Cortical Network Synchrony Under Applied Electrical Field in vitro.

Area of Science:

• Neuroscience
• Biophysics
• Computational Biology

Background:

• Synchronous network activity is vital for complex brain functions.
• Applied electric fields (EFs) are used to study neural network responses.

Purpose of the Study:

• To investigate the effects of applied EFs on random cortical networks in vitro.
• To explore how EF parameters influence network synchrony and neuronal activity.

Main Methods:

• Utilized gold wire-embedded silk protein film interface cultures.
• Exposed 2-week-old cortical cultures to EFs (27 mV/mm) and monitored activity via time-lapse calcium imaging.
• Analyzed calcium signal time series using community detection algorithms.

Main Results:

• Alternating EFs with changing frequencies induced large-scale, synchronized oscillations in cortical networks.
• Both field polarity and frequency changes were necessary for network synchrony; constant frequency or monophasic pulses were ineffective.
• Increasing EF frequency entrained group-specific oscillatory patterns, while decreasing frequency revealed complex amplitude and phase patterns.

Conclusions:

• Proposed a network control mechanism involving coordinated stimulation (alternating polarity) and time delay (frequency change).
• Demonstrated novel EF effects on random neural networks with implications for brain function studies and neuromodulation.