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Attention deficit hyperactivity disorder (ADHD) [1] is a neurodevelopmental disorder characterized by symptoms of inattention, hyperactivity, impulsivity and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and developmentally-inappropriate. [9] ADHD symptoms arise from executive dysfunction. [18]
Autism spectrum disorder is a disorder of the many parts of the brain. Structural changes are observed in the cortex, which controls higher functions, sensation, muscle movements, and memory. Structural defects are seen in the cerebellum too, which affect the motor and communication skills. [14]
Executive functioning is a theoretical construct representing a domain of cognitive processes that regulate, control, and manage other cognitive processes. Executive functioning is not a unitary concept; it is a broad description of the set of processes involved in certain areas of cognitive and behavioural control. [1]
No definitive cause of tic disorders has been declared, but for the most part, the cause lies within biological, chemical, or environmental factors. Studies have shown that abnormal neurotransmitters, such as dopamine and serotonin, which are active in chemical messages in the brain, can serve as a cause of tic disorders.
Although Weikard mainly described a single disorder of attention resembling the combined presentation of ADHD, Crichton postulates an additional attention disorder, described as a "morbid diminution of its power or energy", and further explores possible "corporeal" and "mental" causes for the disorder (including "irregularities in diet ...
Attention deficit hyperactivity disorder (ADHD) often involves motivational deficits, [82] [83] and the ADHD academic Russell Barkley has referred to the condition as a "motivational deficit disorder" in various publications and presentations.
ADHD medication tied to 19% lower death risk. An observational study conducted in Sweden, whose results appeared in JAMA in March 2024, further emphasized the positive impact of ADHD medication on ...
Damage to the frontal cortices of the brain can cause deficits in behavior that can severely impact an individual's ability to manage their daily life. [11] As such, the period after a traumatic brain injury such as a frontal lobe disorder can be marked by emotional dysregulation. This is also true of neurodegenerative diseases. [12]