"Correlations among trunk impairment, functional performance, and functional activity during functional reaching task in patients with chronic stroke" by Kim, J. et. al.
Results: “Trunk impairment was found to be correlated with balance, and gait; therefore, any intervention that improves trunk performance will facilitate improvement in balance and gait in stroke patients”
TIS showed lesser weight shift over sound limb = trunk stability impacts one's balance needed for gait