Assessing true and false belief in young children with cerebral palsy through anticipatory gaze behaviours: a pilot study.
Eye-tracking anticipation can reveal hidden theory-of-mind skills in children who cannot speak or point.
01Research in Context
What this study did
Researchers watched where five nonverbal preschoolers looked while a short puppet show played. Two kids had cerebral palsy, three had Down syndrome. None could talk or point, so the team used eye tracking to see if the children expected a character to search in the right spot.
The task tested true belief first: the puppet saw where the toy was hidden. Then it tested false belief: the puppet left, the toy moved, so the puppet now held a wrong idea. Kids who understand false belief look ahead to the old, now-empty spot.
What they found
All five children looked to the correct hiding place on true-belief trials. Two of them—one with CP and one with Down syndrome—also glanced to the empty location on false-belief trials. Their eyes hinted they knew the puppet held a false belief even though they could not say or sign the answer.
How this fits with other research
Richman et al. (2001) showed that classic Sally-Anne tasks work well for verbal children with autism. Tavassoli et al. (2012) extends that line by giving an option for kids who cannot speak or move. The new method does not replace the old; it opens the door for children the old tests leave out.
Estes et al. (2011) also ran a tiny pilot with nonverbal children, but they looked for signs of pain instead of mind-reading. Both studies prove that careful eye coding can squeeze reliable data from a small, hard-to-test group.
Jover et al. (2014) tested Down syndrome preschoolers too, yet focused on how they plan peg-moving moves. Together the papers remind us that these kids have hidden strengths—motor or cognitive—that standard tests can miss.
Why it matters
If you work with nonverbal clients, add eye-tracking anticipation to your toolbox. A 30-second video and a cheap webcam can tell you whether a child graces false-belief tasks or still needs teaching. Start with true-belief clips to check that the child understands the setup, then probe false belief. No verbal prompt or motor response required—just watch the eyes.
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02At a glance
03Original abstract
Children with a clinical description of cerebral palsy (CP) commonly experience cognitive and sensory difficulties that co-occur with motor impairment, and for some children this can include impairments in social communication. While research has begun to examine theory of mind abilities in children with CP, relatively little is known about social communication difficulties in this population. Assessing theory of mind abilities in children with CP using traditional procedures such as the classic Sally-Anne task can be problematic if performance is affected by physical difficulties in signalling responses and/or by cognitive and language demands inherent to the task itself. The central aim of this study therefore was to examine the potential of using a new action anticipation task and eye-tracking technique to assess implicit true and false belief understanding in four developmentally young children with quadriplegic cerebral palsy who had little or no functional speech, and one language age matched child with Down syndrome who did not have severe motor impairment. All children in this study consistently demonstrated anticipatory gaze behaviours in the context of the true belief task. One child with CP and the child with Down syndrome demonstrated anticipatory gaze behaviours indicative of an ability to attribute false belief. The findings are discussed in relation to the application of action anticipation and eye-tracking paradigms in research and clinical practice.
Research in developmental disabilities, 2012 · doi:10.1016/j.ridd.2012.05.009