Publications
Evaluating dynamics in affect structure with latent Markov factor analysis KU Leuven
In intensive longitudinal research, researchers typically consider the structure of affect to be stable across individuals and contexts. Based on an assumed theoretical structure (e.g., one bipolar or two separate positive and negative affect constructs), researchers create affect scores from items (e.g., sum or factor scores) and use them to examine the dynamics therein. However, researchers usually ignore that the affect structure itself is ...
The inferior fronto-occipital fasciculus correlates with early precursors of mathematics and reading before the start of formal schooling KU Leuven
Diffusion-weighted imaging studies in preschoolers have almost exclusively been done in the field of reading. As a result, virtually nothing is known about white matter tracts associated with individual differences in mathematics at this age. Studying the preschoolers’ brain is crucial because it allows us to identify individual differences in brain anatomy without influences of formal mathematics and reading instruction. To fill this gap, we ...
Stimulating preschoolers’ early literacy development using educational technology: A systematic literature review KU Leuven
Research interest in the potential of educational technology to support young children as they learn to read has significantly increased during the last decades. These studies typically adopt a media comparison approach (comparing learning with one instructional medium vs. another instructional medium) or a value-added approach (comparing learning with a standard version vs. one with an added feature). We aimed to systematically review both ...
Real-time detection of mean and variance changes in experience sampling data: A comparison of existing and novel statistical process control approaches. KU Leuven
Retrospective analyses of experience sampling (ESM) data have shown that changes in mean and variance levels may serve as early warning signs of an imminent depression. Detecting such early warning signs prospectively would pave the way for timely intervention and prevention. The exponentially weighted moving average (EWMA) procedure seems a promising method to scan ESM data for the presence of mean changes in real-time. Based on simulation and ...
A critical assessment of sparse PCA (research): Why (one should acknowledge that) weights are not loadings KU Leuven
Principal component analysis (PCA) is an important tool for analyzing large collections of variables. It functions both as a pre-processing tool to summarize many variables into components and as a method to reveal structure in data. Different coefficients play a central role in these two uses. One focuses on the weights when the goal is summarization, while one inspects the loadings if the goal is to reveal structure. It is well known that the ...
Individual-specific change points in circadian rest-activity rhythm and sleep in individuals tapering their antidepressant medication: An actigraphy study KU Leuven
Group-level studies showed associations between depressive symptoms and circadian rhythm elements, though whether these associations replicate at the within-person level remains unclear. We investigated whether changes in circadian rhythm elements (namely, rest-activity rhythm, physical activity, and sleep) occur close to depressive symptom transitions and whether there are differences in the amount and direction of circadian rhythm changes in ...
Children’s subtraction by addition strategy use and their subtraction-related conceptual knowledge KU Leuven
Dynamics of cognitive predictors during reading acquisition in a sample of children overrepresented for dyslexia risk KU Leuven
Literacy acquisition is a complex process with genetic and environmental factors influencing cognitive and neural processes associated with reading. Previous research identified factors that predict word reading fluency (WRF), including phonological awareness (PA), rapid automatized naming (RAN), and speech-in-noise perception (SPIN). Recent theoretical accounts suggest dynamic interactions between these factors and reading, but direct ...