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If you read the post Believing then you know AM radio can sometimes be heard without needing an actual radio. The usual tuner, amplifier, or speakers aren't present but music or speech can still be heard.
That sort of thing unapologetically defies our understanding of the world (cause and effect, physics, even common sense). But at least when it happens the audio can be easily recorded for proof.
There's no need to take someone's word on the matter or wonder about their mental health.
But consider the possibility of someone clearly "hearing" something but only having limited success capturing it as a recording. That type of situation occurs much more frequently than the former and no tape recorder, microphone, or parabolic antenna can button click an answer on it's own. If you know anyone diagnosed with schizophrenia then you might be familiar with the frustration that can result.
For the handful of times something out of the ordinary was heard and a recording captured... it doesn't sound anything like what was heard or "heard". Instead we have something closer to gibberish that might turn into an actual voice if you "cross your ears" while listening.
- The recordings capture what sounds like the rise and fall (change of pitch) from a male or female voice.
- There are no discernable words being spoken - just an impression of vowels and syllables that don't materialize and the changes in pitch.
- The stream of vowel and syllable impressions is continuous. Whatever's generating them doesn't need to ever stop for a breath.
- When the same recording is played in mono sound the "voice-like" things vanish - they're only noticeable when played in stereo. When hearing it in mono there's only staticky noise.
- I don't think this behavior is normal (but I don't know for sure).
- It might be backwards.
- The most difficult to explain detail is how no one that's listened to the recordings so far can hear the "voice-like" characteristics.
- For some strange reason - and for lack of a better description - the recordings need to be listened to like a 3D effect poster needs to be stared at before the image emerges. If the analogy is accurate then one possibility for it being hard to hear might be that everyone I know had trouble with seeing the 3D image the first time they tried. They would go crossed eyed first from trying. I just don't think telling someone to go cross eared will be considered helpful.
- Wikipedia, "Autostereogram"
- Michael A Akeroyd, "A binaural beat constructed from a noise" J Acoust Soc Am. 2010 Dec; 128(6): 3301–3304
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