1. A system for user verification, comprising: a security component comprising a test generation component for generating one or more automated tests that rely on a plurality of human vision properties comprising at least persistence of vision and simultaneous contrast wherein simultaneous contrast comprises enhancement or diminishment, relative to normal, of perception, cognition and related performance as a result of immediately previous or simultaneous exposure to a stimulus of lesser or greater value in the same dimension, to differentiate a human user from an automated entity, wherein the test generation component further comprises a segmenting component which segments a target image into a grid of segments of predetermined sizes, and a frameset generation component for generating at least one frameset for at least one of the automated test, wherein the frameset generation component further comprises one or more of a color mapping component that determines which pixels of the target image are positive and where to put negative whitespace data prior to generating the frameset or a noise generation component that introduces noise into each frame of the frameset; a communication component configured to execute one or more of transmission of the tests to one or more access requestors or reception of responses from the access requestors; and a nontransitory computer readable medium having stored thereon one or more of the security component or the communication component.