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Executive function
Definition
The term executive function describes a set of cognitive abilities that control and regulate other abilities and behaviors. Executive functions are necessary for goal-directed behavior. They include the ability to initiate and stop actions, to monitor and change behavior as needed, and to plan future behavior when faced with novel tasks and situations. Executive functions allow us to anticipate outcomes and adapt to changing situations. The ability to form concepts and think abstractly are often considered components of executive function.
Description
As the name implies, executive functions are high-level abilities that influence more basic abilities like attention, memory and motor skills. For this reason, they can be difficult to assess directly. Many of the tests used to measure other abilities, particularly those that look at more complex aspects of these abilities, can be used to evaluate executive functions. For example, a person with executive function deficits may perform well on tests of basic attention, such as those that simply ask the individual to look at a computer screen and respond when a particular shape appears, but have trouble with tasks that require divided or alternating attention, such as giving a different response depending on the stimulus presented. Verbal fluency tests that ask people to say a number of words in a certain period of time can also reveal problems
Executive functions are important for successful adaptation and performance in real-life situations. They allow people to initiate and complete tasks and to persevere in the face of challenges. Because the environment can be unpredictable, executive functions are vital to human ability to recognize the significance of unexpected situations and to make alternative plans quickly when unusual events arise and interfere with normal routines. In this way, executive function contributes to success in work and school and allows people to manage the stresses of daily life. Executive functions also enable people to inhibit inappropriate behaviors. People with poor executive functions often have problems interacting with other people since they may say or do things that are bizarre or offensive to others. Most people experience impulses to do or say things that could get them in trouble, such as making a sexually explicit comment to a stranger, commenting negatively on someone's appearance, or insulting an authority figure like a boss or police officer; but most people have no trouble suppressing these urges. When executive functions are impaired, however, these urges may not be suppressed. Executive functions are thus an important component of the ability to fit in socially.
Executive function deficits are associated with a number of psychiatric and developmental disorders, including obsessive-compulsive disorder, Tourette's syndrome, depression, schizophrenia, attention-deficit/hyperactivity disorder, and autism. Executive function deficits also appear to play a role in antisocial behavior. Chronic heavy users of drugs and alcohol show impairments on tests of executive function. Some of these deficits appear to result from heavy substance use, but there is also evidence suggesting that problems with executive functions may contribute to the development of substance use disorders.
Because executive functions govern so many lower-level abilities, there is some controversy about their physiological basis. Nevertheless, most people who study these abilities agree that the frontal lobes of the brain play a major role in executive function. The frontal lobes are the large portions of the brain cortex that lie near the front of the brain. The cortex is the site in the brain where lower level processes like sensation and perception are processed and integrated into thoughts, memories and abilities, and actions are planned and initiated. People with frontal lobe injuries have difficulty with the higher
See also Autism; Dementia; Schizophrenia; Tic disorders
