Behavioral/Cognitive Functional Maturation of the Executive System during Adolescence

Vocabulary flashcards covering key concepts, task paradigms, brain networks, and methodological tools from the lecture on executive system functional maturation in adolescence.

Working Memory (WM)

The architecture of executive function defined as the ability to keep information in a buffer where further processing may occur.

Fractal N-Back Task

An fMRI paradigm used to probe working memory function by presenting complex geometric figures for $500\,\text{ms}$ across $0\text{-back}$, $1\text{-back}$, and $2\text{-back}$ conditions without lexical processing confounds.

Signal Detection Measure ($d'$)

A summary metric of task performance that incorporates both correct responses and false positives to limit the influence of response bias.

Executive Network

A fronto-parieto-cerebellar brain network recruited during increased working memory load ($2\text{-back} > 0\text{-back}$), encompassing the dorsolateral prefrontal cortex, paracingulate cortex, frontal pole, anterior insula, superior parietal cortex, precuneus, anterior thalamus, and cerebellar crus I and II.

Default Mode Network (DMN)

A network of nonexecutive brain hubs—including the ventromedial prefrontal cortex, posterior cingulate cortex, hippocampus, and lateral temporal cortex—that exhibits deactivation or suppression during demanding working memory performance.

Philadelphia Neurodevelopmental Cohort (PNC)

A population-based study collaboration between Children's Hospital of Philadelphia and the University of Pennsylvania examining genomic, clinical, and neuroimaging data in youths aged $8$ to $22$ years.

Penn Computerized Neurocognitive Battery (CNB)

An out-of-scanner cognitive assessment tool comprising $14$ tests, used to derive executive function summary scores across abstraction/flexibility, attention, and working memory domains.

PREDICT

A multivariate pattern regression algorithm adapted for high-dimensional neuroimaging data that utilizes cross-validated feature selection to accurately predict continuous behavioral variables from whole-brain activation maps.

Watershed Algorithm

An image processing method applied to functional activation maps to parse contiguous voxel clusters into discrete functional subregions of interest based on local intensity maxima.

Mediation Model of Executive Functional Maturation

A statistical framework demonstrating that multivariate patterns of brain activation significantly mediate $38\%$ of the variance ($p = 3.4 \times 10^{-6}$, $n = 841$) in age-related working memory performance gains during adolescent development.

Sobel's Test

A statistical test used to evaluate the significance of an indirect pathway in a mediation analysis, confirming whether a mediator variable significantly accounts for the relationship between an independent variable and an outcome variable.

Functional Maturation

The developmental process during adolescence whereby cognitive capability improves due to an enhanced ability to recruit task-positive executive brain networks and reciprocally suppress default mode network activity.