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Related Concept Videos

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Sodium concentration coding gives way to evaluative coding in cortex and amygdala.

Brian F Sadacca1, Jason T Rothwax, Donald B Katz

  • 1Department of Biology, Brandeis University, Waltham, Massachusetts 02454, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 21, 2012
PubMed
Summary
This summary is machine-generated.

Neural responses in the gustatory cortex and central amygdala reflect both sodium concentration and palatability. The gustatory cortex (GC) shows concentration early and palatability later, while the central amygdala (CeA) shows concentration briefly before palatability.

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Taste perception

Background:

  • Sensory neural coding studies typically use physical parameters, but psychological variables like palatability often dominate neural responses in awake animals.
  • The relationship between physical properties (e.g., NaCl concentration) and psychological perception (e.g., palatability) is complex and can influence neural processing differently.

Purpose of the Study:

  • To investigate whether neural responses in the gustatory cortex (GC) and central amygdala (CeA) better reflect external physical variables (NaCl concentration) or internal psychological variables (palatability).
  • To compare the temporal dynamics of concentration- and palatability-related information processing in the GC and CeA.

Main Methods:

  • Awake rats were presented with a stimulus set including varying NaCl concentrations (0.01, 0.1, 0.3, 1.0 m), a palatable sucrose solution (0.3 m), and an aversive quinine solution (0.001 m).
  • Neuronal activity was recorded in the gustatory cortex (GC) and central amygdala (CeA) during stimulus presentation.

Main Results:

  • Gustatory cortex (GC) neurons showed early responses related to sodium concentration, followed by later responses related to palatability in an overlapping subset of neurons.
  • Central amygdala (CeA) neurons exhibited a brief period of concentration specificity preceding palatability-related information, which emerged simultaneously with or slightly after GC responses.
  • Both GC and CeA prominently reflected NaCl palatability late in their responses, with GC showing graded responses across the palatability spectrum and CeA responding more distinctly to palatable or aversive stimuli.

Conclusions:

  • Both the gustatory cortex and central amygdala process both physical concentration and psychological palatability of taste stimuli.
  • Palatability becomes a dominant factor in neural coding later in the processing streams within both the GC and CeA.
  • The GC exhibits a graded representation of palatability, whereas the CeA shows a more distinct separation of palatable versus aversive stimuli.