20 June 2019, 16:00
Grey seals can copy human speech and songs using the same sound production mechanisms as humans, new research carried out at the University of St Andrews has found.
The study, published today in the journal Current Biology, found that seals could be a new model system to study speech disorders.
Researchers Dr Amanda Stansbury and Professor Vincent Janik, of the Scottish Oceans Institute (SOI) at the University of St Andrews, worked with three young grey seals and monitored them from birth to determine their natural repertoire.
These seals were then trained to copy new sounds by changing their formants, the parts of human speech sounds that encode most of the information that we convey to each other.
Zola, one of the seals, was particularly good at copying melodies that were played to her, copying up to ten notes of songs such as Twinkle twinkle little star and other popular themes. Two other seals were taught combinations of human vowel sounds that they copied accurately.
Lead researcher Dr Amanda Stansbury, who now works at El Paso Zoo in Texas, said: “I was amazed how well the seals copied the model sounds we played to them.
“Copies were not perfect but given that these are not typical seal sounds it is pretty impressive. Our study really demonstrates how flexible seal vocalisations are. Previous studies just provided anecdotal evidence for this.”
Professor Vincent Janik, Director of the SOI at the University of St Andrews, said: “This study gives us a better understanding of the evolution of vocal learning, a skill that is crucial for human language development.
“Surprisingly, nonhuman primates have very limited abilities in this domain. Finding other mammals that use their vocal tract in the same way as us to modify sounds informs us on how vocal skills are influenced by genetics and learning and can ultimately help to develop new methods to study speech disorders.”
University of St Andrews
A video of the seals is available online at https://youtu.be/-ahW_f5Sd3Q
The paper, Formant Modification through Vocal Production Learning in Grey Seals, by Amanda L Stansbury and Vincent M Janik, is published in Current Biology and is available via the DOI: https://doi.org/10.1016/j.cub.2019.05.071
Issued by the University of St Andrews Communications Office.