Learning-dependent and-independent enhancement of mitral/tufted cell glomerular odor responses following olfactory fear conditioning in awake mice

Jordan M. Ross, Max Fletcher

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Associative fear learning produces fear toward the conditioned stimulus (CS) and often generalization, the expansion of fear from the CS to similar, unlearned stimuli. However, how fear learning affects early sensory processing of learned and unlearned stimuli in relation to behavioral fear responses to these stimuli remains unclear. We subjected male and female mice expressing the fluorescent calcium indicator GCaMP3 in olfactory bulb mitral and tufted cells to a classical olfactory fear conditioning paradigm. We then used awake, in vivo calcium imaging to quantify learning-induced changes in glomerular odor responses, which constitute the first site of olfactory processing in the brain. The results demonstrate that odor-shock pairing nonspecifically enhances glomerular odor representations in a learning-dependent manner and increases representational similarity between the CS and nonconditioned odors, potentially priming the system toward generalization of learned fear. Additionally, CS-specific glomerular enhancements remain even when associative learning is blocked, suggesting two separate mechanisms lead to enhanced glomerular responses following odor-shock pairings.

Original languageEnglish (US)
Pages (from-to)4623-4640
Number of pages18
JournalJournal of Neuroscience
Volume38
Issue number20
DOIs
StatePublished - May 16 2018

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Fear
Learning
Shock
Stimulus Generalization
Calcium
Olfactory Bulb
Odorants
Conditioning (Psychology)
Brain

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

Cite this

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title = "Learning-dependent and-independent enhancement of mitral/tufted cell glomerular odor responses following olfactory fear conditioning in awake mice",
abstract = "Associative fear learning produces fear toward the conditioned stimulus (CS) and often generalization, the expansion of fear from the CS to similar, unlearned stimuli. However, how fear learning affects early sensory processing of learned and unlearned stimuli in relation to behavioral fear responses to these stimuli remains unclear. We subjected male and female mice expressing the fluorescent calcium indicator GCaMP3 in olfactory bulb mitral and tufted cells to a classical olfactory fear conditioning paradigm. We then used awake, in vivo calcium imaging to quantify learning-induced changes in glomerular odor responses, which constitute the first site of olfactory processing in the brain. The results demonstrate that odor-shock pairing nonspecifically enhances glomerular odor representations in a learning-dependent manner and increases representational similarity between the CS and nonconditioned odors, potentially priming the system toward generalization of learned fear. Additionally, CS-specific glomerular enhancements remain even when associative learning is blocked, suggesting two separate mechanisms lead to enhanced glomerular responses following odor-shock pairings.",
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AU - Fletcher, Max

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