The conflict procedure is an experiment widely used in scientific research to quantify anxiety levels through measuring changes in punished/unpunished responding. It is often used to screen drugs for anxiolytic potential.
Some researchers from France have conducted an experiment on "Effects of Chronic Antidepressants in an Operant Conflict Procedure of Anxiety in the rat (1998)", "the aim of their study was to reveal possible anxiolytic like effects of antidepressants on chronic treatment. Rats were subjected to a conflict procedure during which lever pressing for food was suppressed by a conditioned signal for punishment and contingent electric foot shocks." In order to operate the experiment, researchers build anxiety by electrical shocks on rats gradually through a training in serval week. This process was what researchers called Conflict Procedure.
^Beaufour, C. C., Ballon, N., Le Bihan, C., Hamon, M., & Thiébot, M. (1999). Effects of chronic antidepressants in an operant conflict procedure of anxiety in the rat. Pharmacology, Biochemistry And Behavior, 62(4), 591-599. doi:10.1016/S0091-3057(98)00180-4