Hi there!
Here are the sensory systems that are available for each mCTSIB condition in a perfect world:
-Condition 1: visual, vestibular, somatosensory all available
-Condition 2: vestibular and somatosensory available
-Condition 3: visual and vestibular available
-Condition 4: vestibular available
In real life, standing on a cushion in conditions 3 and 4 won’t totally eliminate somatosensory cues, so interpret with a grain of salt.
Someone with impaired use of somatosensory cues would have a noticeable decline in performance from condition 1 to 2. They would likely have more postural sway than normal in all conditions. We might see this in someone with peripheral neuropathy or a posterior cord-type SCI presentation.
Someone with impaired use of visual cues would likely not have much change in their balance from conditions 1 to 2 or 3 to 4 (the use of visual cues in conditions 1 and 3 wouldn’t be beneficial). We might see this in someone who is visually impaired or blind.