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Poizner, H., Klima, E., & Bellugi, U. (1987). What the hands reveal about the brain. Cambridge, Massachusetts: MIT Press.
This book provided ground-breaking research demonstrating that languages are processed in the left hemisphere of the brain, regardless of language modality. The researchers also describe parallels between the different forms of aphasic impairment in sign and spoken language users. They provide examples in spoken and sign languages of the two main kinds of aphasias, one located in the anterior areas of the left hemisphere and referred to as non-fluent aphasia, and the other found in the posterior regions, referred to as fluent aphasia.