F. L. Bookstein

Bridging geometric morphometrics to medical anatomy: An example from an experimental study of the human smile

This paper introduces a method combining morphometrics and psychometrics to analyze facial expressions, showing differences in muscle dynamics between open-lip and closed-lip smiles.

Quadratic trends: a morphometric tool both old and new

This paper introduces a geometric method using quadratic trend surfaces to analyze morphometric data, offering new insights beyond traditional Procrustes and thin-plate spline approaches.

Pathologies of Between-Groups Principal Components Analysis in Geometric Morphometrics

This paper identifies and quantifies two major failures of between-groups PCA in high p/n settings, warning against its use in geometric morphometrics without validation.