New waves: Rhythmic electrical field stimulation systematically alters spontaneous slow dynamics across mouse...

Area of Science:

• Neuroscience
• Computational Neuroscience
• Systems Neuroscience

Background:

• Slow oscillations (SO) are prominent brain rhythms during sleep, characterized by alternating activity and silence.
• Previous studies suggest electrical stimulation can entrain cortical networks and improve memory, but neural dynamics remain unclear.
• Methodological challenges in traditional electrical recordings limit understanding of neural activity during SO manipulation.

Purpose of the Study:

• To investigate the cortical propagation patterns of slow oscillations (SO).
• To examine how sinusoidal electrical field stimulation modulates SO activity and propagation.
• To understand the neural mechanisms underlying SO entrainment and potential memory manipulation.

Main Methods:

• Utilized voltage-sensitive dye (VSD) imaging in urethane-anesthetized mice.
• Recorded neural activity in a bilateral cortical preparation.
• Applied sinusoidal electrical field stimulation to frontal cortical regions.

Main Results:

• Under spontaneous conditions, SOs propagated along an anterior-posterior axis with diverse trajectories.
• Electrical stimulation induced novel SO propagation patterns, with varied initiation zones and a consistent posterior termination zone.
• Stimulus-induced SO activity exhibited higher stereotypy (reproducibility) compared to spontaneous activity.

Conclusions:

• Slow electrical field stimulation effectively entrains and modifies cortical slow-wave activity during sleep-like states.
• Altered SO dynamics suggest a mechanism for targeting specific cortical representations.
• This approach holds potential for manipulating memory processes by modulating neural dynamics.