<qa>  What is the phasic explicit-cue associated with?During aversive conditioning in which a phasic explicit-cue e.g., a light is repeatedly associated with an aversive unconditioned-stimulus e.g., a shock, the organism develops fear to the explicit cue as well as to the environmental context in which the experiment took place. We have obtained preliminary evidence suggesting that contextual fear represents aspects of aversive states that are central to anxiety disorders. In this protocol, we seek further evidence for the relevance of contextual fear to mood anxiety disorders. 