Binaural beat audio and pre-operative anxiety: a randomised controlled trial (Padmanabhan et al., 2005)
A rare clinical-setting trial: patients awaiting day-case surgery listened to delta-embedded binaural beat audio, the same audio without the beats, or nothing. The binaural beat group showed a meaningfully larger drop in anxiety scores than either control. One study, one context — but the comparison against identical audio minus the beats is exactly the control this field usually lacks, which earns it a place here.
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