Characterization of Ultrasonic Vocalization-Modulated Neurons in Rat Motor Cortex Based on Their Activity Modulation...

Area of Science:

• Neuroscience
• Animal Behavior
• Auditory Communication

Background:

• Vocalization is crucial for social communication across species.
• Rats and mice utilize ultrasonic vocalizations (USVs) in social and emotional contexts.
• The motor cortex's role in USV control via connections to the periaqueductal gray matter (PAG) is not fully understood.

Purpose of the Study:

• To investigate neural activity in the rat motor cortex during USVs.
• To map motor cortex projections to the PAG.
• To understand the neuronal basis of USV generation.

Main Methods:

• Large-scale electrophysiological recordings in rat motor cortex during USVs.
• Retrograde labeling to trace motor cortex projections to the PAG.
• Optogenetic tagging to identify and record from PAG-projecting neurons.

Main Results:

• Neural activity patterns during USVs differed between anterior and posterior motor cortex regions.
• Two distinct clusters of PAG-projecting neurons were identified in the motor cortex.
• Posterior PAG-projecting neurons showed sustained excitatory responses during USVs.

Conclusions:

• The study elucidates the involvement of specific motor cortex circuits in USV production.
• Findings highlight differential roles of anterior and posterior motor cortex regions in vocalization.
• This research advances understanding of the neural mechanisms underlying vocal communication.