Beta and gamma oscillatory activities associated with olfactory memory tasks: different rhythms for different functional networks?
Claire Martin,Nadine Ravel +1 more
TL;DR: In this paper, the authors assess the functional relevance of different types of oscillatory activity observed in the olfactory system of behaving animals and propose hypotheses on the functional involvement of beta and gamma oscillations for odor perception and memory.
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Abstract: Olfactory processing in behaving animals, even at early stages, is inextricable from top down influences associated with odor perception. The anatomy of the olfactory network (olfactory bulb, piriform and entorhinal cortices) and its unique direct access to the limbic system makes it particularly attractive to study how sensory processing could be modulated by learning and memory. Moreover, olfactory structures have been early reported to exhibit oscillatory population activities easy to capture through local field potential recordings. An attractive hypothesis is that neuronal oscillations would serve to ‘bind’ distant structures to reach a unified and coherent perception. In relation to this hypothesis, we will assess the functional relevance of different types of oscillatory activity observed in the olfactory system of behaving animals. This review will focus primarily on two types of oscillatory activities: beta (15-40 Hz) and gamma (60-100 Hz). While gamma oscillations are dominant in the olfactory system in the absence of odorant, both beta and gamma rhythms have been reported to be modulated depending on the nature of the olfactory task. Studies from the authors of the present review and other groups brought evidence for a link between these oscillations and behavioral changes induced by olfactory learning. However, differences in studies led to divergent interpretations concerning the respective role of these oscillations in olfactory processing. Based on a critical reexamination of those data, we propose hypotheses on the functional involvement of beta and gamma oscillations for odor perception and memory.
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Citations
Neural oscillations across olfactory regions encode odorant information in the teleost olfactory system
Oliver Schmachtenberg,fotlanqfrc +1 more
- 16 Apr 2022
TL;DR: In this paper , the authors show that olfactory oscillations are carriers of spatially distributed odor information across the teleost olfactory system and that the relevant feature for discriminating odorant identity is the information conveyed by the oscillatory activity in a spatially-distributed network.
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TL;DR: In this paper, the authors focused on how the brain categorizes odors at specific time intervals, using multivariate electroencephalography (EEG) analysis, and found that similarly perceived odors induced similar EEG signals during 50-100, 150-200, and 350-400 milliseconds at the theta frequency.
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Changes in the spectral characteristics and the coherence of the rat olfactory bulb local field potentials under xylazine-tiletamine-zolazepam anesthesia
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Odor-induced modification of oscillations and related theta-higher gamma coupling in olfactory bulb neurons of awake and anesthetized rats
TL;DR: The obtained results indicate that LFP oscillations including HGOs and HFOs were differently modified by odor stimulation in animals of both states and it is suggested that these oscillations and their interactions with theta oscillations may play crucial roles in olfactory network activity.
2
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•Journal Article
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