Continued from page 1
The constant ambient air temperature is
physical mechanism which, in random fashion, creates sound waves that resonate within
air column leading to
eardrum. It follows then, that these incoherent sound waves create a "resonant pressure" on
eardrum, similar to what it is like when you hold a seashell to your ear and
sound waves bounce around. The resonant pressure fluctuates and increases
random firing of nerve cells in
auditory system. Transmitted from
auditory system to
brain, these random firings result in noise that masks or obscures a signal that contains speech or other useful information.
The smaller shape of
monkey’s ears means that
monkey is faced with a lot more "seashell-type roar" and noise than humans take in. "So that’s what
average monkey is faced with—a lot more white noise is created in
little ear that blocks
outer ranges of sound. This also explains
historic bank of data that indicates that monkeys hear a smaller range of sounds than humans do.
So, in essence, my little Ziggy’s ears get a lot of ambient noise and those dumb looks in a chaotic setting can be written off to her diminished hearing, or, let’s say her not hearing at a comfortable level. ###
Andrea Campbell is
author of Bringing Up Ziggy: What Raising A Helping Hands Monkey Taught Me About Love, Commitment, and Sacrifice. She frequently writes about monkeys, forensic science, criminal justice, writing and parties….

Andrea Campbell is the author of eight books on a variety of subjects including forensic science, criminal law, and primatology.