Neural coding in gustatory cortex reflects consumption decisions: evidence from conditioned taste aversion

Area of Science:

• Neuroscience
• Sensory Systems
• Learning and Memory

Background:

• Neurons in the gustatory cortex (GC) encode stimulus properties like palatability.
• Conditioned taste aversion (CTA) learning may modify cortical taste representations.

Purpose of the Study:

• To investigate how CTA to NaCl affects neural responses in the mouse gustatory cortex.
• To determine if taste learning alters the neural representation of taste stimuli.

Main Methods:

• In vivo calcium imaging using miniscopes to record neuronal activity in the GC of mice.
• Comparison of taste responses before and after CTA conditioning to NaCl in control and conditioned mice.
• Tracking of CTA extinction and corresponding neural pattern changes.

Main Results:

• No significant changes in the number of responsive cells or response magnitude to NaCl or other tastes post-conditioning.
• Population-level analysis revealed NaCl's neural representation diverged from appetitive stimuli and moved towards aversive quinine after CTA.
• Neural patterns reverted to behavioral changes during CTA extinction.

Conclusions:

• The gustatory cortex's primary role in taste representation is palatability.
• Population neural activity reflects the animal's decision to consume or reject a stimulus, irrespective of its chemical identity.