They seem to be forgetting one item. Air conduction is much more sensitive than bone conduction. Only if the conductive mechanism of the middle ear is damaged does bone conduction have any significance. The volume and shape of the ear canal is likely to have more of an effect on normal hearing than any change in the shape or size of the skull. It would be interesting to run a similar study on a group of people with advancing otosclerosis a disease where the bones of the middle ear become frozen and can not transfer vibration from the tympanic membrane to the inner ear. Variations in hearing between people with normal hearing is to the greatest extent due to the interpretation of that thing between the ears.
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