Techniques for static and dynamic input multiplexing for high-density neural signal recording are disclosed herein. A multiplexer can receive a first set of neural signals via inputs. A subset of the first set of neural signals above a threshold can be determined. A group of the inputs corresponding to the subset of the first set of neural signals can be determined. Operation of the multiplexer can be modified to block inputs not in the identified group of the inputs. A second set of neural signals can be received into the multiplexer via the group of the inputs. The second set of neural signals can be transmitted to a plurality of channels of an amplifier while blocking inputs not in the identified group of the inputs. The second set of neural signals can be amplified using the amplifier. The amplified second set of neural signals can be transmitted for further processing.