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One of the most captivating psychoacoustic effects is binaural beats. These occur when two slightly different frequencies are played in each ear, creating a perception of a third tone through their interaction. The combination leads to a pulsing sound effect known as beating, which can be experienced only through headphones, as the sounds combine in the listener's brain rather than in the air. As the frequencies shift, the way our brain processes these changes showcases the intricacies of auditory perception.