Ikoma, Japan—Dogs, having lived alongside humans for tens of thousands of years, are keenly tuned in to our emotions. Behavioral experiments, brain studies, and even measurements of heart rate all suggest dogs respond differently depending on the emotional expressions they encounter in humans.
However, in everyday interactions, dogs may encounter conflicting emotional cues, such as a happy face paired with an angry or stern voice. How the dog brain handles such conflicting cues remains largely unknown, as existing brain studies have relied on imaging techniques that are too slow to track rapid changes in brain activity.
To address this gap, a research team led by Associate Professor Takatomi Kubo from the Graduate School of Science and Technology at Nara Institute of Science and Technology (NAIST), Japan, used electroencephalography (EEG) to investigate how dogs respond to mismatched emotional cues from their owners. Their paper, published in Scientific Reports on August 22, 2026, was co-authored by Ms. Hitomi Koike, Ms. Maaya Saito, Dr. Takefumi Kikusui, and Dr. Miho Nagasawa from Azabu University, Japan; Ms. Natsuna Ishida from NAIST; Dr. Toshitaka Yamakawa from NAIST and Quadlytics Inc.; Dr. Yuki Maruno from Kansai University, Japan; and Dr. Takumi Ozono and Prof. Kazunori Ohno from Tohoku University, Japan.
The researchers recorded EEG signals from three pet dogs trained to remain still while wearing a special EEG cap. Each dog watched audiovisual clips combining photographs of its owner displaying either happiness or anger with recordings of the owner's voice, also expressing one of these emotions. Afterward, the researchers compared event-related potentials (ERPs) when the facial and vocal emotions matched versus when they conflicted. Simply put, ERPs are marked, localized changes in electrical activity that can be tied to a specific event, such as a visual or auditory signal.
The results showed that mismatched emotional cues elicited larger late ERPs than matching cues, particularly between 250 and 500 ms after the voice clip was played. This difference was most consistent at one of the frontal electrodes, although the precise locations of significant ERP responses varied between individual dogs. "These preliminary findings suggest that dogs may show neural sensitivity to incongruent audiovisual emotional cues from their owners, potentially reflecting increased attentional, integrative, or expectancy-violation processes," explains Dr. Kubo.
Since only three pet dogs were involved in the study, the researchers note that these findings alone cannot establish whether dogs specifically integrate emotional information across senses or if the observed responses were a more generic reaction to expectations being disrupted. Still, this work establishes a useful EEG-based framework for future research on audiovisual emotional processing in dogs. "Our study provides a way to investigate how dogs process conflicting cues using non-invasive brain recordings. With further validation, our approach could help researchers understand how human communication affects dogs in everyday care and training," remarks Dr. Kubo.
Future studies involving more dogs and behavioral measurements will eventually improve our understanding of human–dog communication and shed light on how animals perceive emotional signals from another species.
