With this there goes another fact which characterizes this form of aphasia, and which is called Cortical, as opposed to the subcortical Motor Aphasia described above, that the person may not be able even to think of the words which are appropriate to express his meaning.
"The Story of the Mind"
James Mark Baldwin
All neurologists, M. Marie included, admit this, and the whole question therefore is: Is a destruction of certain limited regions of the superficial grey matter the cause of different forms of speech defects, or are they not due more to the destruction of subcortical systems of fibres, which lie beneath this cortical speech zone?
"The Brain and the Voice in Speech and Song"
F. W. Mott