Read the following passages and answer the question given below

By using tiny probes as neural prostheses, scientists may be able to restore nerve function in quadriplegics and make the blind see or the deaf hear. Thanks to advanced techniques, A single, small, implanted probe can stimulate individual neurons electrically or chemically and then record responses. Preliminary results suggest that the microprobe telemetry systems can be permanently implanted and replace damaged or missing nerves.
The tissue- compatible microprobes represent an advance over the typical aluminium wire electrodes used are studies of the cortex and other brain structures. Researchers accumulate much data using traditional electrodes, but there is A question of how much damage they cause to the system. Microprobes, which are about as thin as A human hair, cause minimal damage and disruption of neurons when inserted into the brain.
In addition to recording nervous- system impulses, the microprobes have minuscule channels that open the way for delivery of drugs, cellular growth factors, neurotransmitters, and other neuro-active compounds to A single neuron or to groups of neurons. Also, patients who lack certain bio-chemicals could receive doses via prostheses. The probes can have up to four channels, each with its own recording / stimulating electrode.