be studied more than thirty years later. In 2004, Mohammad-Reza Zarrindast and Ameneh Rezayof studied mice, to see how memory and learning were affected by morphine. They found that when mice learned a response under the influence of morphine, they later performed it most efficiently under the influence of morphine. When mice learned the response free of morphine, they recalled it best when similarly sober. And for mice that were taught the response under the influence of morphine, once the drug wore off, they suffered amnestic effects; they could no longer remember the learned response. The results of each of these studies points to the existence of a state-dependent memory phenomenon. Further research on the subject continues to be carried out today in order to discover further implications of state-dependent memory or other situations in which state-dependent memory might take place. In 1979, Reus, Post, and Weingartner, found that when a person is depressed they find it nearly impossible to think of a time in the past when they were happy. The longer they were depressed the more impossible the task became. They attributed this to the mind taking control of how the person felt. The person feels nothing but misery so, therefore, that is what their whole life must have been like both before and after the depression to hold. In 1999 a psychiatry journal was published on the topic of spouse abuse. The main topic of discussion was about men who would abuse their wives, sometimes even killing them and having no memory of the event afterward. At first they were just thought to be lies but with later findings they found that many convicts have said the same thing. They remember the time before the attack and after, but have no memory of the attack itself. One man described it as everything going red as though he had blacked out. In this journal it is discussed that state-dependent memory might be to blame. The thought process behind this theory is that the individuals experience what is known as limited amnesia. This form of amnesia is specific towards one event that has been forgotten. The idea is that the person got so mad/angry at their spouse that they cannot recall what they did because it is so out of character for them. This could be attributed to the person choosing not to remember and losing the memory or