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Stress is known to be among the main causal factors of melancholy (Kendler, Karkowski, & Prescott, 1999). Massive stressors in existence, such as divorce or death in the household, are all known to be about the growth of depression in individuals (Kendler et al., 1999). Such traumatic, sudden events can put acute stress on a individual which can lead to problems such as depression. But equally as stressful to people is chronic stress - less stressful as major stressors, but still pervasive enough day-to-day to contribute to a general drop in positive affect. Although depression can be referred to as the "common cold" of psychology, it can still be a dangerous illness, especially due to the gain of suicidal ideation that could occur in some people with depression. Because of this, research is constantly seeking to understand the condition better. Since much genuinely experimental study on people with melancholy would constitute a breach of integrity, most research in this area focuses on creatures. The study conducted by Henningson et al. that's the subject of the paper utilized rats to study the effects of depression because of chronic pressure on cognitive performance. As it is not possible for rats to indicate in the exact same way as humans they're depressed, a version to mimic the development and progression was developed by researchers at the 1980s. Called the chronic mild stress model (CMS version), mice or rats are exposed to moderate stressors for numerous weeks (anywhere from one to seven) and also their ingestion of a specific sucrose solution is tracked. Decrease in sucrose consumption or taste is thought to reflect a decrease in sensitivity for benefits (Willner, 2005), a classic example of anhedonia, which is a frequent symp...