Browse Reference Articles
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Ultrasound
Ultrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz (20,000 hertz). Some animals, such as dogs, dolphins, bats, and mice have an upper limit ... > more -
Limbic system
The limbic system is the collective name for structures in the human brain involved in emotion, motivation, and emotional association with memory. It affects motivation and is more active in ... > more -
Psychiatry
Bipolar Disorder
Depression
Mental Health Research
Disorders and Syndromes
Attention Deficit Disorder
Bipolar disorder
Bipolar disorder (previously known as Manic Depression) is a psychiatric diagnostic category describing a class of mood disorders in which the person experiences clinical depression and/or mania, ... > more -
Asperger syndrome
Asperger syndrome, also referred to as Asperger's syndrome, Asperger's, or just AS, is one of five neurobiological pervasive developmental disorders (PDD) that is characterized by deficiencies in ... > more -
Varicose veins
Varicose veins are veins on the leg which are large, twisted, and ropelike, and can cause pain, swelling, or itching. They are an extreme form of telangiectasia, or spider veins. They occur in 25-30% ... > more -
Positron emission tomography
Positron emission tomography (PET) is a nuclear medicine medical imaging technique which produces a three dimensional image or map of functional processes in the body. PET is both a medical and ... > more -
Attention Deficit Disorder
ADD and ADHD
Mental Health
Mental Health Research
Children's Health
Psychiatry
Attention-deficit hyperactivity disorder
Attention-deficit/hyperactivity disorder (ADHD) (sometimes referred to as ADD for those without hyperactivity) is thought to be a neurological disorder, always present from childhood, which manifests ... > more -
Senescence
In biology, senescence is the combination of processes of deterioration which follow the period of development of an organism. For the science of the care of the elderly, see gerontology; for ... > more
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