Neuronal Activity in the Gustatory Cortex during Economic Choice

Area of Science:

• Neuroscience
• Decision Neuroscience
• Sensory Neuroscience

Background:

• Economic choices require computing and comparing offer values.
• The orbitofrontal cortex (OFC) is involved in value comparison, but the computation site for offer values remains unclear.
• The gustatory cortex (GC), part of the anterior insula, is a potential upstream site for computing offer values for edible goods.

Purpose of the Study:

• To investigate whether the gustatory cortex (GC) computes offer values for economic choices.
• To characterize neuronal representations of offer variables within the GC during decision-making.

Main Methods:

• Electrophysiological recordings from the GC of male rhesus monkeys.
• Monkeys made choices between different juice types.
• Analysis of neuronal population activity encoding flavor, quantity, and subjective value.

Main Results:

• GC neurons, as a population, represented flavor, quantity, and subjective value of the chosen juice.
• These variables were encoded by distinct cell groups with different temporal dynamics.
• Crucially, GC neurons did not systematically represent individual offer values, arguing against their computation in this region.
• GC responses reflected subjective value and appeared consummatory, not purely sensory.

Conclusions:

• The gustatory cortex (GC) does not compute offer values for economic choices.
• Neuronal activity in the GC during decision-making reflects variables that follow value comparison.
• GC responses are consummatory, indicating a role beyond simple sensory processing in economic decisions.