Final answer:
The temporal lobe is stimulated first upon hearing a spoken word because it processes auditory information and is involved in language comprehension.
Step-by-step explanation:
The temporal lobe is most likely to be stimulated first upon hearing a spoken word. This is because the temporal lobe is the region of the brain that is primarily involved in processing auditory information. Within the temporal lobe, the auditory cortex is responsible for processing sounds and is closely associated with the comprehension of language. Wernicke's area, also located in the temporal lobe, is important for speech comprehension. Other lobes of the brain, like the occipital lobe and the parietal lobe, have different functions, such as vision and somatosensory processing, respectively.