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A cortical implant is a device used to interface directly with the mind of a humanoid.

The Breen employ a type of cortical implant to probe the minds of prisoners, with unpleasant mental and physical side effects. These devices were used to interrogate Worf and Ezri Dax in late 2375.

Borg drones are equipped with cortical implants. In 2375, while traversing the Void, Seven of Nine suggested Borg regeneration to Tuvok as a more efficient alternative to meditation, with the caveat that a simple cortical implant would be required. (VOY: "Night")

The neural patterns of individuals assimilated by the Collective are stored within the cortical implants of drones. In 2375, a vinculum infected by Species 6339's synthetic pathogen tapped into Seven of Nine's cortical implant and caused these patterns to emerge, resulting in a condition similar to multiple personality disorder. (VOY: "Infinite Regress")

In 2376, Seven of Nine experimented with downloading data collected by Voyager directly into her cortical implant through her alcove. However, there was too much information for her brain to process, and she began drawing spurious connections and forming conspiracy theories as a result. (VOY: "The Voyager Conspiracy")

The cortical implant in Borg drones may be the same device as the cortical node.
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