Differences in the emergent coding properties of cortical and striatal ensembles

Area of Science:

• Neuroscience
• Computational Neuroscience
• Systems Neuroscience

Background:

• Understanding brain region function requires examining neuronal coding at both individual and ensemble levels.
• The anterior cingulate cortex (ACC) and dorsal striatum (DS) are crucial for motor control and decision-making.

Purpose of the Study:

• To investigate how neural information is combined at the ensemble level in the ACC and DS.
• To compare sequence and location decoding in these two brain regions during a motor task.

Main Methods:

• Simultaneous multi-neuron recordings from the ACC and DS in rats performing action sequences.
• Analysis of neural ensemble activity to decode action sequences and lever locations.
• Comparison of synchronous vs. asynchronous information processing between brain regions.

Main Results:

• Per-neuron decoding of sequence and lever location was similar in the ACC and DS.
• DS showed transient, synchronous representations of sequence and location.
• ACC displayed independent, asynchronous representations of sequence and location.
• The ACC achieved higher overall ensemble decoding accuracy.

Conclusions:

• The way neural information is combined across neurons (ensemble coding) dictates functional differences between brain regions.
• Asynchronous ensemble coding in the ACC supports more robust and accurate information processing for complex tasks.