Statistical Parametric Mapping (SPM 1D) for Stroke and Trans-tibial Amputation

Inclusion Criteria for stroke patients: * First ever chronic unilateral hemiparetic stroke subjects, with stroke diagnosed by a physician and confirmed via CT/MRI * \>6 months post stroke * ambulant with at most contact guard/standby supervision with/without walking aid during the study * 10m Walk Test \>/=0.2m/s and 6min Walking test walking distance of \>/=50m without rest stop, with Functional Ambulation Category of \>/=4 ((Holden et al, 1994) * AMT\>6 * able to understand study procedures and sign informed consent * able to attend a single 2.5h session of research data collection. Inclusion Criteria for amputee patients: * First ever chronic unilateral transtibial amputee subjects * intact residual limb * \> 6 months post amputation * ambulant with at most contact guard/standby supervision with/without walking aid during the study * 10m Walk Test \>/=0.2m/s and 6min Walking test walking distance of \>/=50m without rest stop * with Medicare K level of \>1 * AMT\>6 * able to understand study procedures and sign informed consent * able to attend a single 2.5h session of research data collection. Exclusion Criteria: * Unstable recent cardiorespiratory conditions including uncontrolled hypertension/ hypotension, angina pectoris, myocardial infarction, active congestive cardiac failure, untreated cardiac arrhythmias (e.g. atrial fibrillation), untreated pulmonary embolism or deep vein thrombosis, presence of cardiac pacemaker. * Functional status: severe aphasia or neglect (inability to obey 1 steps command), communication disorder precluding understanding of instructions, cognitive impairment, dementia, untreated depression or psychiatric disorder. * End stage conditions such as medical instability or orthostatic insufficiency, organ, renal, liver, heart failure and life expectancy \<6 months or on haemodialysis. * Pregnancy. * Local limb conditions which could be exacerbated by research interventions such as open wounds, ulcers, stump pain or stump wounds/ulcers, neuromas in amputees, active arthritis or joint or limb pain. * Skin conditions which could be worsened by application of adhesive skin markers such as uncontrolled eczema, psoriasis, fungal or bacterial infections etc.