Developmental Trajectories in Primary Schoolchildren Using n-Back Task.

Area of Science:

• Childhood cognitive development
• Neuropsychological assessment
• Epidemiological studies

Background:

• Need for neuropsychological tools to assess cognitive development in children for epidemiological studies.
• Improving neurodevelopment characterization to identify determinants of cognitive trajectories.
• Aim to evaluate if repeated n-back task measures detect developmental trajectories in schoolchildren over one year.

Purpose of the Study:

• To determine if repeated administration of the n-back task can identify cognitive developmental trajectories in schoolchildren.
• To characterize cognitive growth patterns over a one-year period.
• To explore factors influencing these trajectories.

Main Methods:

• Administered the n-back task (2- and 3-back levels, numbers and words stimuli) to 2897 children aged 7-11 years.
• Collected data over four sessions from January 2012 to March 2013.
• Utilized linear mixed-effects models with random effects for school, individual, and age to analyze trajectories.

Main Results:

• Observed age-related improvements in n-back performance (d', HRT, accuracy), with diminishing growth at older ages.
• Found greater performance improvements in younger children, with the 2-back task, verbal stimuli, and girls.
• Children with Attention Deficit and Hyperactivity Disorder (ADHD) symptoms showed lower baseline working memory but similar growth trajectories in number-based tasks, except for response speed.

Conclusions:

• Repeated n-back task measures effectively reflect cognitive developmental trajectories in children over a one-year period.
• Suggests the n-back task is a valuable tool for studying factors influencing cognitive development during childhood.
• Highlights differences in cognitive development based on age, task complexity, stimuli type, sex, and ADHD symptoms.