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I witnessed a blind man use their phone with playback speeds that were incredibly fast and completely inaudible to my ears. To my best guess, it would have been about 4-5x speed. (I base this off estimating by going to youtube in chrome, pressing cmd + option + j to bring up developer console, and entering document.getElementsByTagName("video")[0].playbackRate = 4 to increase the playback speed to 4).

Provided that the content is not anything that requires any deep thought (suppose it's a story or instructions you are already familiar with), can the brain adapt to listening to such audio at very high speeds?

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    I took a speed reading course in college and achieved a reading rate of over 400 words per minute with excellent comprehension. But as you said, that's only for things that don't require deep thought. News articles yes, complex textbooks no. My classmates did also, so I'm not special. It's a skill you have to learn and practice, like playing a musical instrument. ("Use it or lose it.") I would imagine if it's possible visually it's also possible audibly. – Carey Gregory♦ Sep 22 at 4:20

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