Which input coordinates with vestibular input to align the head?

• A. Visual input only
• B. Proprioceptive input only
• C. Vestibular and proprioceptive input
• D. Auditory input

Answer: (C)

The brain aligns the head by integrating signals about motion and position from more than one sensory system. The vestibular apparatus detects how the head is moving and its orientation relative to gravity, while neck proprioceptors tell the brain exactly where the head is positioned relative to the trunk. When these two sources are combined, the nervous system can accurately keep the head upright and aligned with the body, even as you move.

Visual input can support orientation, but it isn’t required for basic head alignment, and auditory input doesn’t provide information about head position. By relying on vestibular plus neck proprioceptive information, you get a robust sense of head orientation in space.