| HTL | hamster tumor line; hearing threshold level; high-L-leucine transport; histotechnologist; human T-ce... |
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| ITC | imidazolyl-thioguanine chemotherapy; Interagency Testing Committee; in the canal [hearing aid] |
| ITE | insufficient therapeutic effect; in the ear [hearing aid]; in-training examination; intrapulmonary i... |
| LFHL | low-frequency hearing loss |
| NAHSA | National Association for Hearing and Speech Action |
| Planck's theory | The theory that the radiation and absorption of energy take place in definite quantities called quanta (e) which vary in size and are defined by the equation e=hv in which h is planck's constant and v is the frequency of the radiation. (12 Dec 1998) |
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| Wollaston's theory | A theory that the semidecussation of the optic nerves at the chiasm is proved by the homonymous hemianopia seen in brain lesions. (05 Mar 2000) |
| polyphyletic theory | In haematology, the theory that blood cells are derived from several different stem cells, depending on the particular cell type. Synonym: polyphyletic theory. Origin: poly-+ G. Phyle, tribe (05 Mar 2000) |
| myoelastic theory | A theory stating that sound of the human voice is produced by vibrations of the vocal cords resulting from folding upward due to air pressure below, and subsequent movement downward due to elastic tension of cords. (05 Mar 2000) |
| myogenic theory | That cardiac movements are due mainly to stimuli originating in the heart muscle itself and that the heart does not act solely in response to nerve stimulation. (05 Mar 2000) |
| Haeckel's gastrea theory | That the two-layered gastrula is the ancestral form of all multicellular animals. Synonym: gastrea theory. (05 Mar 2000) |
| haematogenous theory of endometriosis | That endometrial tissue is carried, like metastases of a malignant tumour, through the blood stream. (05 Mar 2000) |
| preformation theory | Archaic theory that the embryo was fully formed in miniature within a gamete at the time of conception. See: homunculus. Synonym: emboitement, incasement theory. (05 Mar 2000) |
| probability theory | The branch of mathematics dealing with the purely logical properties of probability. Its theorems underlie most statistical methods. (12 Dec 1998) |
| Hering's theory of colour vision | That there are three opponent visual processes: blue-yellow, red-green, and white-black. (05 Mar 2000) |
| psychoanalytic theory | Conceptual system developed by freud and his followers in which unconscious motivations are considered to shape normal and abnormal personality development and behaviour. (12 Dec 1998) |
| psychological theory | Principles applied to the analysis and explanation of psychological or behavioural phenomena. (12 Dec 1998) |
| Semon-Hering theory | The theory that stimuli or irritants leave definite traces (engrams) on the protoplasm of the animal or plant, and when these stimuli are regularly repeated they induce a habit which persists after the stimuli cease; assuming that the germ cells share with the nerve cells in the possession of engrams, acquired habits may thus be transmitted to the descendants. Synonym: mnaemic theory, mnemism, Semon-Hering theory. (05 Mar 2000) |
| sensorimotor theory | In the developmental theory of Piaget, the postulation that during the first 18 months of life there occurs a transformation of action into thought; at first there is a gradual shift from inborn to acquired behaviour, then from body-centreed to object-centreed activity, ultimately permitting intentional behaviour and inventive thinking. (05 Mar 2000) |
| humoral theory | The ancient Greek theory of the four body humors (blood, yellow and black bile, and phlegm) that determined health and disease. The humors were associated with the four elements (air, fire, earth, and water), which in turn corresponded to a pair of the qualities (hot, cold, dry, and moist). A proper and evenly balanced mixture of the humors was characteristic of health of body and mind; an imperfect balance resulted in disease. Temperament of body or mind also was supposed to be determined, e.g., sanguine (blood), choleric (yellow bile), melancholic (black bile), or phlegmatic (phlegm). Synonym: fluidism, humoralism, humorism. (05 Mar 2000) |