Anatomy of the temporal lobe and signs of its lesion

1. Big picture

The temporal lobe is the cortical region for hearing, language comprehension, memory, emotion, olfaction-related limbic functions, and part of the visual pathway. In the exam, the temporal lobe is important because its lesions give very characteristic localization clues:

Temporal lobe lesion = Wernicke aphasia + complex focal seizures + déjà vu/jamais vu + superior quadrantanopia + memory disturbance.

The lecture highlights the following key signs: Wernicke aphasia, temporal epilepsy with déjà vu/jamais vu and dreamy states, contralateral homonymous upper quadrantanopia, memory disturbance from hippocampal involvement, depression/irritability,