As the year continues, many of these posts will be philosophical in nature. Some will be in contradiction to previous postings. These are not intended as truths or assertions, they’re merely thoughts…ideas. Think of this as stream of consciousness over a wide span…
I’ll be honest, I lied to you last week.
…well, sort of. Talking about spectrum and perception was really all a big set up for this week’s thought.
In his book, The Great Animal Orchestra, Bernie Krause discusses the idea of Biophony; that each sound generating organism evolved in such a way that it’s voice fit into it’s surrounding soundscape so as to not compete with other organisms. If a bird doesn’t have to compete with an insect or a deer’s vocalizations, or even wind for that matter, it doesn’t have to struggle to be heard by its peers. As a result of this, natural soundscapes tend to fill the spectrum of sound. They aren’t isolated into bands. As I discussed last week, the wider the spectral content, the fuller and louder a sound seems.
This has made me wonder about how our environment affected us as we evolved within it. Perhaps this activation of more critical bands was a selective element in our evolution. There are cases of animals becoming quiet when predators are present, which would decrease the spectral content of our environment. If a human’s surroundings didn’t sound as “full” as they usually might, wouldn’t that be a clue that something is out of the ordinary? Would that help an early human survive the rigors of life in the wild? Would that also explain why we are so sensitive changes to the spectral content of sound?