Independent control of gamma and theta activity by distinct interneuron networks in the olfactory bulb
By I. Fukunaga, J. Herb, M. Kollo, Ed Boyden, Andreas T. Schaefer. 2014
188 citations recorded by the source corpus.
Circuits in the brain possess the ability to orchestrate activities on different timescales, but the manner in which distinct circuits interact to sculpt diverse rhythms remains unresolved. The olfactory bulb is a classic example of a place in which slow theta and fast gamma rhythms coexist. Furthermore, inhibitory interneurons that are generally implicated in rhythm generation are segregated into distinct layers, neatly separating local and global motifs. We combined intracellular recordings in vivo with circuit-specific optogenetic interference to examine the contribution of inhibition to rhythmic activity in the mouse olfactory bulb. We found that the two inhibitory circuits controlled rhythms on distinct timescales: local, glomerular networks coordinated theta activity, regulating baseline and odor-evoked inhibition, whereas granule cells orchestrated gamma synchrony and spike timing. Notably, granule cells did not contribute to baseline rhythms or sniff-coupled odor-evoked inhibition. Thus, activities on theta and gamma timescales are controlled by separate, dissociable inhibitory networks in the olfactory bulb.
Subfields: Cellular and Molecular Neuroscience, Cognitive Neuroscience, Sensory Systems
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Citations in the corpus
- Re-evaluating circuit mechanisms underlying pattern separation (2019, neutral): “, 2014), and feedforward inhibition within the glomerulus regulates slower sniff-coupled odour-evoked inhibition (Fukunaga et al., 2014).”
- Adult-born neurons facilitate olfactory bulb pattern separation during task engagement (2018, unknown): “The sensitivity to task engagement may explain the findings from a previous study that broad GC inactivation has only mild effects on MC responses under anesthesia and passive wakefulness (Fukunaga et al., 2014).”
- Inhibitory circuits of the mammalian main olfactory bulb. (2017, background): “2C) (Fukunaga et al. 2014) and the functional properties of PGCs, compellingly argues that PGCs significantly contribute to the odor-evoked suppression of M/TC firing.”