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Related Concept Videos

Olfaction01:25

Olfaction

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...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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...
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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Related Experiment Video

Updated: May 21, 2026

New Methods to Study Gustatory Coding
10:59

New Methods to Study Gustatory Coding

Published on: June 29, 2017

Odor representations in olfactory cortex: distributed rate coding and decorrelated population activity.

Keiji Miura1, Zachary F Mainen, Naoshige Uchida

  • 1Center for Brain Science, Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.

Neuron
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

Neural activity in the anterior piriform cortex (aPC) guides odor decisions. Odor identity is decoded using spike counts from transient neuronal bursts, with low noise correlations suggesting downstream performance limits.

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Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits

Published on: January 25, 2013

Area of Science:

  • Neuroscience
  • Olfactory processing
  • Sensory decision-making

Background:

  • Understanding how neuronal spike trains encode information for sensory decisions is crucial.
  • Olfactory decisions rely on neural representations that are not fully understood.
  • A single sniff enables fine odor discrimination.

Purpose of the Study:

  • To investigate neural ensemble activity in the anterior piriform cortex (aPC) during odor discrimination.
  • To determine how odor information is represented and decoded in the aPC.
  • To explore the relationship between neural activity and behavioral performance in olfactory tasks.

Main Methods:

  • Recorded neural ensemble activity in the anterior piriform cortex (aPC) of rats.
  • Utilized an odor mixture categorization task.
  • Analyzed spike counts, latencies, and temporal patterns of neuronal firing.
  • Measured noise correlations in aPC ensembles during odor stimulation.

Main Results:

  • Odors evoked transient bursts of neural activity locked to sniff onset.
  • Odor identity was best decoded using burst spike counts, outperforming spike latencies and temporal patterns.
  • aPC ensembles showed near-zero noise correlations during odor stimulation.
  • Fewer than 100 aPC neurons were sufficient to account for behavioral speed and accuracy.

Conclusions:

  • Neural representations in the aPC undergo dynamic transformations from the olfactory bulb.
  • Burst spike counts are a key feature for decoding odor identity in the aPC.
  • Low noise correlations in the aPC suggest that performance limitations in odor-guided decisions occur downstream.
  • The findings reveal potential neural substrates for odor-guided decision-making.