Scientific article

Internal body state influences topographical plasticity of sensory representations in the rat gustatory cortex

Publication date2008

Primary sensory cortices are remarkably organized in spatial maps according to specific sensory features of the stimuli. These cortical maps can undergo plastic rearrangements after changes in afferent ("bottom-up") sensory inputs such as peripheral lesions or passive sensory experience. However, much less is known about the influence of "top-down" factors on cortical plasticity. Here, we studied the effect of a visceral malaise on taste representations in the gustatory cortex (GC). Using in vivo optical imaging, we showed that inducing conditioned taste aversion (CTA) to a sweet and pleasant stimulus induced plastic rearrangement of its cortical representation, becoming more similar to a bitter and unpleasant taste representation. Using a behavior task, we showed that changes in hedonic perception are directly related to the maps plasticity in the GC. Indeed imaging the animals after CTA extinction indicated that sweet and bitter representations were dissimilar. In conclusion, we showed that an internal state of malaise induces plastic reshaping in the GC associated to behavioral shift of the stimulus hedonic value. We propose that the GC not only encodes taste modality, intensity, and memory but extends its integrative properties to process also the stimulus hedonic value.

  • Animals
  • Conditioning (Psychology)/drug effects
  • Extinction, Psychological/drug effects
  • *Homeostasis/drug effects
  • Models, Neurological
  • Rats
  • Rats, Wistar
  • Saccharin/administration & dosage/pharmacology
  • Somatosensory Cortex/cytology/drug effects/*physiology
  • Taste/drug effects/*physiology
Citation (ISO format)
ACCOLLA, Riccardo, CARLETON, Alan. Internal body state influences topographical plasticity of sensory representations in the rat gustatory cortex. In: Proceedings of the National Academy of Sciences of the United States of America, 2008, vol. 105, n° 10, p. 4010–4015. doi: 10.1073/pnas.0708927105
Updates (1)
ISSN of the journal0027-8424

Technical informations

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