Lability

lability

[lə′bil·əd·ē] (psychology) Very rapid fluctuations in intensity and modality of emotions; seen in the affective reaction or in certain organic brain disorders.

Lability

in physiology, functional mobility; the speed of flow of elementary cycles of excitation in nerve and muscle tissues.

The concept of lability was introduced by the Russian physiologist N. E. Vvedenskii (1886), who considered its measure to be the greatest frequency of tissue irritation possible without a change in rhythm. A tissue’s lability reflects the time necessary to restore the tissue’s work capacity after an excitation cycle. The greatest lability is found in the processes of the nerve cells, the axons, which are capable of reproducing as many as 500 or 1,000 impulses per sec. The central and peripheral sites of contact, or synapses, are less labile (for example, a motor nerve ending can transmit no more than 100–150 excitations per sec to a skeletal muscle).

Inhibition of the vital activities of tissues and cells (for example, by means of cold or narcotics) decreases lability, since the restorative processes are retarded thereby and the refractory period prolonged. The lability value is variable. Thus, the refractory period is shortened in the heart under the influence of frequent stimuli: its lability is increased. This phenomenon is the basis for what is called the assimilation of rhythm. The concept of lability is important to an understanding of the mechanisms of nervous activity, and of the operation of the neural centers and analyzers under both normal and pathological conditions.

In biology and medicine, the term “lability” refers to instability or variability, such as of the psyche, the physiological state, the pulse, or the body temperature.

REFERENCES

Vvedenskii, N. E. Poln. sobr. soch, vols. 1–2. Leningrad, 1951–52.
Ukhtomskii, A. A. Sobr. sock, vol. 2. Leningrad, 1951.
Golikov, N. V. Fiziologicheskaia labil’nost’ i ee izmeneniia priosnovnykh nervnykh protsessakh. Leningrad, 1950.

O. M. BENIUMOV

单词	lability
释义	lability la·bile L0002800 (lā′bīl′, -bəl)adj.1. Open to change; readily changeable or unstable: labile chemical compounds; tissues with labile cell populations.2. Fluctuating widely: labile hypertension; labile emotions.3. Decomposing readily: the labile component of organic matter. [Middle English labil, forgetful, wandering, from Old French labile, from Late Latin lābilis, apt to slip, from lābī, to slip.] la·bil′i·ty (-bĭl′ĭ-tē) n. lability the susceptibility to error or lapses of any kind, as a human failing. — labile, adj.See also: Strength and Weakness Translations Lability lability [lə′bil·əd·ē] (psychology) Very rapid fluctuations in intensity and modality of emotions; seen in the affective reaction or in certain organic brain disorders. Lability in physiology, functional mobility; the speed of flow of elementary cycles of excitation in nerve and muscle tissues. The concept of lability was introduced by the Russian physiologist N. E. Vvedenskii (1886), who considered its measure to be the greatest frequency of tissue irritation possible without a change in rhythm. A tissue’s lability reflects the time necessary to restore the tissue’s work capacity after an excitation cycle. The greatest lability is found in the processes of the nerve cells, the axons, which are capable of reproducing as many as 500 or 1,000 impulses per sec. The central and peripheral sites of contact, or synapses, are less labile (for example, a motor nerve ending can transmit no more than 100–150 excitations per sec to a skeletal muscle). Inhibition of the vital activities of tissues and cells (for example, by means of cold or narcotics) decreases lability, since the restorative processes are retarded thereby and the refractory period prolonged. The lability value is variable. Thus, the refractory period is shortened in the heart under the influence of frequent stimuli: its lability is increased. This phenomenon is the basis for what is called the assimilation of rhythm. The concept of lability is important to an understanding of the mechanisms of nervous activity, and of the operation of the neural centers and analyzers under both normal and pathological conditions. In biology and medicine, the term “lability” refers to instability or variability, such as of the psyche, the physiological state, the pulse, or the body temperature. REFERENCES Vvedenskii, N. E. Poln. sobr. soch, vols. 1–2. Leningrad, 1951–52. Ukhtomskii, A. A. Sobr. sock, vol. 2. Leningrad, 1951. Golikov, N. V. Fiziologicheskaia labil’nost’ i ee izmeneniia priosnovnykh nervnykh protsessakh. Leningrad, 1950. O. M. BENIUMOV lability lability [lah-bil´ĭ-te] 1. the quality of being labile.2. in psychiatry, emotional instability; rapidly changing emotions. la·bil·i·ty (lă-bil'i-tē), The state of being labile. lability Neurology Neurologic instability, as in an evolving CVA/TIA or spinal cord injury. See Cerebrovascular accident, Spinal cord injury, Transient ischemic attack. la·bil·i·ty (lă-bil'i-tē) The state of being labile. ThesaurusSeelabile
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lability

la·bile

lability

Lability

lability

Lability

REFERENCES

lability

lability

la·bil·i·ty

lability

la·bil·i·ty