Piriform Cortex and Olfactory Tubercle

Mori, Kensaku

doi:10.1007/978-4-431-54376-3_8

Cited by 2 publications

(4 citation statements)

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“…As a component of the ventral striatum, it is crucially involved in motivated behaviors ( Millhouse and Heimer, 1984 ; Ikemoto, 2007 ; Wesson and Wilson, 2011 ; Mori, 2014 ). Electrical self-stimulation of the OT is rewarding in rats ( Prado-Alcalá and Wise, 1984 ; Fitzgerald et al, 2014 ).…”

Section: The Olfactory Tubercle As a Regulator Of Motivated Olfactory...mentioning

confidence: 99%

“…The olfactory cortex (OC) can be subdivided into areas with distinct structural and functional properties ( Neville and Haberly, 2004 ). The olfactory tubercle (OT) is a component of both the OC and the ventral striatum with medium spiny neurons as its principal neurons; it receives massive dopamine signals from the midbrain ( Millhouse and Heimer, 1984 ; Ikemoto, 2007 ; Wesson and Wilson, 2011 ; Mori, 2014 ). Accordingly, it is involved in odor-guided motivated behaviors, particularly in adaptive learning ( Ikemoto, 2007 ; Wesson and Wilson, 2011 ; Wesson, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Connectivity of the olfactory tubercle: inputs, outputs, and their plasticity

Yamaguchi

2024

Front. Neural Circuits

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The olfactory tubercle (OT) is a unique part of the olfactory cortex of the mammal brain in that it is also a component of the ventral striatum. It is crucially involved in motivational behaviors, particularly in adaptive olfactory learning. This review introduces the basic properties of the OT, its synaptic connectivity with other brain areas, and the plasticity of the connectivity associated with learning behavior. The adaptive properties of olfactory behavior are discussed further based on the characteristics of OT neuronal circuits.

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Section: The Olfactory Tubercle As a Regulator Of Motivated Olfactory...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Connectivity of the olfactory tubercle: inputs, outputs, and their plasticity

Yamaguchi

2024

Front. Neural Circuits

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“…The OC is not a six-layered neocortex but a three-layered paleocortex. The OC belongs to the limbic system and forms massive reciprocal connections with various brain areas, including the amygdala and prefrontal cortex (PFC; Shipley and Ennis, 1996 ; Haberly, 2001 ; Illig, 2005 ; Mori, 2014 ). The OC is thus regarded as an association cortex which integrates odor inputs and other neuronal activities within the brain.…”

Section: Association Of Odor Identity and Odor Value In The Olfactorymentioning

confidence: 99%

“…This notion fits with the observation that glutamatergic centrifugal projection to the OB regulates food intake behavior under the control of endocannabinoid signaling (Soria-Gómez et al, 2014 ). Given that the OC receives synaptic inputs from the amygdala and PFC (Haberly, 2001 ; Illig, 2005 ; Mori, 2014 ), the activity of OC neurons might be entrained to a positive or negative value via the inputs from these brain areas. Simultaneous analysis of the amygdala and PFC might reveal whether the PC integrates odor identity and odor value.…”

Section: Olfactory Bulb Integrates Peripheral Odor Inputs and Centralmentioning

confidence: 99%

Functional Sub-Circuits of the Olfactory System Viewed from the Olfactory Bulb and the Olfactory Tubercle

Yamaguchi

2017

Front. Neuroanat.

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Understanding of the olfactory neural circuits has progressed beyond analysis of how odor information from the external environment is processed in the brain. While spatially-organized sub-circuits were found to exist up to the olfactory bulb (OB), the arrangement in the olfactory cortex (OC), especially in its representative piriform cortex (PC), appears diffuse and dispersed. An emerging view is that the activity of OC neurons may not simply encode odor identity but rather encode plastic odor information such as odor value. Although many studies support this notion, odor value can be either positive or negative, and the existence of sub-circuits corresponding to individual value types is not well explored. To address this question, I introduce here two olfactory areas other than the PC, OB and olfactory tubercle (OT) whose analysis may facilitate understanding of functional sub-circuits related to different odor values. Peripheral and centrifugal inputs to the OB are considered to relate to odor identity and odor value, respectively and centrifugal inputs to the OB potentially represent different odor values during different behavioral periods. The OT has spatially-segregated functional domains related to distinct motivated and hedonic behaviors. Thus, the OT provides a good starting point from which functional sub-circuits across various olfactory regions can be traced. Further analysis across wide areas of the olfactory system will likely reveal the functional sub-circuits that link odor identity with distinct odor values and direct distinct odor-induced motivated and hedonic behaviors.

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Piriform Cortex and Olfactory Tubercle

Cited by 2 publications

References 47 publications

Connectivity of the olfactory tubercle: inputs, outputs, and their plasticity

Connectivity of the olfactory tubercle: inputs, outputs, and their plasticity

Functional Sub-Circuits of the Olfactory System Viewed from the Olfactory Bulb and the Olfactory Tubercle

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