Differential Rapid Plasticity in Auditory and Visual Responses in the Primarily Multisensory Orbitofrontal Cortex

Area of Science:

• Neuroscience
• Decision-making
• Sensory processing

Background:

• The orbitofrontal cortex (OFC) is connected to sensory and goal-execution areas.
• OFC is known for reward processing and potentially multisensory decision-making.
• Understanding OFC's encoding of sensory stimuli is crucial for multisensory decision-making mechanisms.

Purpose of the Study:

• Investigate the encoding of auditory, visual, and audiovisual stimuli in mouse OFC single neurons.
• Explore multisensory associations and sensory input organization within the OFC.
• Determine the role of OFC in perception-based multisensory decision-making.

Main Methods:

• Studied anesthetized mouse OFC responses to unisensory and multisensory stimuli.
• Utilized a novel multisensory oddball stimulus set.
• Employed retrograde tracers to identify input sources and their properties.

Main Results:

• Nearly all OFC single neurons were multisensory, integrating stimuli with sublinear to supralinear effects.
• OFC receives both unisensory and multisensory inputs, originating from secondary auditory and visual cortices.
• Long audiovisual pairing induced rapid plasticity in OFC neurons, showing a visual bias and altered auditory/visual responses.

Conclusions:

• OFC exhibits rapid, association-driven plasticity absent in primary sensory cortices.
• A local circuit model is proposed for OFC integrating auditory and visual information for stimulus value computation.
• OFC plays a significant role in dynamic multisensory environments and decision-making.