For children, sarcastic language can be difficult to understand. They generally begin to recognise sarcasm between ages 6 and 8, especially familiar sarcastic praise such as "Thanks a lot!" and "Nice going!"
However, some children take much longer to begin to understand sarcasm, with detection improving even through adolescence.
In a new study, published in the journal Frontiers in Psychology, Professor Penny Pexman from University of Calgary, Canada, and colleagues investigated whether differences in the ability of children to empathise with others might help to explain why.
The study involved 31 children between 8 and 9 years old in a task that required them to recognise sarcasm.
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After children watched a series of puppet shows that included either sarcastic or non-sarcastic praise, they were asked to pick up a "mean" toy shark if they believed that the puppets had spoken sarcastically, or a "nice" duck otherwise.
Each child was tested 12 times, with different puppets and scenarios. The empathy skills of the children were measured separately.
Children with stronger empathy skills were nearly twice as accurate as children with less advanced empathy skills. Initially, the researchers analysed a group of 6-7 year olds, but this age group revealed almost zero accuracy for sarcasm.
The researchers also quantified children's eye gaze and reaction time during the sarcasm recognition task, to quantify subtle clues about their understanding.
They measured whether the children looked toward the duck or the shark, as well as the time it took them to choose either. This gave more subtle clues about the children's understanding.
"This study helps us understand why some children deal better with this challenge than others and provides new insights about development of this complex aspect of emotion recognition," added Pexman.