  • Neuroscience(all)


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