Transcortical Sensory Aphasia, or TSA, is a type of Aphasia where sufferers have poor comprehension, but have fluent, grammatical speech. Patients can communicate well and are capable of good repetition. The main problem lies within the brain in a region known as the Temporal-occipital-parietal junction, located behind Wernicke's area. This disruption causes TSA sufferers to have Semantic paraphasia wherein aphasics do not use the correct word, but use another word of similar content (ie. Apple is mistaken for Orange, Paper is mistaken for Pencil, etc.)