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## WHAT IS IT?

The motion quartet is a well-known paradigm in the study of perception of apparent motion. We perceive either vertical or horizontal motion, with spontenous switches between the two percepts. Several studies have demonstrated hysteresis in the switches between percepts (e.g., Ploeger, A., Van Der Maas, H. L. J., & Hartelman, P. A. I. (2002). Stochastic catastrophe analysis of switches in the perception of apparent motion. Psychonomic Bulletin & Review, 9(1), 26-42. https://doi.org/10.3758/BF03196255).

## HOW IT WORKS

Jumps and hystersis occur by manipulating the aspect ratio, i.e., the horizontal distance divided by the vertical distance.

## HOW TO USE IT

With horizontal-distance and vertical-distance you can manipulate the aspect ratio.
Interval-time controls the speed of the movement.
When Experiment is on, the aspect ratio changes slowly. Press H and V to indicate whether you see horizontal or vertical motion.
Other controls manipulate the stimuli.

## THINGS TO NOTICE

Check if the perception is characterized by jumps and hysteresis

## THINGS TO TRY

By using different objects for the two pairs of stimuli, percepts are expected to be more stable.

## EXTENDING THE MODEL

Rore quartets or more complex configurations