SYNCHRONOUSLY • DICCIONARIO INGLES.COM • Definition of Synchronously

... This is as we should expect, for they form a part of the whole cerebral mechanism which presides over the voice in speech and song. But because the muscles of the tongue, the lower face muscles, and even the muscles of the jaw do not necessarily and always work synchronously and similarly on the two sides, there is more independence in their representation in the cerebral cortex. Consequently a destruction of this region of the brain or the fibres which proceed from it to the lower executive bulbar ...

— The Brain and the Voice in Speech and Song • F. W. Mott