'Hungry Eyes': visual processing of food images in adults with Prader-Willi syndrome.
Adults with PWS-deletion spot food makeup in a blink, while UPD adults spot edibility—tailor what you hide.
01Research in Context
What this study did
Scientists showed food pictures to adults with Prader-Willi syndrome while recording brain waves.
They compared two genetic forms: deletion and UPD. The goal was to see how fast each group spots food cues.
What they found
Deletion adults locked onto food makeup within 100 milliseconds.
UPD adults locked onto whether the item was edible, not its makeup.
Same pictures, different first filter.
How this fits with other research
van den Broek et al. (2006) saw no reward-center spark when PWS adults rated favorite foods. O'Reilly et al. (2008) now show the brain still tags food cues early, just by different rules for each subtype.
Hogg et al. (1995) warned that satiety signals are weak in PWS, so external food locks are vital. The new data say you may need slightly different locks: hide food makeup for deletion clients, hide edibility cues for UPD clients.
Eisenhower et al. (2006) linked ritual strength to eating severity in preschoolers. The ERP split hints the link may start with how the child’s genetic subtype first scans food images.
Why it matters
You already keep food out of sight. Now ask: Does this client have deletion or UPD? If deletion, cover nutrition labels and bulk packages. If UPD, cover bite-size or ready-to-eat items. One small change matches their first visual filter and may cut grabbing.
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02At a glance
03Original abstract
BACKGROUND: Prader-Willi syndrome (PWS) is a genetic disorder associated with intellectual disabilities, compulsivity, hyperphagia and increased risks of life-threatening obesity. Food preferences in people with PWS are well documented, but research has yet to focus on other properties of food in PWS, including composition and suitability for consumption. It is also unclear how food perceptions differ across the two major genetic subtypes of PWS. METHODS: This study examined neural responses to food stimuli in 17 adults with PWS, nine with paternal deletions and eight with maternal uniparental disomy (UPD), and in nine age-matched typical controls. Visual event-related potentials (ERPs) were recorded in response to food images varying in food composition and suitability for consumption during a passive viewing paradigm. RESULTS: Group differences were observed for the N1 and P3 responses reflecting perceptual categorisation and motivational relevance respectively. The deletion group categorised food stimuli in terms of composition while the UPD group performed more similar to the controls, and focused on the suitability of food for consumption. Individual differences in N1 amplitude correlated with body mass index and scores on the Hyperphagia Questionnaire. CONCLUSION: Differences are seen in how people with PWS because of deletion or UPD perceive visual food stimuli even within the first milliseconds of stimuli exposure. Implications are discussed for in vivo food behaviours and for future ERP or neuroimaging studies on hunger, satiety and food perception in PWS.
Journal of intellectual disability research : JIDR, 2008 · doi:10.1111/j.1365-2788.2008.01062.x