Definition Of

Attention-deficit hyperactivity disorder or ADHD

A considerably more common childhood disorder is attention-deficit hyperactivity disorder or ADHD, a disorder marked by inattention, impulsiveness, a low tolerance for frustration, and generally a great deal of inappropriate activity. Although all children show such behavior some of the time, it is so common in children diagnosed with ADHD that it interferes with their everyday functioning.

 ADHD is surprisingly widespread, with estimates ranging between 3 and 5 percent of the school-age population – or some 3.5 million children under the age of 18 in the United States. Children diagnosed with the disorder are often exhausting to parents and teachers, and even their peers find them difficult to deal with.

Share it:

More from this Section

  • Social psychology
    Social psychology is the study of how people’s thoughts, feeling and actions are affected by others.
  • Schedules of reinforcement
    Different patterns of frequency and timing of reinforcement following desired behavior, is called schedules of reinforcement.
  • Weber’s law
    Weber’s law states a basic law of psychophysics stating that a just noticeable difference is in constant proportion to the intensity of an initial
  • Retroactive interference
    Retroactive interference refers to difficulty in the recall of information because of later exposure to different material. If, for example, you
  • Inhibitory messages
    Inhibitory messages, in contrast, do just the opposite; they provide chemical information that prevents or decreases the likelihood that the
  • Manifest content of dreams
    The apparent story line of dreams, which Freud called the manifest content of dreams.
  • Prototypes
    Prototypes are typical, highly representative examples of a concept that correspond to our mental image or best example of the concept.