Which sensory conditions are performed on a solid surface in CTSIB?

• A. 4, 5, 6
• B. 1, 2, 3
• C. 2, 3, 4
• D. 1, 3, 5

Answer: (B)

CTSIB uses different ways to challenge balance by changing what you see and what the feet feel, so it can see how the visual, vestibular, and somatosensory systems contribute to staying upright. When the surface is solid, the information from the feet is reliable, and the conditions test how vision is used or limited while that stable support remains. Specifically, you assess standing with eyes open on a firm surface, standing with eyes closed on a firm surface, and standing on a firm surface with sway-referenced vision. These are the solid-surface conditions because the support is stable in all of them. The foam-surface conditions, which alter somatosensory input from the feet, are not part of the solid-surface set.