Information professionals focus on artifacts. This focus shows the value information science has placed on materiality or physicality in its efforts to preserve and make artifacts in specific media accessible. But this focus has proven less useful when dealing with information that becomes available orally. As a strategy to increase understanding of oral information, Turner asserted that it can emerge as a type of artifact, an oral document: an utterance that conveys evidence, by what is said and by how it is uttered, and that incorporates properties of a document. This paper describes one of those properties, materiality, how it applies to non-written information in various literatures, and how the concept applies to oral documents. The authors then propose an exploratory, interdisciplinary research project to discern evidence of the materiality of oral documents in the brain via neuroimaging techniques.