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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...
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...
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...
Association Areas of the Cortex01:21

Association Areas of the Cortex

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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Facial Feedback Hypothesis01:24

Facial Feedback Hypothesis

Charles Darwin proposed that facial expressions are an evolutionary adaptation for communication. He argued that these expressions are not influenced by culture but are universal across species. For example, a snarling expression with exposed teeth signals a threat in many animals, including humans. Darwin also suggested that displaying an emotion can intensify the feeling. Smiling, for example, could enhance one's sense of happiness. This idea laid the foundation for understanding the role of...
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Related Experiment Video

Updated: Jul 9, 2026

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity
06:13

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity

Published on: January 19, 2024

Olfaction and its dynamic influence on word and face processing: cross-modal integration.

Peter Walla1

  • 1Biological Psychology Unit, University of Vienna, Faculty of Psychology, Institute for Clinical, Biological and Differential Psychology, Liebiggasse 5, 1010 Vienna, Austria. peter.walla@univie.ac.at

Progress in Neurobiology
|December 8, 2007
PubMed
Summary

Subconscious odors impact the human brain, influencing memory and cognition. Conscious odors can interfere with language and face processing, highlighting complex olfactory cross-modal interactions.

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Related Experiment Videos

Last Updated: Jul 9, 2026

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity
06:13

Combining a Breath-Synchronized Olfactometer with Brain Simulation to Study the Impact of Odors on Corticospinal Excitability and Effective Connectivity

Published on: January 19, 2024

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
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Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

Published on: June 29, 2021

A Free-breathing fMRI Method to Study Human Olfactory Function
10:42

A Free-breathing fMRI Method to Study Human Olfactory Function

Published on: July 30, 2017

Area of Science:

  • Neuroscience
  • Sensory Perception
  • Cognitive Science

Background:

  • The human sense of smell (olfaction) plays a complex role in brain function.
  • Olfactory stimuli can influence cognitive processes even without conscious awareness.
  • Sensory interactions between olfaction and other modalities like vision, language, and face processing are not fully understood.

Purpose of the Study:

  • To investigate the temporal dynamics of olfactory processing in the human brain.
  • To explore cross-modal interactions between olfaction and other sensory and cognitive functions.
  • To determine the influence of conscious versus subconscious odor perception on cognitive tasks.

Main Methods:

  • Electrophysiological methods with high temporal resolution were employed.
  • Stimulus onset timing was precisely controlled to differentiate processing stages.
  • Cognitive tasks involving language and face processing were used to assess interactions.

Main Results:

  • Two distinct olfactory processing stages were identified: an early subconscious stage (~300 ms) and a later conscious stage (~700 ms).
  • Subconscious odor processing can enhance memory formation in other modalities, independent of odor valence.
  • Conscious odors can impair simultaneous language and face processing.

Conclusions:

  • Olfactory information is processed through distinct subconscious and conscious pathways.
  • Cross-modal interactions reveal that olfactory processing influences other cognitive domains.
  • Findings support the existence of modality-independent semantic representations (meta-representations) crucial for cognition.