VESTIBULAR SENSORY SYSTEM
What is our Vestibular System and how do we get Vestibular Information?
Our vestibular system has receptors (or nerves that take information to our brain) in our inner ear, which is why it gives us information about how our head is moving. Each type of movement activates a different type of vestibular receptor. Types of movement include bouncing up and down (vertically), moving in circles (rotation), moving left to right (horizontally). Because it also tells us how gravity is acting on us (why there is no vestibular input present in space), it also helps us with balance and establishes our postural control (deep core muscles).
It is important to note that our auditory and vestibular systems are both in our inner ear and travel up the same nerve to our brain. This type of input is processed mainly unconsciously, as on Earth with gravity, we are getting constant information to ground us as a “reference point”.
What does Vestibular Information do functionally for us?
The vestibular system tells us where we are in space and how we are moving. It’s function is similar to that of a gyroscope in an airplane. If the gyroscope is giving us good information we know where and how we are moving and where we are in space. If the gyroscope breaks, even if you are able to see the ground, you would end up flying in circles or spirals. Visual information is useless unless we can relate it to a physical reference point.
How will you know if this is a favorite type of input for your child?
A child that enjoys vestibular input is constantly on the go. They will seek input of this type by running around the house, spinning in circles, or constantly asking to be flipped or turned upside down.
How will you know if this is not a favorite type of input for your child?
A child that does not enjoy vestibular input may avoid bringing their head out of an upright position. They may be sedentary in their play, and may be late crawling (should be initiated by 9-10 months of age – red flag when not attempted by 11 months), cruising (should be initiated by 10 months – red flag if not initiated by 12 months), or walking (should be initiated by 12-14 months – red flag if not initiated by 18 months). Moving or being moved may be distressing for this child. They will be uncomfortable in a swing or on a slide. They may be afraid of heights or not like their feet off the ground.