fMRI Study Identifies Brain Regions in Dogs Processing Human Facial Expressions

Brain Regions Respond to Human Emotions

Scientists conducted fMRI scans on dogs and identified a specific brain region that processes happy human facial expressions, such as a smile. The study, published in the journal iScience, also found that dogs can distinguish between negative facial expressions, including anger, sadness, and fear.

Neural Correlates of Emotional Understanding

This research aimed to uncover the neural underpinnings of how dogs process human facial expressions. Co-author Raúl Hernández-Pérez of the University of Vienna noted that studying dog brains can reveal adaptations supporting their social and emotional understanding of humans.

Previous Behavioral and fMRI Findings

Prior behavioral studies have demonstrated dogs' sensitivity to emotion in human faces. Earlier fMRI studies indicated that an area in the canine left temporal cortex showed a stronger response to human faces compared to dog faces, and increased activity in the caudate, hippocampus, and amygdala for emotional human faces versus neutral ones.

Study Methodology

For the experiment, eight socialized dogs (six Border Collies, one Labrador, and one Golden Retriever) participated. Seven dogs had prior fMRI experience and were trained to remain still during scans. Dogs were shown a series of stranger's faces with either neutral or happy expressions for seven seconds while in the MRI machine. No restraints were used, and dogs were provided with chin rests and ear protection.

Key Findings on Happy Expressions

Analysis of the fMRI data revealed that the temporal cortex, associated with higher cognitive functions, and the caudate nucleus, linked to reward, exhibited the most activity in response to happy human faces. The use of stranger's faces aimed to eliminate any familiarity effects on the results.