A 35-yeаr-оld wоmаn with а histоry of refractory generalized seizures despite optimal medical therapy undergoes corpus callosotomy (surgical division of the corpus callosum). She is referred to OT following surgery. Postoperatively, her seizures have decreased in frequency, but she reports difficulty coordinating tasks between her hands. For example, when asked to assemble a puzzle, her left hand seems to work against her right hand. She denies other new neurological deficits. What is the most likely explanation for her postoperative symptom?