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Valence processing differs across stimulus modalities.

Jelle R Dalenberg1, Liselore Weitkamp2, Remco J Renken2

  • 1Modern Diet and Physiology Research Center (MDPRC), Dep. Psychiatry, Yale University, 1 Church Street, Suite 6A, New Haven, CT, 06510, USA; Neuroimaging Center Groningen, University of Groningen, University Medical Center Groningen, Antonius Deusinglaan 2, 9713 AW, Groningen, the Netherlands.

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Summary
This summary is machine-generated.

Pleasantness processing in the prefrontal cortex (PFC) differs by sensory input. While image and flavor pleasantness correlate, distinct PFC regions are activated for each modality, challenging assumptions of a unified valence circuit.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Sensory Processing

Background:

  • The prefrontal cortex (PFC) is implicated in processing emotional valence.
  • It is commonly assumed that valence processing is consistent across different sensory modalities.

Purpose of the Study:

  • To investigate whether the perceived pleasantness of flavors and images is processed similarly in the PFC.
  • To examine the neural correlates of cross-modal valence processing in the human brain.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed using a delayed-response paradigm.
  • Twenty male participants rated the pleasantness of visual images and gustatory flavors.
  • Correlations between subjective pleasantness ratings and PFC activity were analyzed.

Main Results:

  • Significant correlations were found between pleasantness ratings for images and flavors, and their respective PFC responses.
  • However, the PFC regions activated by flavor pleasantness were spatially distinct (more ventral) from those activated by image pleasantness.
  • This suggests modality-specific neural representations of pleasantness within the PFC.

Conclusions:

  • Contrary to the assumption of a singular valence processing circuit, distinct PFC circuits are recruited based on stimulus modality.
  • The observed ventral-dorsal distinction in PFC activation may relate to proximal (flavor) versus distal (image) stimulus representations.