Dogs may not get every word we say, but their brains seem to pick up on tone and meaning in ways that are remarkably similar to human understanding, writes ckbergland
. These conjunction words were also said repeatedly using positive or neutral intonation. Conjunction words were used in the second part of this experiment because they're usually woven into everyday speech and aren't associated with any specific context nor do they have lexical meaning to dogs.
By comparing how the dog brain responded to hearing"praise words" vs."meaningless words" spoken with a positive or neutral intonation, the researchers were able to identify speech processing hierarchy in the dog brain. As the authors explain: "Our findings suggest that dogs, similarly to humans, process emotional prosodic cues in spoken words at lower levels and lexical information at higher levels of the auditory processing hierarchy. Prosody processing was thus subcortically independent of lexical cues, prosody influenced lexical processing in a near-primary cortical region and, finally, lexical processing was independent of prosodic cues in a secondary auditory cortical region.
This two-minute YouTube video recaps the significance of this research on"Speech Processing Hierarchy in the Dog Brain." "Although speech processing in humans is unique in many aspects, this study revealed exciting similarities between us and a speechless species. The similarity does not imply, however, that this hierarchy evolved for speech processing" senior author
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