An augmented reality (" AR ") device may be configured to monitor peripheral audio data. The AR device can detect speech in the surrounding audio data, convert the detected speech into text, or detect keywords such as rare words in speech. When a rare word is detected, the AR device can retrieve auxiliary information (e.g., definitions) associated with a rare word from a public or private source. The AR device may display assistance information to the user to help the user better understand the speech. The AR device can perform translation of foreign language speech, display the text (or translation) of the speaker's speech to the user, or display statistics or other information associated with the speech.
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