The effects of marijuana have shown unclear results regarding an individual’s cognitive ability to recall information regardless of the state they were in while encoding and/ or recalling. In a study, a wide array of subjects with varying levels of THC exposure were given a dosage of this compound and asked to perform tasks relating to memory function. The final results did not produce sufficient evidence to make a strong argument regarding cannabis and state dependent memory. It has been hypothesized throughout the years that intoxicated people do not remember what they did while they were drunk because they were in a state of euphoria. Whereas in day to day life the average person is not quite as happy. It is not until they become intoxicated again and reach that higher mood that they can begin to piece together what they did a few nights before. State-dependent memory influenced by mood has been the subject of some controversy within the psychological field. Though research seemed to show evidence for the existence of mood-dependence in memory, this came into question later on when researchers suggested the results were actually the result of mood congruent memory, a phenomenon in which an individual recalls more information associated with their condition. For example, a person who is asked to learn a list of words while they have a cold might remember more words associated with their illness such as "tissue" or "congestion" when later asked to recall the words learned. Researchers have since been conducting experiments to unearth the truth about mood-dependent memory, though it remains difficult to completely eliminate unreliability from such studies. Some studies have investigated the existence of mood-dependent memory, especially in individuals with bipolar disorder who generally vacillate over time between mood extremes, specifically depression and mania. In 1977, it was found that individuals with bipolar disorder performed better on a verbal association test when they were in a similar mood state to their state when the verbal associations were learned. A more recent study in 2011 similarly studied a group of individual with bipolar disorder and found evidence for mood-dependent memory on a visual task (recognition of inkblots). It was observed that subjects had better recall for these inkblots when they were in the same mood state they had been in when they first saw these inkblots. However, researchers did "not" find a similar effect for verbal tasks. Because the two studies do not agree on the effects of mood in regard to verbal recall tasks, further research is needed to clarify the existence of mood-dependent memory on both verbal and visual recall tasks as well as to investigate mood-dependent memory in those suffering from other mood disorders or individuals "without" mood disorders of any kind.