Development of task switching and post-error-slowing in children
Rashmi Gupta1, Bhoomika R Kar, Narayanan Srinivasan
1Centre of Behavioural and Cognitive Sciences, University of Allahabad, Allahabad, 211002, India. rash_cogsci@yahoo.com.
Insights
Executive functions like task switching and error processing develop non-gradually in children. Inhibition may be a shared mechanism, but task set maintenance differs between these executive control processes.
Area of Science:
- Cognitive Neuroscience
- Developmental Psychology
- Human Behavior
Background:
- Executive control processes, including task switching and error processing, undergo significant changes during childhood development.
- Understanding the underlying mechanisms of these executive functions is crucial for cognitive development research.
Purpose of the Study:
- To investigate whether task switching and error processing share common developmental mechanisms.
- To explore the developmental trajectory of executive control from a child development perspective.
Main Methods:
- 180 children aged 6-11 years performed digit identification and counting tasks.
- Switch costs were calculated based on response-repetition, stimulus-response (S-R) compatibility, and post-error slowing.
- Reaction time (RT) distributions were analyzed to understand performance changes.
Main Results:
- Switch costs decreased between ages 7-10, with S-R compatibility effects observed in younger children (6-9 years).
- Reaction times (RTs) decreased significantly in older children (9-11 years), particularly in fast and slow trials.
- Error processing showed a developmental pattern similar to response-repetition switch costs, suggesting a common inhibitory mechanism.
Conclusions:
- Task switching and error processing development is not linear but shows distinct patterns.
- Inhibition appears to be a shared mechanism underlying both task switching and error processing.
- The ability to maintain task set specifically characterizes task switching, differentiating it from error processing.
Background:
Executive control processes such as task switching and error processing have been shown to change with age. The present study explored from a developmental perspective whether shared or different mechanisms underlie these processes.
Methods:
The sample included 180 children (30 in each of the six age groups from 6-11 years) who were required to perform two different tasks: identification of a digit, or counting the number of digits. We computed switch costs as a function of response-repetition, stimulus-response (S-R) compatibility, and post-error-slowing. We also analyzed reaction time distributions.
Results And Discussion:
The results showed a switch cost in the response-repetition condition, with a reduction in switch cost between 7 to 8 and 9 to 10 years of age, and an S-R compatibility effect in 6 to 9 years old children. Reaction time (RT) distributions showed that the decrement in the switch cost is due to the overall decrease in RTs in fast (5th percentile) trials in 9 to 11 year olds, and slow (95th percentile) trials in 7 to 8 and 9 to 11 years old children, in both the task switch and non-switch trials. A major reduction in RT was found between 9 to 11 years in both the response type and S-R compatibility type conditions. RT distributions for post-error trials revealed that the large decrement seen in 7 to 8 and 9 to 10 years old children is primarily due to the sudden decrease in RTs in the fast and slow trials respectively. The developmental pattern of error processing was similar to one component of task switching (switch cost of the response-repetition condition), indicating that inhibition could be a common mechanism underlying both the processes. However, the failure to maintain task set was found only with task switching.
Conclusion:
The development of task switching and error processing is not gradual. The developmental pattern of error processing is similar to that of the switch cost of the response-repetition condition in task switching, indicating that inhibition could be a common mechanism underlying both processes. The present results have implications for theories of executive control.
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