Final answer:
Angie's surgery likely involved severing of the corpus callosum, resulting in a split-brain condition.
Step-by-step explanation:
Based on the information provided, it is likely that Angie's surgery involved severing of the corpus callosum. The corpus callosum is a large bundle of fibers that connects the left and right hemispheres of the brain. When the corpus callosum is cut, the two hemispheres are unable to communicate with each other effectively. This can result in a condition called split-brain, where each hemisphere functions somewhat independently.