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Age-related differences in reaction time task performance in young children
Sergey Kiselev1, Kimberly Andrews Espy, Tiffany Sheffield
1Department of Clinical Psychology, Ural State University, Yekaterinburg 620083, Russian Federation. eskisa@rambler.ru
Insights
Age-related differences in reaction time (RT) processing speed are not global but depend on specific task demands. This study reveals process-specific variations in cognitive development during childhood.
Area of Science:
- Cognitive Psychology
- Developmental Neuroscience
- Human Behavior
Background:
- Investigating age-related differences in processing speed is crucial for understanding cognitive development.
- Previous research suggested a global mechanism for age-related processing speed differences.
- The current study examines task-specific demands influencing reaction time (RT) performance.
Purpose of the Study:
- To test the hypothesis that age-related processing speed differences are task-specific, not global.
- To compare reaction times (RTs) in children and adults across various cognitive tasks.
- To explore the implications for theories of brain development heterochronicity.
Main Methods:
- Utilized regression and transformation methods (Brinley, Madden, Ridderinkhoff, van der Molen).
- Assessed reaction time (RT) performance in 4- to 6-year-old children and adults.
- Employed tasks varying in response suppression, discrimination, rule reversal, and stimulus-response complexity.
Main Results:
- Age-related differences in processing speed varied significantly across different RT tasks.
- Children and adults showed notable RT differences in tasks requiring response suppression, discrimination, rule reversal, and complexity.
- These task-specific differences were often larger than predicted by a global processing speed model.
Conclusions:
- Age-related processing speed differences are not uniform but are influenced by specific cognitive demands.
- Findings support the concept of heterochronicity in brain development, with distinct developmental trajectories for different cognitive processes.
- The study highlights the importance of task-specific analyses in understanding developmental changes in cognitive processing speed.
Abstract:
Performance of reaction time (RT) tasks was investigated in young children and adults to test the hypothesis that age-related differences in processing speed supersede a "global" mechanism and are a function of specific differences in task demands and processing requirements. The sample consisted of 54 4-year-olds, 53 5-year-olds, 59 6-year-olds, and 35 adults from Russia. Using the regression approach pioneered by Brinley and the transformation method proposed by Madden and colleagues and Ridderinkhoff and van der Molen, age-related differences in processing speed differed among RT tasks with varying demands. In particular, RTs differed between children and adults on tasks that required response suppression, discrimination of color or spatial orientation, reversal of contingencies of previously learned stimulus-response rules, and greater stimulus-response complexity. Relative costs of these RT task differences were larger than predicted by the global difference hypothesis except for response suppression. Among young children, age-related differences larger than predicted by the global difference hypothesis were evident when tasks required color or spatial orientation discrimination and stimulus-response rule complexity, but not for response suppression or reversal of stimulus-response contingencies. Process-specific, age-related differences in processing speed that support heterochronicity of brain development during childhood were revealed.
