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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.
The olfactory receptors are embedded in the cilia of the...
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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.
The olfactory...
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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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Motor and Sensory Areas of the Cortex01:14

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Somatosensation01:33

Somatosensation

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Related Experiment Video

Updated: Sep 29, 2025

A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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Top-down feedback enables flexible coding strategies in the olfactory cortex.

Zhen Chen1, Krishnan Padmanabhan2

  • 1Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY 14627, USA.

Cell Reports
|March 23, 2022
PubMed
Summary
This summary is machine-generated.

Top-down feedback in the olfactory bulb controls how odors are encoded in the brain. This mechanism allows the olfactory system to dynamically switch between neural coding strategies for improved odor discrimination.

Keywords:
Neurosciencecentrifugal feedbackcombinatorial codeolfactionolfactory bulbpiriform cortextemporal codetop-down

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Sensory Systems

Background:

  • The olfactory cortex employs various models to represent odor information, including combinatorial neural identity and temporal activity structure.
  • Understanding the mechanisms that govern these olfactory coding strategies is crucial for deciphering chemical sensation.

Purpose of the Study:

  • To investigate the role of top-down feedback to the main olfactory bulb in shaping olfactory information processing.
  • To determine how this feedback influences the coding strategies used in the piriform cortex.

Main Methods:

  • Utilized a detailed network model of the olfactory system.
  • Simulated the effects of feedback control of inhibition on mitral cells and piriform cortical neurons.
  • Assessed performance in odor discrimination tasks under different feedback conditions.

Main Results:

  • Top-down feedback to the main olfactory bulb dictates information flow to the piriform cortex.
  • This feedback dynamically switches between combinatorial and temporal neural coding strategies.
  • Modulation of the excitation-inhibition balance in mitral cells by feedback enhances odor discrimination performance.

Conclusions:

  • Top-down feedback to the olfactory bulb provides a flexible mechanism for early olfactory computation.
  • This feedback reshapes neural activity dynamics in the piriform cortex, enabling dynamic switching between coding models.
  • The findings offer a framework for understanding how the olfactory system adapts its coding strategies for efficient odor processing.