Final answer:
Left frontal lesions can cause symptoms such as aphemia and loss of lateral peripheral vision, known as bilateral hemianopia.
Step-by-step explanation:
Left frontal lesions cause patients to appear with various symptoms depending on their specific condition. One common symptom is the loss of language production, known as aphemia. This occurs when damage occurs to Broca's area in the left frontal lobe, which hinders the ability to speak and form meaningful language. Another potential symptom is the loss of lateral peripheral vision, called bilateral hemianopia, which happens when a growth in the pituitary gland presses against the optic chiasm and interferes with signal transmission.