These researchers found that, although performance in all groups was similar, neuroimaging revealed that bilinguals showed greater signal intensity within the posterior temporal regions (Wernicke's area) while using both languages in rapid alternation than when they were only using one language.

Verbal paraphasias are the only type of paraphasias that can also be linked to nonfluent aphasias, and they are mainly caused by lesions to the posterior temporal region of the brain, the head of the caudate nucleus, or both.

A brain MRI revealed thickened cerebral cortices with few and large gyri prominently in the frontal and posterior temporal regions, incomplete development of the Sylvian fissures, and dilatation of the posterior horns of the lateral ventricles (colpocephaly).

Penfield and Roberts (1959) give the following data for those of their patients who received electrical stimulation in Broca's area and/or in inferior parietal and/or posterior temporal regions of the left hemisphere during surgery carried out for the relief of focal epilepsy.