The recent focus on graphene surface electrodes stems from their remarkable sensitivity, biocompatibility, and flexibility, making them a promising avenue for recording and perturbing neuronal activity. This technology holds potential for gaining better insights into cortical networks due to these characteristics. To comprehend local networks of the motor cortex and monitoring network changes during stimulation, we utilized subdurally positioned graphene electrodes for simultaneous recording and stimulation of the motor cortex in rhesus monkeys. Additionally, we implemented a wireless recording method to capture neuronal activity while the monkeys exhibited natural behavior.In our initial investigations, we successfully mapped the motor cortex using graphene surface electrodes, revealing diverse connectivity strengths among channels across various frequency bands. Based on these connectivity patterns, groups of channels that reflect distinct functional delineations were made, showcasing the promising potential for precise mapping of the cortex in freely moving monkeys. Notably, correlations were observed between vocalization and increased gamma oscillation in channels covering the posterior part of arcuate sulcus. Additionally, the velocity of action correlated with decreased beta band activity in more mediodorsally positioned channels. These findings provide crucial support for the integration of graphene subdural electrodes in the study of cortical networks, emphasizing their potential significance in advancing our understanding of neural processes.Mapping the Motor Cortex: Illustration of frequency band connectivities using phase-locking values (top), grouping based on the connectivities, and the corresponding channel locations on the brain (bottom).