A neural implant provides an interface between the nervous system and a device. Some electrodes record signals; others deliver electrical stimulation. Certain systems combine measurement and response. Location and purpose vary: an implant may operate in the brain or near other nerves, and computer control is not always its goal.
Deep brain stimulation is an established treatment for particular medical conditions. An implanted system delivers signals to selected regions. Interfaces that decode attempted speech into synthesized voice, by comparison, remain a clinical research pathway. Recording, stimulation and decoding are distinct functions.
Engineering challenges continue after implantation. Tissue responds to foreign material, recorded signals can change, and power and communication must remain reliable. Demonstrating a particular task does not establish unrestricted thought reading. AI contributes signal decoding, while privacy questions concern the resulting data and control over it. Neural implants bring biology and electronics together at widely differing levels of maturity.