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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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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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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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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Related Experiment Video

Updated: Jun 9, 2025

Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Bilateral Alignment of Receptive Fields in the Olfactory Cortex.

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  • 1Molecules, Cells, and Organisms Graduate Program, Harvard University, Cambridge, Massachusetts 02138.

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Researchers discovered that olfactory cortical neurons in mice show correlated odor responses between hemispheres. This coordination allows for effective odor identity decoding and suggests Hebbian plasticity shapes bilateral connectivity.

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Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Sensory Integration

Background:

  • The olfactory cortex (OC) receives direct ipsilateral and indirect contralateral odor information.
  • Neural projections to the OC are disordered and nontopographic, preventing spatial alignment of bilateral inputs.
  • The mechanism of bilateral odor information integration in individual cortical neurons remains unknown.

Purpose of the Study:

  • To investigate how bilateral odor information is integrated in individual olfactory cortical neurons.
  • To determine if odor responses are correlated between the two olfactory cortical hemispheres.
  • To explore the role of neural plasticity in structuring bilateral connectivity.

Main Methods:

  • Utilized selective stimulation of each nostril in mice.
  • Recorded odor responses from individual olfactory cortical neurons.
  • Performed computational analysis of neural response correlations and decoding.

Main Results:

  • Individual olfactory cortical neurons exhibit significantly correlated odor responses to stimulation of either nostril.
  • Odor identity decoding optimized for one nostril's input transfers effectively to the other.
  • Neural responses are asymmetric, enabling decoding of stimulus laterality.
  • Matched odor tuning is explained by Hebbian plasticity, not random connections.

Conclusions:

  • Despite a distributed sensory representation, odor information is highly coordinated across olfactory cortical hemispheres.
  • Hebbian plasticity plays a crucial role in organizing bilateral connectivity in the olfactory cortex.
  • This coordinated processing facilitates robust odor perception and laterality discrimination.