遂行機能と寸法変化カード並べ替えタスク
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Q1: What are the three main executive processes children use to complete tasks?
Children rely on inhibition to stop current actions, planning to determine necessary steps, and attentional control to stay focused until completion. For example, stopping play, organizing room-cleaning steps, and maintaining focus throughout demonstrates all three processes working together. A breakdown in any step prevents task completion.
Q2: Why do 3-year-olds struggle more than 5-year-olds on the Dimensional Change Card Sort Task?
Three-year-olds fail to inhibit recently learned patterns of thinking and acting when switching from color-sorting to shape-sorting. Their prefrontal cortex, which manages executive function, is still developing. In contrast, most 5-year-olds successfully transition to new rules, indicating emerging executive function development.
Q3: How does the prefrontal cortex development affect decision-making across childhood and early adulthood?
The prefrontal cortex matures slowly, continuing to develop well into an individual's twenties. This developmental lag explains why even intelligent people make poor decisions, such as choosing short-term party benefits over long-term study benefits. Brain maturation directly supports improved executive function and decision-making.
Q4: What happens during the pre-switch and post-switch phases of the card sort task?
During the pre-switch phase, children learn to focus on one feature, like color, while ignoring shape. In the post-switch phase, the sorting rule changes to shape, requiring children to shift attention to the previously ignored dimension and overcome their established response patterns. Post-switch correct responses measure executive function.
Q5: How can the Dimensional Change Card Sort Task help identify developmental disorders?
Researchers use permutations of this task diagnostically to identify children with particularly poor executive function, which may indicate developmental delay or clinical disorders such as ADHD or Autism Spectrum Disorder. Performance patterns reveal deficits in inhibition, planning, or attentional control underlying these conditions.
Q6: What score on the post-switch trials indicates a child has passed the executive function assessment?
A child scoring 80 percent or higher on post-switch trials is considered to have passed the Dimensional Change Card Sort Task assessment. This threshold reflects successful executive function development. On average, 5-year-olds pass while 3-year-olds do not, highlighting a critical developmental period.
Q7: How do researchers investigate the neural mechanisms underlying executive function performance?
Researchers combine the Dimensional Change Card Sort Task with functional magnetic resonance imaging to examine brain activity during card sorting. Findings reveal age-related differences in connectivity within the lateral prefrontal and anterior cingulate cortices, providing insights into how children solve problems using causal reasoning and neural organization.