The implantation of electrodes in the brains of animals is accomplished through the use of which of the following?

A) a stereotypical instrument
B) a tachistoscope
C) the electroencephalograph
D) a stereotaxic instrument

The implantation of electrodes in the brains of animals is accomplished through the use of a stereotaxic instrument, which allows for precise targeting of brain regions. Option A is close but not specific enough, as stereotaxic instruments are a type of instrument used for this purpose. Option B is incorrect, as a tachistoscope is used to present visual stimuli for very brief durations. Option C is also not specific enough, as an electroencephalograph is an instrument used to measure brain waves, not to implant electrodes.