Imaging of Intrinsic Signals in the Olfactory Cortex and Bulb

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  • 嗅覚中枢(嗅球および梨状皮質)における内因性光信号のイメージング

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By optical imaging of intrinsic signals, we showed one possible code for odor concentrations in two olfactory structures of the guinea-pig. Odor-specific domains appeared in the olfactory bulb and new glomerular units were recruited by increasing concentrations. Odor-induced cortical activation, which primarily originated in layer II, appeared in a narrow band beneath the rhinal sulcus over the lateral olfactory tract, corresponding to the dorsal part of the anterior piriform cortex. Lower concentrations activated the rostral region of the band, whereas higher ones generated caudally spreading activation, and the site at which neural activation reached its maximum extent depended on the odor concentration. Furthermore, the total area activated increased in proportion to concentrations raised to a power of 0.5 to 0.8. Unit recordings indicated a rostro-caudal gradient in odor-sensitivity among cortical neurons. Our results suggest that the dorsal part of the anterior piriform cortex may be associated with odor concentration. Therefore, a rostro-caudal gradient in axonal projections from mitral/tufted cells and/or in association fibers may play an important role in odor-concentration coding in the olfactory cortexr.


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