Andrew J. Stier

Navigating Memorability Landscapes: Hyperbolic Geometry Reveals Hierarchical Structures in Object Concept Memory

This study uses hyperbolic geometry to show that object concepts are hierarchically organized, with memorability and typicality linked to their position in this structure.

Improvements in task performance after practice are associated with scale-free dynamics of brain activity

The paper finds that higher scale-free dynamics in brain activity, measured by the Hurst exponent, correlate with greater practice-related performance improvements across three different tasks.

Connectome-based predictions reveal developmental change in the functional architecture of sustained attention and working memory

The paper shows that functional brain networks predict sustained attention and working memory in children and adults, with WM networks changing more from preadolescence to adulthood.

Scale Invariance in fNIRS as a Measurement of Cognitive Load

This study tests if scale invariance measured by the Hurst exponent can quantify cognitive load using fNIRS during a working memory task, showing higher H during easier tasks.

A Scale-Free Gradient of Cognitive Resource Disruptions in Childhood Psychopathology

The paper shows a gradient of decreased Hurst exponent (H) with increased psychopathology and ADHD scores in children, predicting working memory performance and resource allocation imbalances.

Criterion Validity and Relationships between Alternative Hierarchical Dimensional Models of General and Specific Psychopathology

The paper evaluates bifactor and second-order models of psychopathology using ABCD Study data, finding both models have adequate psychometric properties but bifactor models offer clearer interpretation of associations with external variables.