What is the current progress on how head direction cells (for orientation) work?

#1

Can displacement cells exist in both grid cells and head direction cells?

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#2

The same way that position grid cells displacement can be driven by visual flow and sensed self motion resulting from propulsive limb movements, head direction cells are very likely to be driven by the vestibular system and the combination of the somatic-sensory kinematic chain extending from the sensed support “up.”

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