A hippocampal prosthesis for bypassing a damaged portion of a subject's hippocampus and restoring the subject's ability to form long-term memories. The hippocampal prosthesis includes a first set of hippocampal electrodes configured to receive an input signal from at least one of the subject's hippocampus or surrounding cortical region. The hippocampal prosthesis includes a processing device having a memory and one or more processors operatively coupled to the memory and to the first set of hippocampal electrodes. The processing device being configured to generate an output signal based on the input signal received from the first set of hippocampal electrodes. The hippocampal prosthesis includes a second set of hippocampal electrodes operatively coupled to the one or more processors and configured to receive and transmit the output signal to the subject's hippocampus.
