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Related Concept Videos

Association Areas of the Cortex01:21

Association Areas of the Cortex

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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:
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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
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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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Olfaction01:25

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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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Anatomy of the Brain: Major Regions01:20

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The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
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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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Related Experiment Video

Updated: Jan 17, 2026

Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Distinct brain regions map olfactory and visual spaces.

Heydar Davoudi1, Jason R Climer1,2, John B Issa1

  • 1Department of Neurobiology, Northwestern University, Evanston, IL, USA.

Biorxiv : the Preprint Server for Biology
|September 18, 2025
PubMed
Summary
This summary is machine-generated.

The hippocampus integrates sensory information, but how it forms a combined spatial map is unclear. Researchers found distinct brain regions map olfactory and visual spaces independently before reaching the hippocampus.

Keywords:
Entorhinal cortexHippocampusMultisensory navigationOlfactionPlace cellVisiontwo-photon imagingvirtual reality

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Spatial Navigation

Background:

  • The hippocampus forms a multisensory cognitive map integrating spatial cues from vision and olfaction.
  • The transformation of primary sensory information into this combined map within hippocampal pathways remains largely unknown.
  • Key questions involve whether the hippocampus generates or inherits this multisensory spatial map.

Purpose of the Study:

  • To investigate how the lateral and medial entorhinal cortices (LEC and MEC), major hippocampal inputs, map olfactory and visual sensory spaces.
  • To determine if these entorhinal cortices generate modality-specific spatial maps.
  • To understand the origins of the hippocampus's multisensory spatial representation.

Main Methods:

  • Utilized multisensory virtual reality environments for navigating mice.
  • Employed large-scale functional imaging techniques to monitor neural activity.
  • Analyzed the spatial mapping properties of the lateral and medial entorhinal cortices.

Main Results:

  • The lateral entorhinal cortex (LEC) preferentially maps olfactory space.
  • The medial entorhinal cortex (MEC) preferentially maps visual space.
  • These modality-specific mappings occurred independently of behavioral relevance.

Conclusions:

  • The brain maintains largely independent neural maps for different sensory spaces.
  • The hippocampus likely constructs its multisensory cognitive map by integrating these distinct, modality-specific maps from the entorhinal cortices.
  • This suggests a hierarchical processing of sensory information for spatial cognition.