Explore the BioMotion Lab demos to experience core ideas in biological motion and perception. These quick, interactive tools show how sparse visual information still supports rich recognition. You can try the classic BML Walker and a perception task called “Guess the Sex,” then compare how cues, noise, and viewing conditions change what you see.
BML Walker
The BML Walker is part of the BioMotion Lab demos. It renders point-light figures—dots placed at key joints—that evoke a walking human with minimal detail. Although each dot is simple, your visual system groups motion into a coherent person.
How to use it: adjust viewpoint, speed, and noise. Then switch on/off specific joints or limbs. As you vary parameters, note how recognition holds up or fails. This demo illustrates the role of motion trajectories, global form, and biological constraints in perception.
Guess the sex
Guess the Sex” belongs to our interactive biological motion demos. You will watch point-light walkers and decide whether each motion looks more typically male or female. Subtle differences in gait, stride length, and hip/shoulder rotation bias judgments.
How to use it: start a short run, make your choices, and view feedback. Then, repeat with different noise levels or viewpoints. This demo highlights how tiny kinematic cues influence categorical perception and decision confidence.
BML Rating
The BioMotionLab's Web-Based Point Light Walker Rating Tool (BMLRating) is a web application that allows a registered user to create simple visual perception rating tool where you can specify an attribute and also the beginning and end of its range for rating the walkers based on them. Therefore, after completing the form, you will be presented with random point light walkers that you can rate them based on the attribute chosen by selecting a button between the six buttons available. Once you are done, by clicking on Done button, the subject will be presented, showing the stimuli with a slider. By changing the slider value, the walker stimuli will be updated depending on the rating results.