This Map includes research on language and communication of individuals who are Deaf or Hard of Hearing. Please see the Auditory Neuropathy Spectrum Disorder, Central Auditory Processing Disorder, or Hearing Loss (Adults, Early Childhood, Newborn, and School-Age) Evidence Maps for research specific to the screening, assessment, or treatment of the central auditory system or peripheral auditory system. See the Hearing Loss Evidence Maps for research specific to hearing device candidacy and fitting.