This is an excerpt from a series presenting a variety of fascinating psychoacoustic phenomena and illusions.
The McGurk effect is an incredible perceptual trick that fools your interpretation of speech.
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Series playlist:    • 42 Audio Illusions & Phenomena -- Psy...  

This video was made in Reaper and Blender, with final editing/compositing done in Davinci Resolve. Some custom software was written to generate various tones and such, and this was done in JSFX in Reaper.