Resources
Software, data, and demos from the lab that are ready for others to use. Code and data for individual papers are linked from the publications list.
Interactive demos
Visual Illusions Lab Web app
Eleven interactive visual illusions that run in the browser, from colour aftereffects and the lilac chaser to change blindness and the flash-grab effect. Each demo has live controls and explanations for adults and children, and a presentation mode runs them as a sequence for outreach events. Made for the “Can You Trust Your Eyes?” stand at the Research Days in Bergen.
Software
Demixing model Python package
A normative computational model of inter-item biases in memory and perception. It generates predictions for attraction and repulsion as a function of similarity and noise, and fits the model to data (GPU recommended).
Papers: Chetverikov (2023) Chetverikov & Hansmann-Roth (2026)
circhelp R package
Helper functions for circular data in cognitive studies of orientation, motion direction and other circular features — descriptive statistics, angular differences, correlation, and a correction for cardinal biases in human estimates.
apastats2 R package
Formats statistical results in APA style (
apa() for many test and model objects), with helpers for confidence intervals, summaries, and point-range plots with within-subject intervals.
JAX L-BFGS-B Python package
A JAX implementation of the L-BFGS-B bound-constrained optimiser that runs many independent starts as one vectorised batch on CPU or GPU, validated against reference test cases.
Data
Visual Search Database Database
A database of visual search datasets pooled across studies and labs, for re-use and for testing computational models on many datasets at once. A web app shows the data without setting up the database.
Teaching
Power analysis via simulations in R Tutorial
A short tutorial on power analysis by simulation, from t-tests and ANOVAs to hierarchical models, with practical exercises. First run at the TCTS graduate school for cognitive science students in 2020.