Implantable Brain Electrode Housing

of 18 electrodes into two separate bundles, which can be targeted to different brain regions. The complete assembly is built around the Neuralynx® Halo-18 Microdrive and Freelynx® wireless headstage (Neuralynx®, Bozeman, MT, USA). The included figure shows: (1) an internal cross-section view of the tetrode shuttles, drive body, bundle housing, and bundle collars that hold the front and rear bundles; (2) the exterior of the drive, including the drive cap and weight attachment, which can be loaded with a variable number of washers to acclimate the rat to the weight of the Freelynx® headstage and battery; (3) an enlarged view of the exit tip that includes adjustment screws to move the rear and front bundles of tetrodes along the anterior-posterior axis and dorsal-ventral axis, respectively; (4) the complete recording system, including the Neuralynx® Freelynx® wireless headstage and custom-designed headstage cover, which includes LEDs and a diffuser lens used for video tracking. Note that, with the exception of the drive body, Freelynx® headstage, and battery, all the components shown were developed or substantially redesigned by me.