This is a basic Eriksen flanker task.

The classic Stroop task.

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/

Use the middle line to represent force response signal

GFMT (Burton et al 2010) is a face perception task to test the ability to tell two faces are the same person