With just the power of one beseeching, big-eyed look, dogs can wrap us around their perfect little paws. As it turns out, this ability is at least partially our own doing.
Recently, a team of researchers figured out the 'eyebrow' muscles that contort canine faces into adorable pleading expressions are not typically present in wolves, suggesting they arose after we humans domesticated"The raised inner eyebrow movement in dogs is driven by a muscle which doesn't consistently exist in their closest living relative, the wolf," said Duquesne University anatomist Anne Burrows"This movement makes a dog's eyes appear larger, giving them a...
The stained samples from the muscle around the mouth below reveal dogs and humans both have more fast-twitch muscle fibers relative to slow twitch fibers , whereas it's the opposite for wolves.As implied, fast-twitch fibers respond quickly – perfect for raising eyebrows or barking – but they also fatigue faster. The slow-twitch muscles hold sustained movements for longer, like those required for a wolf's howl.
"These differences suggest that having faster muscle fibers contributes to a dog's ability to communicate effectively with people," Burrows."Throughout the domestication process, humans may have bred dogs selectively based on facial expressions that were similar to their own, and over time dog muscles could have evolved to become 'faster,' further benefiting communication between dogs and humans."ago, it is clear that quick interspecies communication provided a survival advantage against mutual predators.
With such strong pressure to better communicate with humans, natural selection also honed dogs' abilities to understand us; in some ways, perhaps even better than we can understand each other. For starters, our canine companions
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