Final answer:
Gerald's difficulty in naming objects while maintaining better reading skills and articulation suggests he has anomic aphasia, likely resulting from a lesion in the language network of his left hemisphere, related to his cerebral artery infarction.
Step-by-step explanation:
The condition being described in the case of Gerald, the 60-year old man, is known as anomic aphasia (also called nominal aphasia or amnestic aphasia), which is characterized by difficulties in naming objects. Anomic aphasia is often associated with lesions in the temporal lobe, but can arise from lesions in any area of the language network. Despite difficulties in object naming, patients like Gerald may retain relatively intact grammar, articulate speech, and comprehension. Gerald's preserved ability to read words and sentences aloud suggests that the visual word form area, which is involved in the visual recognition of written words, is likely intact.
Given the history of a cerebral artery infarction (stroke) and resulting right-sided hemiparesis, it is possible that Gerald's stroke affected language areas in the left hemisphere of the brain, which is dominant for language in right-handed individuals. The absence of paraphasia and only mild writing impairment further characterize the specific nature of his language deficit.