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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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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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Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

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Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
Biological Factors in Depression
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Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

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Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
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Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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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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Depression: Overview01:18

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Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
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Updated: Mar 15, 2026

An Olfactory Preference Test for Measuring Olfactory Hedonic Biases in Mouse Models of Depression
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[Olfaction in depressive disorders: Issues and perspectives].

G Brand1, B Schaal2

  • 1Département neurosciences, université de Bourgogne-Franche-Comté, place Leclerc, 25000 Besançon, France; Centre des sciences du goût et de l'alimentation, CNRS, laboratoire d'éthologie développementale et de psychologie cognitive, université de Bourgogne-Franche-Comté (UMR 6265), 9E, boulevard Jeanne-d'Arc, 21000 Dijon, France.

L'Encephale
|September 14, 2016
PubMed
Summary
This summary is machine-generated.

Olfactory dysfunction is linked to major depression, potentially aiding diagnosis and treatment. Restoring sense of smell may improve mood and understanding of depression mechanisms.

Keywords:
Bipolar disorderDiagnosisDiagnosticMajor depressionOlfactionOlfactory sensitivitySensibilité olfactiveTrouble bipolaireÉpisode dépressif caractérisé

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Sensory Science

Background:

  • Depression research often overlooks olfaction, focusing on visual/auditory senses.
  • The etiology of depression is complex, involving genetic, neurochemical, and stress factors.
  • Olfactory pathways connect to brain regions crucial for mood and emotion regulation.

Purpose of the Study:

  • To review recent literature on the interaction between olfaction and depression.
  • To explore olfaction's role in depression diagnosis, mechanisms, and potential therapeutic interventions.

Main Methods:

  • Review of published scientific papers on olfaction and depression.
  • Analysis of findings related to olfactory sensitivity changes in depression.
  • Examination of animal models and odor-based therapeutic approaches.

Main Results:

  • Decreased olfactory sensitivity is observed in major depression, unlike bipolar or seasonal depression.
  • Olfactory deficits may contribute to the development of depressive symptoms.
  • Odors show potential for positively impacting depressive mood and may offer a new therapeutic avenue.

Conclusions:

  • Olfaction represents a significant, underexplored area for understanding and treating depression.
  • Further research into olfactory dysfunction and odor-based therapies could enhance diagnostic accuracy and treatment efficacy for depression.