A common gustatory and interoceptive representation in the human mid-insula.

Area of Science:

• Neuroscience
• Sensory Processing
• Homeostasis

Background:

• The insula is a key brain region for taste (gustation) and internal body awareness (interoception).
• Previous studies suggest the dorsal mid-insula processes both gustatory and interoceptive information.
• This overlap hints at a role in integrating sensory data for homeostatic regulation and feeding behavior.

Purpose of the Study:

• To investigate the neural basis of shared representations for gustation and interoception in the human insula.
• To determine if the dorsal mid-insula integrates visceral and gustatory information.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used in healthy volunteers.
• Participants performed tasks involving interoceptive attention to visceral sensations and a gustatory mapping task.
• High-resolution fMRI data were analyzed to identify overlapping brain activation patterns.

Main Results:

• Shared neural representations for gustation and visceral interoception were confirmed in the dorsal mid-insula.
• Group conjunction analysis showed overlapping activation for both tasks in this region.
• Region-of-interest analyses indicated that dorsal mid-insula areas responsive to visceral sensations also responded strongly to taste stimuli.

Conclusions:

• The dorsal mid-insula plays a crucial role in integrating gustatory and interoceptive information.
• This integration likely contributes to homeostatic regulation and influences feeding behavior.
• Findings support a unified neural representation for taste and internal body states within the insula.