A recent study has revealed that dogs process speech sounds in a manner similar to humans, showing a particular focus on consonants rather than vowels. Published in the journal Science, the research suggests that canine brains exhibit a "consonant bias," a characteristic previously thought to be unique to human language comprehension.

Human brains are known to prioritise consonant sounds when interpreting speech, as this helps to distinguish individual words more effectively within continuous streams of language. Researchers sought to determine whether dogs, widely recognised as humans' closest animal companions, share this mechanism.

The study involved monitoring the brain activity of 20 dogs alongside 20 human participants as they listened to sequences of nonsense words. These sequences alternated between streams where consonant sounds repeated while vowels varied, and those where vowel sounds repeated with changing consonants. Results showed stronger neural responses in both species when consonants were repeated compared to when vowels were repeated.

Kinga Toth, co-author of the study from Hungary’s Eotvos Lorand University, explained that dogs’ brains, like those of humans, synchronised with the rhythm of consonant-focused speech streams. Attila Andics, also from Eotvos Lorand University and a co-author, noted that this consonant bias emerges early in human development and facilitates the segmentation of continuous speech into recognizable words.

This finding marks the first evidence that consonant bias exists beyond humans, indicating a previously unrecognised similarity in how dogs and humans decode spoken sounds. The research expands understanding of animal cognition and highlights the deep connection between dogs and their human counterparts through shared aspects of language processing.