# sensitivity

## Definitions

### General Science

• noun the ability to record very small changes
• noun a minimum power of a received signal that is necessary for a receiver to distinguish the signal

### Aviation

• noun the quality or state of being able to register very small differences or changes in conditions

### Electronics

• The ability to detect or otherwise perceive a given phenomenon, state, condition, or level. Also, the degree of such sensitivity.
• The magnitude of the response of a component, circuit, device, instrument, piece of equipment, system, or material, to a given stimulus, level, or other input signal. For instance, the ohms per volt rating of a voltmeter, or the magnitude of the deflection of an indicating needle in response to a given change in a detected variable.
• The minimum input signal that produces a given output signal. For example, the minimum input signal level that a specific radio receiver needs to produce a stated output level.
• The proportion of the audio frequency electrical power input to a loudspeaker which is converted into acoustic energy. Efficiency may be measured, for instance, by driving a loudspeaker with a power input of 1 watt, and measuring its output, in decibels, at a distance of 1 meter. Also called speaker efficiency, loudspeaker efficiency, or efficiency (3).
• synonymspeaker efficiency

### Health Economics

• (written as Sensitivity)
The proportion of individuals with a condition who are correctly identified as such by a test. It is calculated thus: Sensitivity = TP/ (TP+FN), where TP is the number of true positives and FN is the number of false negatives. The terms 'positive' and 'negative' are used to refer to the presence or absence of the condition of interest. In the figure, sensitivity = a /( a + c). A test that has low sensitivity will not detect all or even most of the people with the condition - the test is not sensitive enough.

### Media Studies

• noun the ability of a radio or other receiver to respond to transmitted signals
• noun the capacity to respond to radiation, especially light, as of photographic paper

### Medical

• noun the fact of being able to detect and respond to an outside stimulus
• noun the rate of positive responses in a test from persons with a specific disease. A high rate of sensitivity means a low rate of people being incorrectly classed as negative.
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