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Published on: March 27, 2012
Eye tracking as an objective measure of hyperphagia in children with Prader-Willi syndrome
Alexandra P Key1, Hatun Zengin-Bolatkale1,2, Anastasia Dimitropoulos3
1Vanderbilt University Medical Center, Nashville, Tennessee.
Insights
Eye tracking reveals that children with Prader-Willi syndrome (PWS) show increased attention to food when hyperphagia is severe. This suggests gaze patterns may serve as objective markers for PWS research and clinical trials.
Area of Science:
- Neuroscience
- Genetics
- Pediatrics
Background:
- Prader-Willi syndrome (PWS) is a complex genetic disorder characterized by hyperphagia, a compulsive drive to eat.
- Objective measures are needed to assess hyperphagia severity and monitor treatment efficacy in PWS.
- Eye tracking technology offers a potential non-invasive method to evaluate behavioral responses related to feeding in PWS.
Purpose of the Study:
- To investigate the sensitivity of eye tracking measures to hyperphagia severity in children with Prader-Willi syndrome.
- To determine if gaze patterns differ between children with PWS and typically developing peers.
- To explore potential associations between eye tracking data, hyperphagia severity, nutritional phase, and genetic factors in PWS.
Main Methods:
- Gaze data were collected from 57 children with PWS (ages 3-11) and 47 typically developing controls.
- Participants engaged in free visual exploration of complex stimuli including food, animals, and household objects.
- Analysis focused on fixation counts, fixation duration, and gaze perseveration to assess visual attention patterns.
Main Results:
- Food items were not found to be exceptionally salient for children with PWS during visual exploration.
- Increased attention to food, particularly alongside other high-interest items like animals, correlated with caregiver-reported hyperphagia severity and advanced nutritional phase.
- Preliminary evidence suggested potential differences based on genetic subtype and sex, and the protocol's implementability across multiple sites was confirmed.
Conclusions:
- Gaze characteristics derived from eye tracking show promise as objective biomarkers for hyperphagia in Prader-Willi syndrome.
- Eye tracking can differentiate attention patterns related to feeding behaviors in PWS.
- These findings support the utility of eye tracking in PWS research and clinical trials for assessing hyperphagia.
Abstract:
This study examined sensitivity of eye tracking measures to hyperphagia severity in Prader-Willi syndrome (PWS). Gaze data were collected in 57 children with PWS, age 3-11 years, and 47 typically developing peers at two study sites during free visual exploration of complex stimulus arrays that included images of food, animals, and household objects. Analysis of the number and duration of fixations as well as gaze perseverations revealed that food items are not exceptionally salient for children with PWS. Instead, increased attention to food in the context of other high-interest items (e.g., animals) was associated with caregiver reports of more severe hyperphagia and more advanced nutritional phase. The study also provided preliminary evidence of possible genetic subtype and sex differences as well as demonstrated that multiple investigators in a wide range of settings can effectively implement the eye tracking protocol. The results indicate that gaze characteristics derived from eye tracking may be a promising objective marker of hyperphagia in PWS for use in research and clinical trials.
