Neuronal coding of auditory sensorimotor gating in medial prefrontal cortex

Area of Science:

• Neuroscience
• Behavioral Neuroscience

Background:

• The medial prefrontal cortex (mPFC) is implicated in sensorimotor gating.
• Prepulse inhibition (PPI) of the startle response is a key measure of sensorimotor gating.
• Neuronal mechanisms underlying mPFC's role in gating are not fully understood.

Purpose of the Study:

• To investigate the neuronal mechanisms of sensorimotor gating in the mPFC.
• To examine how neuronal activity in the mPFC changes during PPI in freely moving rats.

Main Methods:

• Simultaneous recording of head acceleration and mPFC neuronal activity in rats.
• Utilized a novel headstage with a 3D-accelerometer to measure startle reflex.
• Recorded single unit activities in the mPFC during acoustic startle and PPI.

Main Results:

• Head acceleration duration and amplitude were significantly reduced during PPI compared to pulse-alone trials.
• A high proportion of mPFC neurons exhibited characteristic firing patterns in response to startle and PPI stimuli.
• Demonstrated startle and PPI-elicited neuronal activity changes in the mPFC.

Conclusions:

• The study provides the first evidence of startle and PPI-elicited neuronal activity changes in the mPFC.
• These findings support a crucial role for the mPFC in sensorimotor gating processes.