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Absent-mindedness is where a person shows inattentive or forgetful behaviour. It can have three different causes:
Absent-mindedness is a mental condition in which the subject experiences low levels of attention and frequent distraction. Absent-mindedness is not a diagnosed condition but rather a symptom of boredom and sleepiness which people experience in their daily lives. When suffering from absent-mindedness, people tend to show signs of memory lapse and weak recollection of recently occurring events. This can usually be a result of a variety of other conditions often diagnosed by clinicians such as ADD and depression. In addition to absent-mindedness leading to an array of consequences affecting daily life, it can have as more severe, long-term problems.
Absent-mindedness seemingly consists of lapses of concentration or "zoning out". This can result in lapses of short or long term memory, depending on when the person in question was in a state of absent-mindedness. Absent-mindedness also relates directly to lapses in attention. Schachter and Dodsen say, that in the context of memory, “absent-mindedness entails inattentive or shallow processing that contributes to weak memories of ongoing events or forgetting to do things in the future”. This is common among teenagers and seniors.
Though absent-mindedness is a frequent occurrence, there has been little progress made on what the direct causes of absent-mindedness are. However, it tends to co-occur with ill health, preoccupation, and distraction.
Lapses of attention are clearly a part of everyone’s life. Some are merely inconvenient, such as missing a familiar turn-off on the highway, while some are extremely serious, such as failures of attention that cause accidents, injury, or loss of life. Beyond the obvious costs of accidents arising from lapses in attention there are: lost time; efficiency; personal productivity; and quality of life. These can also occur in the lapse and recapture of awareness and attention to everyday tasks. Individuals for whom intervals between lapses are very short are typically viewed as impaired. Given the prevalence of attentional failures in everyday life, and the ubiquitous and sometimes disastrous consequences of such failures, it is rather surprising that relatively little work has been done to directly measure individual differences in everyday errors arising from propensities for failures of attention. Absent-mindedness can also lead to bad grades at school, boredom, and depression 
The absent-minded professor is a stock character often depicted in fictional works, usually as a talented academic whose focus on academic matters leads them to ignore or forget their surroundings. This stereotypical view can be traced back as far as the philosopher Thales, who it is said "walked at night with his eyes focused on the heavens and, as a result, fell down a well". One classic example of this is in the Disney film The Absent-Minded Professor made in 1963 and based on the short story A Situation of Gravity, by Samuel W. Taylor. Two examples of this character portrayed in more modern media include doctor Emmett Brown from Back to the Future and Professor Farnsworth of Futurama.
In literature, "The Absent-Minded Beggar" is a poem by Rudyard Kipling, written in 1899, and was directed at the absent–mindedness of the population of Great Britain in ignoring the plight of their troops in the Boer War. The poem illustrated the fact that soldiers who could not return to their previous jobs needed support, and the need to raise money to support the fighting troops. The poem was also set to music by Gilbert & Sullivan and a campaign raised to support the British troops, especially on their departure and return, and the sick and wounded. Franz Kafka also wrote "Absent-minded Window-gazing", one of his short-story titles from Betrachtung.
Other characters include:
Absent-mindedness can be avoided or fixed in several ways. Although it can be accomplished through medical procedures, it can also be accomplished through psychological treatments. Examples include: altering work schedules to make them shorter, having frequent rest periods and utilizing a drowsy-operator warning device.
Absent-mindedness and its related topics are often measured in scales developed in studies to survey boredom and attention levels. For instance, the Attention-Related Cognitive Errors Scale (ARCES) reflects errors in performance that result from attention lapses. Another scale, called the Mindful Attention Awareness Scale (MAAS) measures the ability to maintain a reasonable level of attention in everyday life. The Boredom Proneness Scale (BPS) measures the level of boredom in relation to the attention level of the subject.
Absent-mindedness can lead to automatic behaviors, or automatisms. Additionally, absent-minded actions can involve behavioral mistakes. A phenomenon called Attention-Lapse Induced Alienation occurs when a person makes a mistake while absent-mindedly performing a task. The person then attributes the mistake to his or her hand rather than their self, because they were not paying attention.
In Theaetetus (174 A) Plato had Socrates relate a story that Thales was so intent upon watching the stars that he failed to watch where he was walking, and fell into a well
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