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Dogs Understand Both Words and Intonation Of Human Speech
Looks like vocabulary learning is not unique to humans.
London: Believe it or not, dogs have the ability to distinguish words and the intonation of human speech through brain regions similar to those that humans use, according to a new study.
The findings suggest that vocabulary learning "does not appear to be a uniquely human capacity that follows from the emergence of language, but rather a more ancient function that can be exploited to link arbitrary sound sequences to meanings", said Attila Andics of Eotvos Lorand University in Budapest, Hungary.
Humans, the researchers said, are only unique in their ability to invent words.
Words are the basic building blocks of human languages, but they are hardly ever found in non-human vocal communications.
Intonation is another way that information is conveyed through speech, where, for example, praises tend to be conveyed with a higher and more varying pitch.
Humans understand speech through both vocabulary and intonation.
In this study, published in the journal Science, Andics and his colleagues explored whether dogs also depend on both mechanisms.
Dogs were exposed to recordings of their trainers' voices as the trainers spoke to them using multiple combinations of vocabulary and intonation, in both praising and neutral ways.
For example, trainers spoke praise words with a praising intonation, praise words with a neutral intonation, neutral words with a praising intonation, and neutral words with neutral intonation.
Researchers used functional MRI to analyse the dogs' brain activity as the animals listened to each combination.
Their results revealed that, regardless of intonation, dogs process vocabulary, recognizing each word as distinct, and further, that they do so in a way similar to humans, using the left hemisphere of the brain.
Also like humans, the researchers found that dogs process intonation separately from vocabulary, in auditory regions in the right hemisphere of the brain.
Lastly, and also like humans, the team found that the dogs relied on both word meaning and intonation when processing the reward value of utterances.
Thus, dogs seem to understand both human words and intonation, the study said.
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