Category: D

  • Decompensation

    The deterioration of existing defenses, leading to an exacerbation of pathological behavior. In psychology, ego or personality disorganization under excessive stress. A condition in which an organ such as the heart cannot cope with extra stress placed on it and so is unable to perform its function properly. Process of deterioration from a healthier to…

  • Declarative memory

    Long-term or “declarative” memory is characterized by active, conscious recall of all the facts, figures, and names we have ever learned. All of our experiences and conscious memory fall into this category. Although no one knows exactly where this enormous database is stored, the hippocampus is believed to be necessary to store new memories as…

  • Death instinct

    In Freudian theory, the unconscious drive toward death and self-destruction. It coexists with, and is in opposition to, the life instinct (Eros). In psychoanalytic theory, the unconscious will to destroy oneself.  

  • Daytrana

    Brand name for methylphenidate transdermal system.  

  • Day residue

    Any element of a dream that is clearly derived from some event of the previous day. The event acquires significance from unconscious connection with repressed conflicts and appears in the dream in a displaced and symbolic form. The day residue is often useful in deciphering meaning from the dream.  

  • Dalmane

    Brand name for the benzodiazepine sedative-hypnotic drug flurazepam.  

  • Da Costa’s syndrome

    Neurocirculatory asthenia (weakness); “soldier’s heart”; a functional disorder of the  irculatory system that is usually a part of an anxiety state or secondary to hyperventilation.  

  • Down-regulate

    To induce a reduction in the level of gene expression through genetic means.  

  • Docosahexaenoic acid (DHA)

    An omega-3 fatty acid that is a primary structural component of the brain. Along-chain polyunsaturated fatty acid (C22:6 ω3). Docosahexaenoic acid (DHA) is a long-chain (22 carbons) omega-3 polyunsaturated fatty acid found primarily in fish oil. DHA is highly unsaturated with six double bonds. The potential role of DHA in athletic performance is described in…

  • Dyspnea

    Dyspnea

    Difficult or labored breathing. Labored or difficult breathing, generally indicating an insufficient amount of oxygen in the blood. Shortness of breath or labored, difficult breathing; causes include strenuous activity, lung disorders, heart disease, and extreme stress or tension. The sensation of difficult, labored, or uncomfortable breathing. Dyspnea can vary widely in severity. It may be…