movement/behavior test enclosure method visual cliff apparatus method 2017-12-14T12:50:46Z A method used to test depth perception and assess anxiety-related behaviors; the apparatus consists a a sheet of clear acrylic that covers a cloth with a high-contrast checkerboard pattern; one end of the cloth is placed immediately beneath the acrylic sheet while the other end is placed below the acrylic sheet, giving the appearance of depth while protecting the subject from actually falling. MMO:0000606 jesmith measurement_method_ontology