A 58-yeаr-оld mаn with chrоnic strоke (left hemipаresis) can maintain standing independently for 60 seconds with a self-selected wide base of support. When asked to stand with feet together, he demonstrates increased mediolateral sway and requires supervision. When asked to reach forward for an object on a shelf, he does not shift his weight anteriorly and instead flexes only at the shoulder, limiting his reach distance. He does not lose his balance during the reaching task. Which classification of balance dysfunction is MOST consistent with these findings?