Mind states corresponding to sleep, anesthesia, wakefulness, or coma are characterised by particular patterns of cortical exercise dynamics, from native circuits to full-brain emergent properties. We beforehand demonstrated that full-spectrum indicators, together with the infraslow part (DC, direct current-coupled), could be recorded acutely in a number of websites utilizing versatile arrays of graphene solution-gated field-effect transistors (gSGFETs). Right here, we carried out continual implantation of 16-channel gSGFET arrays over the rat cerebral cortex and recorded full-band neuronal exercise with two targets: (1) to check the long-term stability of implanted units; and (2) to analyze full-band exercise through the transition throughout totally different ranges of anesthesia. First, we exhibit it’s attainable to report full-band indicators with stability, constancy, and spatiotemporal decision for as much as 5.5 months utilizing continual epicortical gSGFET implants. Second, mind states generated by progressive variation of ranges of anesthesia could possibly be recognized as historically utilizing the high-pass filtered (AC, alternating current-coupled) spectrogram: from synchronous gradual oscillations in deep anesthesia via to asynchronous exercise within the awake state. Nonetheless, the DC sign launched a extremely vital enchancment for brain-state discrimination: the DC band offered an nearly linear data prediction of the depth of anesthesia, with about 85% precision, utilizing a skilled algorithm. This prediction rose to about 95% precision when the full-band (AC + DC) spectrogram was taken into consideration. We conclude that recording infraslow exercise utilizing gSGFET interfaces is superior for the identification of mind states, and additional helps the preclinical and scientific use of graphene neural interfaces for long-term recordings of cortical exercise.