Do children with obesity shift visual attention less efficiently?
Children with obesity were much slower than healthy-weight peers when a cue pointed the wrong way, and their brain responses to targets were smaller.
Source
The Neurocognitive Performance of Visuospatial Attention in Children with Obesity
Study at a glance
- Design
- Case-control — Obese vs healthy-weight children matched on fitness, IQ and parental education performed the Posner cueing task with concurrent EEG.
- N
- N=52 · 52 children aged 9-10: 26 obese and 26 healthy-weight controls.
- Population
- Right-handed children aged 9-10 from mainstream urban classrooms in Taiwan, without ADHD or neurological problems.
- Outcome
- Reaction times and errors on valid and invalid cue trials; target-evoked P3 latency and amplitude.
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What they did
The researchers tested 52 children aged 9-10, half with obesity and half healthy weight, matched on cardiorespiratory fitness, IQ and parental education and screened for ADHD. Each child did 180 trials of the Posner task, in which an arrow cue points left or right and a target then appears either where the cue pointed (valid) or on the other side (invalid), while EEG recorded the P3 brain response.
What they found
Error rates did not differ between groups. The obese group was slower overall, but the difference was concentrated in invalid trials (551.63 ms versus 447.11 ms), so the cost of redirecting attention was roughly twice as large (144.11 ms versus 77.51 ms). P3 latency did not differ, but P3 amplitude was markedly smaller in the obese group (8.32 versus 15.03 microvolts).
The limits
What it doesn't show
The design is cross-sectional, so it cannot show whether obesity impairs attention, attention problems contribute to weight gain, or a third factor drives both, a limitation the authors acknowledge. The sample is small and from one region, and only an endogenous (arrow-cue) task was used, so it is unknown whether automatic, stimulus-driven attention shifts are also affected. Metabolic factors such as insulin resistance were not measured, although the authors suggest they may matter.
Key terms
- Posner cueing paradigm
- A task where a cue directs attention to a location and a target then appears at the cued (valid) or uncued (invalid) location.
- Covert orienting
- Shifting attention to a location without moving the eyes.
- Inhibitory response effect
- Here, invalid-trial RT minus valid-trial RT: the cost of disengaging from the wrongly cued location.
- P3 component
- A positive ERP wave around 300 ms after a stimulus, thought to reflect allocation of attentional resources.
- Event-related potential (ERP)
- The averaged EEG response time-locked to a stimulus, giving millisecond-level timing of brain processing.
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Quiz yourself
On which trials did children with obesity respond most slowly relative to controls?
Common questions
Why match the groups on fitness and IQ?
Fitness and intelligence are known to affect cognition, so matching helps rule them out as explanations for group differences.
Does this mean obesity causes attention problems?
No. The groups were compared at one time point, so the direction of the relationship cannot be determined.
Why focus on invalid trials?
Invalid trials require disengaging from the cued side and shifting to the target, so slowing there points to weaker control of attention rather than general slowness.
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