Auditory verbal agnosia
（重定向自Pure Word Deafness）
Auditory verbal agnosia (AVA), also known as pure word deafness, is the inability to comprehend speech. Individuals with this disorder lose the ability to understand language, repeat words, and write from dictation. However, spontaneous speaking, reading, and writing are preserved. Individuals who exhibit pure word deafness are also still able to recognize non-verbal sounds. Sometimes, this agnosia is preceded by cortical deafness; however, this is not always the case. Researchers have documented that in most patients exhibiting auditory verbal agnosia, the discrimination of consonants is more difficult than that of vowels, but as with most neurological disorders, there is variation among patients.