Stepping stability: effects of sensory perturbation

Table 2 Individual subject diagnoses and perturbation error responses.

Participant	Diagnosis	*Emax	^†Emin	^‡Edif
1	HE – Healthy	.26	.10	62.0
2	HE – Healthy	.31	.15	52.6
3	HE – Healthy	.39	.15	60.5
4	HE – Healthy	.42	.13	68.6
5	HE – Healthy	.46	.17	63.7
6	VH – Unilateral vestibular hypofunction	.46	.11	77.0
7	VH – Unilateral vestibular hypofunction	.56	.23	59.2
8	VH – Bilateral vestibular hypofunction	.61	.34	44.9
9	VH – Unilateral vestibular hypofunction	.61	.16	73.6
10	VH – Unilateral vestibular hypofunction	.91	.23	74.3
11	VH – Unilateral vestibular hypofunction	.94	.27	71.1
12	CB – Idiopathic spinocerebellar degeneration	.52	.26	49.3
13	CB – Cerebellar dysfunction	.64	.22	65.3
14	CB – Idiopathic spinocerebellar degeneration	.94	.39	59.0

*Emax = Maximum fractional error at initiation of perturbation; ^†Emin = Fractional error recovery at 2–3 cycles after perturbation; ^‡Edif = Percent difference in fractional error response from initiation to recovery.

ISSN: 1743-0003