MRI study shows dogs' brains react to human smiles

Researchers have conducted an MRI study on 12 dogs to observe how their brains respond to various human facial expressions. The study aimed to find biological evidence for the emotional connection between humans and dogs.

Results indicated that seeing a smiling human face immediately activates the dog's reward circuit, specifically within the right temporal cortex and the caudate nucleus. This is the same neurological response observed when a dog receives food or praise. Conversely, negative emotions such as fear or anger trigger distinct, different patterns in the canine brain, suggesting that dogs can subtly decode human moods. Scientists attribute this visual empathy to the 15,000-year history of domestication and coexistence between the two species.