Which sensory conditions are performed on an unstable surface in CTSIB?

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

Answer: (C)

The test evaluates how well a person uses visual, vestibular, and somatosensory information to maintain balance by changing surface and visual input. An unstable surface is represented by a foam pad, which disrupts reliable proprioceptive feedback from the feet. The conditions performed on this foam surface are the ones with eyes open, eyes closed, and sway-referenced vision. Since the surface cannot provide stable somatosensory feedback, balance must rely more on vestibular cues and visual processing. Observing performance across these foam conditions helps identify whether balance difficulties stem from how somatosensory input is integrated or from reliance on or processing of visual/vestibular information.