Published in PLoS ONE, Laura V. Cuaya, Raúl Hernández-Pérez, and L. Concha investigated how dogs’ brains process human faces, a central component of dog–human social interaction. Dogs rely heavily on human facial cues to recognize individuals and interpret emotional states, yet the neural mechanisms underlying this ability had remained unclear.
To address this question, the researchers used functional magnetic resonance imaging (fMRI) in seven domestic dogs trained to remain awake, still, and unrestrained inside an MRI scanner. This innovative approach allowed the authors to measure brain activity in fully conscious animals during visual perception.
The experimental design employed a block-design visual stimulation paradigm comparing responses to human faces versus everyday objects. This contrast enabled the identification of brain regions selectively involved in face perception rather than general visual processing.
The results showed that viewing human faces elicited significant activation primarily in the bilateral temporal cortex. In contrast, the reverse comparison—everyday objects versus human faces—did not produce significant activation, indicating a specific neural sensitivity to faces rather than nonspecific visual features.
The temporal cortex forms part of the ventral visual pathway, which in other species is known to support complex visual recognition. The authors note that similar face-sensitive regions have been reported in primates and sheep, suggesting a high degree of evolutionary conservation in neural systems for face processing.
By identifying the temporal cortex as a candidate region for processing human faces, this study provides strong evidence that dogs possess specialized neural mechanisms supporting their unique social bond with humans. The findings position face perception as a key pillar of canine social cognition and deepen understanding of how dog brains have adapted to life alongside people.
Cuaya, L. V., Hernández-Pérez, R., & Concha, L. (2016). Our Faces in the Dog’s Brain: Functional Imaging Reveals Temporal Cortex Activation during Perception of Human Faces. PLoS ONE, published March 2, 2016. https://doi.org/10.1371/journal.pone.0149431
