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The Simon task is a psychological test where participants respond to the color of a stimulus, ignoring its spatial location, to measure the effect of spatial cues on reaction time and cognitive control.

This code can be put at the start of an experiment to control angular image size. It estimates viewing distance from a blind-spot task and other info. See https://doi.org/10.1167/jov.21.8.19, and https://pavlovia.org/run/janbrascamp/blind_spot/html/

Basic demo of the Colavita task

Colavita, F.B. Human sensory dominance. Perception & Psychophysics 16, 409–412 (1974). https://doi.org/10.3758/BF03203962

For review see:

Hirst RJ, Cragg L, Allen HA. Vision dominates audition in adults but not children: A meta-analysis of the Colavita effect. Neurosci Biobehav Rev. 2018 Nov;94:286-301. doi: 10.1016/j.neubiorev.2018.07.012. Epub 2018 Jul 23. PMID: 30048672.

The Visual Preference for Facial Expressions task uses eye tracking to measure how long people look at different emotional expressions (like happy or sad faces) to understand attentional biases.

This demo presents food items and measures viewers’ facial expressions in real time using PsychoJS Face API, without saving webcam video.

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A demo based on the Eriksen Flanker paradigm. Participants respond to the direction of a central arrow, whilst ignoring distracting flankers.

Collins et al. RLWM behavioral task + trauma related scales