Modulation of inhibitory communication coordinates looking and reaching.

Area of Science:

• Neuroscience
• Motor Control
• Brain Communication

Background:

• Coordinated looking and reaching are essential for natural behaviors.
• Understanding neural communication between brain regions is key to deciphering flexible motor control.
• While gamma-frequency neural coherence is linked to excitatory communication, inhibitory mechanisms remain less understood.

Purpose of the Study:

• To investigate how neurons in different brain regions communicate to enable flexible, coordinated behaviors.
• To elucidate the mechanisms of transient neuronal suppression between brain regions during behavior.
• To explore inhibitory communication during gaze anchoring, a behavior involving coordinated reaches and inhibited saccades.

Main Methods:

• Studied inhibitory communication during gaze anchoring in a natural behavior task.
• Recorded neuronal activity in the posterior parietal cortex (reach and saccade regions).
• Analyzed neural coherence in beta-frequency (15-25 Hz) and gamma-frequency (40-90 Hz) bands.

Main Results:

• Neurons in the reach region of the posterior parietal cortex transiently inhibit neurons in the saccade region during gaze anchoring.
• This suppression of eye movements improves reach accuracy.
• The inhibitory suppression is strongest when reach neurons fire in relation to beta-frequency activity, not gamma-frequency activity.

Conclusions:

• Identified a novel mechanism of inhibitory communication involving beta-frequency neural coherence.
• Demonstrated that beta-frequency coherence can transiently inhibit multiregional communication.
• Provided single-neuron evidence for flexible coordination of natural behavior through targeted inhibition.