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Cortical induction (CI) is a type of technology used in early holodeck modules to directly stimulate the brain, supplementing the use of holographic images. When it was realized how dangerous it was, its use was discontinued and banned. In particular, this technology has a distinctly addictive element to it.
In the year 2369, McHogue tested CI modules on Deep Space 9 before using them as part of his plan to take control of Bajor. (DS9 novel: Warped)