Newborn babies laugh like the non-human primate ancestors, scientists have learned.
Like chimpanzees, they breathe and breathe happily when they act.
In contrast, adults and older children often just laugh outside with a breath.
Psychologists explored the video of 44 babies and children between three months and 18 months in the game.
Dr. Dutch from the University of Amsterdam Disa Sauter, "Adult people sometimes laugh at the front, but this rate is different from laughing babies and chimpanzees," he said.
Iy The results we have achieved so far show that this is gradual rather than a sudden change. “
Records were analyzed by 102 psychology students assessing the degree to which babies breathe and look breathless.
The findings showed that the youngest babies often laughed as they breathe and enter.
But laughter from older babies was mainly produced in the whale.
The researchers also want to see if there is a connection that changes with age and triggers laughter.
Like non-human primates, infants and toddlers laugh when they tickle or enter other forms of physical play.
As people age, laughter begins to emerge from social interactions.
Sauter added: ek I want to see that our findings are more valid than laughter for other voices.
Bilir In conclusion, research can provide information about vocal production of children with developmental disorders.
Er If we normally know what developing babies look like, it might be interesting to investigate the risk of babies' emotional non-verbal voice calls to see if they have very early signs of atypical development. “
The findings were presented at the annual meeting of the American Acoustical Association in Victoria, Canada.– Press Association