Commutation-Translation System#
To minimise the tethering cable’s interference with natural behaviour and prevent tangling during extended periods of recording, the Neuropixels commutation-translation system integrates the ONIX commutator with a servo motor-powered linear actuator, enabling closed-loop adjustment based on the animal’s 2D position and head direction.
Parts list#
Assembly guide#
Chute#
Linear stage#
Steps 4-10
4. Prepare the 3D printed adaptor as shown.#
5. Attach the adaptor to the sliding carriage of the linear actuator (ID 1).#
6. Bolt the commutator to the adaptor (ID 2, ID 3).#
7. Assemble the motor to the 3D printed motor bracket (ID 4).#
8. Slide the coupler onto the motor drive shaft and tighten the grab screw.#
9. Insert the motor bracket and coupler assembly onto the linear rail shaft and tighten the other coupler grab screw onto it.#
10. Bolt a cable chain to the adaptor plate and to the 3D printed stopper (ID 5).#
Mounting#
Steps 11-14
11. Drill a hole in the middle of the aluminium extrusions and equip the linear rail groove with 3 insertion nuts. Bolt the aluminium extrusion to the rail. Note: the chain cable stopper and motor bracket are bolted onto one of the three extrusions (ID 6).#
12. Connect the cable chute to the assembled actuator via the front support by bolting to the extrusion.#
13. Attach the chute side support to the chute itself and bolt it to the middle aluminum extrusion.#
14. Attach the commutation system to the top of the Aeon habitat using three angle brackets. The positon should ensure that the cable falls in the centre of the habitat.#