Impaired anticipation of force control following lateralised brain damage in size-weight illusion

When lifting two objects with equal weight but different size, we judge the smaller object to be heavier (size-weight illusion). Repeatedly lifting big and small boxes one after the other, we learn to scale our grip force to objects' actual weight but perceptually we still feel the small one to be heavier. This study explores whether lateralised brain lesions of stroke patients will result in different impairments in the anticipation of fingertip grip force control in a size-weight illusion paradigm. Specifically, we are also interested in the effect of apraxia in this task. Four groups of participants have been…