... has shown this effect with a range of other drugs including marijuana. Clark et al (1987): Victims' inabilities to recall details of a violent crime may be due at least partly to the fact that recall occurs in a less emotionally aroused state. McCormick. & Mayer (1991): We are more likely to remember happy events when we are feeling happy rather than sad. There is some evidence that memory is better for material that is congruent with a person's current mood. For example, depressed people tend to recall more unhappy memories than non-depressed people. Clark and Teasdale (1982) investigated people whose depression fluctuated through the 24 hour cycle, and found that they were consistently less likely to recall happy memories during their sad phases than during their relatively neutral phases. Studies have also been conducted on non-depressed individuals by manipulating their mood, e.g. by asking them to think about ...

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