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Updated: Oct 6, 2025
Eye Tracking Young Children with Autism
Published on: March 27, 2012
Comparison of Visual Fixation Trajectories in Toddlers with Autism Spectrum Disorder and Typical Development: A
Francesco Masedu1, Roberto Vagnetti1, Maria Chiara Pino1,2
1Department of Applied Clinical Sciences and Biotechnology, University of L'Aquila, 67100 L'Aquila, Italy.
Insights
Eye-tracking reveals distinct visual exploration patterns in toddlers with autism spectrum disorder (ASD). Analyzing fixation sequences, particularly "no-stimulus fixation," helps differentiate ASD from typical development (TD) and identify challenges in stimulus engagement.
Area of Science:
- Neurodevelopmental disorders
- Cognitive neuroscience
- Pediatric psychology
Background:
- Autism spectrum disorder (ASD) is a neurodevelopmental condition characterized by altered visual attention and search strategies.
- Eye-tracking technology offers a sensitive method for detecting subtle changes in visual processing in young children.
- Understanding visual exploration patterns is crucial for early identification and intervention in ASD.
Purpose of the Study:
- To investigate and differentiate visual exploration patterns between toddlers with ASD and typically developing (TD) toddlers using eye-tracking.
- To model fixation sequences and transition probabilities between areas of interest (AOIs) to identify group-specific behaviors.
- To explore the role of 'no-stimulus fixation' in distinguishing visual search strategies in ASD.
Main Methods:
- An eye-tracking paradigm was employed with 18 toddlers with ASD and 18 TD toddlers (12-36 months).
- Participants viewed a face alongside a series of objects, with eye gaze recorded across 'Face', 'Object', and 'No-stimulus fixation' AOIs.
- Markov chain modeling was used to analyze fixation sequences and calculate transition probabilities between AOIs.
Main Results:
- Transition probabilities between AOIs significantly differentiated toddlers with ASD from TD toddlers.
- Visual exploration patterns were found to be strictly conditioned by previous fixations, with 'no-stimulus fixation' playing a critical role in group differentiation.
- Individuals with ASD demonstrated difficulties in engaging with stimulus exploration compared to TD peers.
Conclusions:
- Eye-tracking and Markov chain analysis of fixation sequences can effectively distinguish visual exploration patterns in toddlers with ASD versus TD.
- The 'no-stimulus fixation' behavior is a key indicator of altered visual search strategies in young children with ASD.
- These findings have implications for refining clinical evaluations and developing targeted interventions for ASD by incorporating visual exploration dimensions.
Abstract:
Autism spectrum disorder (ASD) is a neurodevelopmental condition in which visual attention and visual search strategies are altered. Eye-tracking paradigms have been used to detect these changes. In our study, 18 toddlers with ASD and 18 toddlers with typical development (TD; age range 12-36 months) underwent an eye-tracking paradigm where a face was shown together with a series of objects. Eye gaze was coded according to three areas of interest (AOIs) indicating where the toddlers' gaze was directed: 'Face', 'Object', and 'No-stimulus fixation'. The fixation sequence for the ASD and TD groups was modelled with a Markov chain model, obtaining transition probabilities between AOIs. Our results indicate that the transition between AOIs could differentiate between toddlers with ASD or TD, highlighting different visual exploration patterns between the groups. The sequence of exploration is strictly conditioned based on previous fixations, among which 'No-stimulus fixation' has a critical role in differentiating the two groups. Furthermore, our analyses underline difficulties of individuals with ASD to engage in stimulus exploration. These results could improve clinical and interventional practice by considering this dimension among the evaluation process.
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