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Related Concept Videos

Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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...
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...
Gustation01:43

Gustation

Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...
Introduction to Special Senses01:26

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.

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Automated Multimodal Stimulation and Simultaneous Neuronal Recording from Multiple Small Organisms
08:28

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Published on: March 3, 2023

Dual processing streams in chemosensory perception.

Johannes Frasnelli1, Johan N Lundström, Veronika Schöpf

  • 1Centre de Recherche en Neuropsychologie et Cognition, Université de Montréal Montréal, QC, Canada ; Department of ENT-Medicine, Technical University of Dresden Dresden, Germany.

Frontiers in Human Neuroscience
|October 24, 2012
PubMed
Summary
This summary is machine-generated.

Higher order sensory processing, including smell, involves distinct ventral and dorsal brain streams for identification and localization. This study confirms this dual-stream principle in humans for chemical senses.

Keywords:
dorsalgeneral linear modelindependent component analysisolfactiontrigeminal systemventral

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Area of Science:

  • Neuroscience
  • Sensory Processing
  • Olfactory System

Background:

  • Higher-order sensory information is processed via distinct ventral (identification) and dorsal (localization) streams in visual, auditory, and tactile systems.
  • Object identification typically involves temporal lobe structures (ventral stream), while object localization activates parietal structures (dorsal stream).

Purpose of the Study:

  • To investigate whether the chemical senses, specifically olfaction, exhibit a similar ventral-dorsal stream dissociation for odor identification and localization.
  • To explore the neuroanatomical basis of odor processing using functional magnetic resonance imaging (fMRI).

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to study 16 healthy young adults performing odor identification and odor localization tasks.
  • Two distinct odors were presented to a single nostril.
  • General Linear Model (GLM) and Independent Component Analysis (ICA) were employed to analyze brain activation patterns.

Main Results:

  • Both GLM and ICA revealed differences between odor identification and localization tasks, supporting a dual processing stream for chemical senses.
  • Odor localization activated the left intraparietal sulcus and right superior frontal sulcus (GLM), and the left parietal lobe and right hippocampus (ICA).
  • Odor identification showed activation in the left central fissure and left superior frontal gyrus (ICA), with no significant findings for this task using GLM.

Conclusions:

  • Higher-order chemosensory processing demonstrates a subdivision into ventral and dorsal streams, mirroring other sensory systems.
  • This suggests that the ventral-dorsal processing stream is a fundamental organizational principle across different sensory modalities, not limited to vision, audition, or touch.