90% of all sensory input is in the form of

• A. Sound
• B. Movement
• C. Vision
• D. Temperature

Answer: (B)

The main idea here is that the nervous system relies most on feedback from the body’s own movements to guide action. Proprioceptive and kinesthetic information—coming from sensors in muscles, tendons, joints, skin, and the vestibular system—provides real-time data about position, orientation, and movement through space. This self-generated sensory stream is constantly informing the brain about how the body is moving, how it’s interacting with the environment, and what adjustments are needed to maintain balance, posture, and coordinated activity. Because motor control and learning hinge on this ongoing feedback, movement-related input often constitutes the dominant form of sensory information the system uses to act and adapt.

Sound, temperature, and vision all contribute important context and environmental detail, but they do not provide the same immediate, self-generated stream of data about the body's own state that movement does, especially in tasks requiring coordination and posture.