Final answer:
Lesions in the left hemisphere can cause issues with communication and linear processing of information, often a result of damage to the corpus callosum, which leads to a split-brain condition.
Step-by-step explanation:
Difficulty in communication and processing information in a linear manner is often due to a lesion in the left hemisphere of the brain. The corpus callosum, which connects the left and right hemispheres, plays a crucial role in enabling these hemispheres to communicate.
Cutting the corpus callosum, as seen in split-brain surgeries to treat intractable epilepsy, can severely impede the interhemispheric transfer of information, leading to difficulties in verbal communication and linear information processing.
In particular, the left hemisphere is predominantly responsible for language functions in approximately 95 percent of the population. It controls the right side of the body through the corticospinal tract and receives sensory information for the opposite side. Thus, damage to the corpus callosum can prevent this interhemispheric coordination, manifesting as difficulties in speech and linear reasoning, a characteristic of split-brain condition.