Final answer:
The orthographic processing of the visual word 'Letterbox' occurs in the temporal portion of the brain.
Step-by-step explanation:
The orthographic processing of the visual word 'Letterbox' occurs in the temporal portion of the brain. This is supported by the fact that visual processing continues in two streams from the primary visual cortex in the occipital lobe – one into the temporal lobe and one into the parietal lobe. The temporal lobe is primarily involved in processing and interpreting sounds, and it plays a key role in the identification and recognition of visual stimuli and their significance.