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The role of interval underestimation in hyperactive children's failure to suppress responses over time
E J Sonuga-Barke1, T Saxton, M Hall
1Department of Psychology, University of Southampton, UK.
Insights
Hyperactive children struggle with time estimation, not response inhibition. This study suggests hyperactivity may involve time misperception rather than disinhibition.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Psychology
Background:
- Hyperactivity is often characterized as a disinhibition problem.
- The interplay between response inhibition and time estimation in hyperactivity requires further investigation.
Purpose of the Study:
- To investigate the relationship between response inhibition and time estimation in hyperactive and non-hyperactive children.
- To examine whether hyperactivity is primarily a deficit in disinhibition or time estimation.
Main Methods:
- Children performed a discrete trials intertemporal response task under signaled and unsignaled conditions.
- Response inhibition was assessed by requiring children to respond within a 2s window, delayed by 5s or 15s.
- Time estimation was crucial in the unsignaled condition, where facial cues were obscured.
Main Results:
- Both hyperactive and non-hyperactive children effectively inhibited responses when signaled.
- All children made more errors in the unsignaled condition, indicating challenges with time estimation.
- Hyperactive children showed a tendency to respond prematurely in the unsignaled condition.
Conclusions:
- The findings do not support the notion that hyperactivity is solely a disinhibition deficit.
- Hyperactivity may be linked to difficulties in time estimation, suggesting a role for temporal processing.
- Further research is needed to explore the role of time misperception in hyperactive disorders.
Abstract:
The relationship between response inhibition and time estimation abilities was investigated in a group of hyperactive and non-hyperactive children. Children performed a discrete trials intertemporal response task under two conditions. Under both conditions children had to respond within a 2 s window, which was delayed for a set period (either 5 or 15 s). In condition one (signalled condition), these response requirements were signalled by changes in the expression of a face drawn on a computer screen. In condition two (unsignalled condition), always presented on the trial following the signalled condition, these changes in expression were obscured by a hand drawn over the mouth of the face so that effective performance depended on the childs ability to estimate the point at which the facial expression changed on the preceding trial. Both groups of children had little difficulty inhibiting responses when the response requirements were signalled. All children made far more errors under the unsignalled condition. Hyperactive children displayed a systematic tendency to respond before the response window occurred. Taken together, these data give no support to the idea that hyperactivity is essentially a problem of disinhibition and raise interesting questions about the role of time mis-estimation in the disorder.