1. A method for generating a human likeness score based on a Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) provided through a graphical interface, the method comprising: generating the CAPTCHA comprising the graphical interface and a first object and a second object depicted within the graphical interface; pseudorandomly assigning a visual characteristic of the first object within the graphical interface to differentiate the CAPTCHA from a previously-generated CAPTCHA, the first object distinct from the second object by the visual characteristic; assigning an instruction for solving the CAPTCHA based on the visual characteristic of the first object; receiving a user solution to the CAPTCHA; receiving a user interaction pattern descriptive of an interaction undertaken by a user, through the graphical interface, to enter the user solution; determining an accuracy of the user solution in satisfying the instruction for solving the CAPTCHA; comparing the user interaction pattern to an interaction model generated from interaction patterns of previous users; and calculating the human likeness score based upon the accuracy of the user solution and the comparison of the user interaction pattern to the interaction model, the human likeness score lying within a continuum of human likeness scores.