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Related Concept Videos

The Physiology of Taste01:24

The Physiology of Taste

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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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.
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Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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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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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Gustatory thalamic neurons mediate aversive behaviors.

Feng Cao1,2,3, Sekun Park4,5, Jordan L Pauli4,5

  • 1Howard Hughes Medical Institute, University of Washington, Seattle, WA, USA. feng.cao@wwu.edu.

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|September 26, 2025
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The gustatory thalamus (VPMpc) transmits taste signals and mediates aversive behaviors. This study reveals VPMpc neurons expressing cholecystokinin and mu-opioid receptors are crucial for processing noxious stimuli and fear memories.

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Area of Science:

  • Neuroscience
  • Sensory Systems
  • Behavioral Science

Background:

  • The parvicellular part of the ventral posteromedial nucleus (VPMpc), or gustatory thalamus, traditionally relays taste information.
  • Previous research primarily focused on the VPMpc's role in transmitting taste signals to the gustatory cortex.

Purpose of the Study:

  • To investigate the role of VPMpc neurons beyond taste perception.
  • To determine if VPMpc mediates aversive behaviors and fear memory.

Main Methods:

  • In vivo calcium imaging of single neurons in mice.
  • Recording neuronal activity in response to noxious stimuli and fear memory.
  • Chemogenetic and optogenetic manipulation of VPMpc neuronal activity.

Main Results:

  • VPMpc neurons expressing cholecystokinin and mu-opioid receptors respond to noxious stimuli and fear memory.
  • Activation of these VPMpc neurons enhanced responses to aversive stimuli.
  • Silencing these neurons attenuated aversive behaviors.

Conclusions:

  • The VPMpc plays a significant role in mediating aversive behaviors, not just taste sensation.
  • VPMpc neurons transmit aversive and threatening signals to the insular cortex and lateral amygdala.
  • This expands the known function of the gustatory thalamus in threat processing.