Research conducted at Eötvös Loránd University in Hungary has found that dogs can understand the meanings of certain words, specifically nouns that refer to items they are familiar with. This study monitored the brain activity of dogs while they were shown various objects like balls, slippers, and leashes. The results suggest that dogs can grasp the essence of these nouns beyond basic commands such as "sit" or "fetch."
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Marianna Boros, a researcher involved in the study, noted the implications of this finding on our understanding of language evolution and what it means to be uniquely human. Survey data from 2022 indicated that dog owners believed their pets responded to between 15 and 215 words, supporting the idea that dogs can learn word meanings.
A notable case from 2011 involved a border collie named Chaser, who learned the names of over 1,000 objects through extensive training. However, research on how dogs process words in their brains has been limited until now.
In the current study, 18 dog owners brought their pets to a lab along with five familiar objects. The owners would verbalize the names of the objects before showing the dog either the correct item or a different one. For example, an owner might say, "Look, here’s the ball," while holding up a Frisbee.
Researchers employed non-invasive electroencephalography (EEG) to monitor brain activity and found distinct patterns when the objects matched or did not match the spoken words. These patterns were particularly pronounced for words that owners believed their dogs recognized best.
The findings, published in Current Biology, present the first neural evidence for word-object knowledge in non-human animals. While Boros emphasized that dogs do not understand words to the same extent as humans, the research opens avenues for further investigation into canine cognition and language understanding.
The study also raises questions about why some dogs do not appear to demonstrate this understanding. Boros proposed that dogs may recognize what a word signifies but may not care to respond. She remarked, "My dog only cares about his ball. If I bring him another toy, he doesn’t care about it at all."
Dr. Holly Root-Gutteridge, a postdoctoral researcher at the University of Lincoln who was not involved in the research, called the findings "fascinating" and speculated that this understanding might be common among mammals, shedding new light on language evolution.