Global brain dynamics embed the motor command sequence of Caenorhabditis elegans

Area of Science:

• Neuroscience
• Computational Neuroscience
• Systems Neuroscience

Background:

• Understanding how individual neuronal activities integrate into complex behaviors is a key challenge in neuroscience.
• Previous research has linked isolated motor actions to neuronal network activity but lacked a framework for sequential behavior assembly.

Purpose of the Study:

• To investigate the neural mechanisms underlying the organization of motor commands into sequential behaviors.
• To explore how global brain dynamics contribute to action selection and behavioral sequencing.

Main Methods:

• Utilized brain-wide calcium imaging in the nematode Caenorhabditis elegans.
• Analyzed coordinated, dynamical network activity across a large proportion of neurons.
• Mapped network activity dynamics to specific motor commands on a single-trial basis.

Main Results:

• Identified cyclical brain-wide network dynamics where distinct neuronal sub-populations are recruited sequentially.
• Demonstrated that these dynamic cycles directly map to the animal's run-and-turn action sequences.
• Showed that these dynamics facilitate action selection and decision-making between alternative behaviors.

Conclusions:

• Global brain dynamics, characterized by coordinated neuronal activity patterns, provide a scaffold for organizing complex behaviors.
• The cyclical recruitment of neuronal sub-populations is fundamental to assembling motor commands into action sequences.
• This study reveals a mechanism for high-level behavioral organization through global brain dynamics.