Related Experiment Video
Updated: Jul 16, 2025
10:59
New Methods to Study Gustatory Coding
Published on: June 29, 2017
9.4K
Inhibitory Gating of Thalamocortical Inputs onto Rat Gustatory Insular Cortex
Melissa S Haley1, Alfredo Fontanini1,2,3, Arianna Maffei4,2,3
1Department of Neurobiology and Behavior, Stony Brook University, Stony Brook, New York 11794.
Summary
The gustatory thalamus (VPMpc) broadly activates the gustatory cortex (GC), with synapses showing unique properties and inhibitory modulation, revealing complex taste information processing in thalamocortical circuits.
Area of Science:
- Neuroscience
- Sensory processing
- Thalamocortical circuits
Background:
- The primary gustatory cortex (GC) processes taste information, receiving input from the gustatory thalamus (VPMpc).
- Previous studies suggest VPMpc broadly activates GC, but its synaptic organization and modulation by inhibition remain uncharacterized.
Purpose of the Study:
- To investigate the synaptic properties and organization of VPMpc afferents in GC.
- To explore how cortical inhibition modulates VPMpc-GC synaptic responses.
Main Methods:
- Optogenetic activation of VPMpc afferents in acute rat GC slices.
- Electrophysiological recordings to assess synaptic responses.
- Investigation of GABAergic modulation of VPMpc terminals.
Main Results:
- VPMpc-GC synapses are distributed across GC layers and exhibit frequency-dependent short-term plasticity.
- Synaptic responses are modulated by VPMpc activity patterns and cortical inhibition via GABAA and GABAB receptors.
- These properties differ from typical sensory thalamocortical circuits.
Conclusions:
- The VPMpc-GC circuit possesses unique features, distinct from other sensory thalamocortical pathways.
- Cortical inhibition plays a crucial role in gating and modulating taste information flow to GC.
- This study provides novel insights into the synaptic mechanisms underlying taste perception.
Related Concept Videos
01:24The Physiology of Taste
4.0K
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...
4.0K
01:43Gustation
48.2K
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.
48.2K
01:20Taste Buds and Receptors
2.2K
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,...
2.2K
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.3K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.3K
01:21G-Protein Gated Ion Channels
4.6K
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
Sensory...
4.6K