The object of the invention is based on flexible epicortical and intracortical arrays of graphene solution-gated field-effect transistors (gSGFETs), which are able to record infraslow signals alongside with signals in the typical local field potential bandwidth. The object of the invention is based on graphene transistor system for measuring electrophysiological signals, comprising a processing unit, and at least one graphene transistor (gSGFET) comprising graphene as channel material contacted by two terminals, to which is a tunable voltage source at the drain and source terminals of the transistor (gSGFET) referred to the gate voltage, and at least one filter configured to acquire and split the signal from the transistor into at least two frequency bands, low frequency band and high frequency band, wherein the first and second signals are respectively amplified with a gain value.
SYSTEM OF GRAPHENE TRANSISTORS FOR MEASURING ELECTROPHYSIOLOGICAL SIGNALS