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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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Related Experiment Video

Updated: Apr 30, 2026

Olfactory Context Dependent Memory: Direct Presentation of Odorants
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Olfactory short-term memory encoding and maintenance - an event-related potential study.

Steffen Lenk1, Annet Bluschke1, Christian Beste1

  • 1Department of Child and Adolescent Psychiatry, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.

Neuroimage
|May 13, 2014
PubMed
Summary
This summary is machine-generated.

Short-term olfactory memory shows brain activation patterns similar to vision and hearing. Specific frontotemporal activity during encoding and frontocentral activation during maintenance suggest a supramodal memory system.

Keywords:
Hemispheric lateralisationOdour memoryOlfactory event-related potentialsOlfactory processingShort-term memorySlow cortical potentials

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Processing

Background:

  • Olfactory stimuli processing and memory are less understood compared to visual and auditory systems.
  • The neurophysiological underpinnings of olfactory short-term memory require further investigation.
  • Working memory models often focus on verbal and visual information, with limited exploration of olfactory components.

Purpose of the Study:

  • To investigate neurophysiological activation patterns during olfactory memory encoding and short-term maintenance.
  • To determine if olfactory memory processing parallels activation patterns seen in other sensory modalities.
  • To explore the potential existence of an 'olfactory flacon' within existing working memory frameworks.

Main Methods:

  • Examined olfactory event-related potentials (oERPs) in 24 healthy adults during an olfactory change detection task.
  • Compared brain activation during an active memory task versus passive olfactory stimulation.
  • Analyzed sustained negativity over frontotemporal areas and frontocentral activation during memory maintenance.

Main Results:

  • Passive olfactory stimulation showed sustained negativity over bilateral frontotemporal areas.
  • This negativity was enhanced during the active olfactory memory task.
  • Sustained frontocentral activation was observed during the memory maintenance interval, correlating with correct behavioral responses.

Conclusions:

  • Olfactory short-term memory involves activation sequences analogous to other sensory modalities.
  • Olfactory-specific frontotemporal activations occur during memory encoding.
  • Frontocentral slow cortical potentials during maintenance suggest a supramodal memory system, potentially supporting an 'olfactory flacon'.