Patients who lose their balance on conditions 3, 4, 5 & 6 are said to have a sensory selection problem. This is defined as an inability to effectively adapt sensory information for postural control. [1]
Of the 5 traditional senses, the senses involved (i.e. that are being tested) in the CTSIB are vision and touch (sensation from the feet and stimulation of the various somatosensory organs e.g. in the joints). The conditions that challenge these senses so that they require adaptation for postural control are 3 – 6 (in some conditions, the senses are challenged singly such as vision in condition 3. In others, such as conditions 3 & 6, both senses are challenged simultaneously. In conditions 4 – 6, the sensations from the feet – touch, are challenged by the presence of the foam underfoot. In addition, the somatosensory system is challenged as well).
Conditions 1 & 2 don’t count because the senses here are not being ‘challenged’ (opening and closing the eyes don’t qualify as a sensory challenge so also does standing on firm ground).
Reference 1: Motor Control: Translating Research into Clinical Practice. Anne Shumway-Cook, Marjorie H. 3rd Edition. Lippincott Williams and Wilkins. 2007. Chapter 11, Pg 274., Reference 2, Reference 3
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