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Related Concept Videos

Olfaction01:25

Olfaction

40.5K
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

Olfactory Receptors: Location and Structure

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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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Implicit Memories01:24

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Implicit memories, also known as non-declarative memories, are long-term memories that function outside of conscious awareness. These memories influence behavior and skills without explicit knowledge. This type of memory is evident in tasks like playing tennis, snowboarding, and texting. Implicit memory has three subsystems: procedural memory, conditioning, and priming. This type of memory is essential in various activities, from everyday tasks to specialized skills.
One key aspect of implicit...
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Related Experiment Video

Updated: May 1, 2026

Olfactory Context Dependent Memory: Direct Presentation of Odorants
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Olfactory Context Dependent Memory: Direct Presentation of Odorants

Published on: September 18, 2018

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Sniffing patterns uncover implicit memory for undetected odors.

Anat Arzi1, Liron Rozenkrantz1, Yael Holtzman1

  • 1Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel.

Current Biology : CB
|April 5, 2014
PubMed
Summary
This summary is machine-generated.

Unconsciously perceived odors can influence sniffing behaviors and are retained in memory for later use. This suggests that the brain processes and stores information even without conscious awareness.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Olfactory Processing

Background:

  • Sensory-motor control processes information from consciously undetected events, influencing actions like eye movements and neural activity.
  • Olfactory research utilizes sniff-response measurements, specifically odorant-driven nasal airflow modulations, to study undetected stimulus processing.

Discussion:

  • This study provides evidence that consciously undetected odorants can modulate sniffing patterns as predicted.
  • Observed sniff-modulations persisted for at least 10 seconds post-odor onset, indicating sustained neural processing.

Key Insights:

  • Subliminal olfactory stimuli significantly impact respiratory behaviors (sniffing).
  • Information from undetected odors is maintained in memory for potential future use, demonstrating non-conscious memory functions.

Outlook:

  • Further research can explore the neural mechanisms underlying the maintenance of undetected olfactory information.
  • Investigating the role of non-conscious olfactory processing in decision-making and behavior is crucial.