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" ... Biologically, the roof of the human brain, called the tectum, acts as the central processor of information from our eyes and ears, directing attention to what’s important. Visual and auditory signals are paramount in overt attention processed by the tectum, where the cortex administers sensory signals in covert attention (e.g., when you're listening to someone with your back turned). Clearly, it is much more effective to listen while facing forward. Hence, in the world of video, we capture sound alongside sight and motion cumulatively. ... "