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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Conditioned Taste Aversion01:14

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Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
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Role of Amygdala in Memory01:16

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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Physiology of Smell and Olfactory Pathway01:20

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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Negative valence encoding in the lateral entorhinal cortex during aversive olfactory learning.

Penglai Liu1, Cheng Gao1, Jing Wu1

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The lateral entorhinal cortex (LEC) is crucial for acquiring negative odor value during fear conditioning, while the posterior piriform cortex (PPC) aids memory recall. Specific LEC neurons are key to encoding and recalling fear memories.

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CP: Neuroscience

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Area of Science:

  • Neuroscience
  • Olfactory Learning
  • Fear Conditioning

Background:

  • Olfactory learning is vital for animal survival, but the specific brain regions and their functions during learning are not fully understood.
  • The lateral entorhinal cortex (LEC) and posterior piriform cortex (PPC) are key olfactory processing areas.

Purpose of the Study:

  • To investigate the roles of the LEC and PPC in aversive olfactory learning.
  • To elucidate the function of LEC CaMKIIα+ neurons in fear encoding and memory retrieval.

Main Methods:

  • Aversive olfactory fear conditioning in animal models.
  • Inhibition of specific neuronal populations (LEC CaMKIIα+ neurons).
  • Electrophysiological recordings of PPC responses.

Main Results:

  • The LEC is essential for acquiring negative odor value during olfactory fear conditioning.
  • The PPC plays a critical role in the memory-retrieval phase of olfactory fear memories.
  • Inhibiting LEC CaMKIIα+ neurons impaired fear encoding, memory recall, and altered PPC responses to conditioned odors.

Conclusions:

  • LEC CaMKIIα+ neurons are directly involved in encoding negative valence associated with odors.
  • Distinct roles for LEC and PPC in different stages of aversive olfactory learning and memory.