science

Threshold of pain

Threshold of pain is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Threshold of pain rather than just read about it. In short: The threshold of pain or pain threshold is the point along a curve of increasing perception of a stimulus at which pain begins to be felt. It is an entirely subjective phenomenon.

Key takeaways

Threshold of pain belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Threshold of pain to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Threshold of pain from memory before moving on to harder problems.

Reference excerpt

The threshold of pain or pain threshold is the point along a curve of increasing perception of a stimulus at which pain begins to be felt. It is an entirely subjective phenomenon. A distinction must be maintained between the stimulus (an external thing that can be directly measured, such as with a thermometer) and the person's or animal's resulting pain perception (an internal, subjective thing that can sometimes be measured indirectly, such as with a visual analog scale). Although an IASP document defines "pain threshold" as "the minimum intensity of a stimulus that is perceived as painful", it then goes on to say (contradictorily in letter although not in spirit) that:

Traditionally the threshold has often been defined, as we defined it formerly, as the least stimulus intensity at which a subject perceives pain. Properly defined, the threshold is really the experience of the patient, whereas the intensity measured is an external event. It has been common usage for most pain research workers to define the threshold in terms of the stimulus, and that should be avoided ... The stimulus is not pain (q.v.) and cannot be a measure of pain.

Although the phrasing may not convey it perfectly, the distinction clearly meant is the aforementioned one between the stimulus and the perception of it. The intensity at which a stimulus (e.g., heat, pressure) begins to evoke pain is thus called by a separate term, threshold intensity. So, if a hotplate on a person's skin begins to hurt at 42 °C (107 °F), that is the pain threshold temperature for that bit of skin at that time. It is not the pain threshold (which is internal/subjective) but the temperature at which the pain threshold was crossed (which is external/objective). The intensity at which a stimulus begins to evoke pain varies from individual to individual and for a given individual over time.

Heat The temperature at which heat becomes painful for a recipient is called the heat pain threshold for that person at that time. One study showed that morning-oriented people have higher pain threshold for heat as compared to evening-oriented individuals.

Hearing The pressure at which sound becomes painful for a listener is the pain threshold pressure for that person at that time. The threshold pressure for sound varies with frequency and can be age-dependent. People who have been exposed to more noise/music usually have a higher threshold pressure. Threshold shift can also cause threshold pressure to vary. Prolonged exposure to sound at levels evoking pain can cause physical damage, potentially leading to hearing impairment and tinnitus. The volume in acoustics refers to loudness. It is a common term for the amplitude of sound or the sound pressure level. Different values for pain threshold pressure level and pain threshold pressure are found in the literature:

See also Absolute threshold of hearing Dolorimeter – an instrument used to measure pain threshold Exposure action value Limen – threshold of perception Phon Sone Weber–Fechner law, regarding the difference between stimulus and sensation Weighting curve and A-weighting regarding dB(A)

References

Illustrations

Worked examples

Example 1 — a first encounter with Threshold of pain

Start with the simplest possible case. Write down what Threshold of pain claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Threshold of pain before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Threshold of pain ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Threshold of pain

In research: Threshold of pain appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Threshold of pain in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Threshold of pain is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hearing, Pain, so understanding it makes those chapters shorter.
In everyday life: Look for Threshold of pain outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Threshold of pain in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Threshold of pain means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Threshold of pain out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Threshold of pain in simple terms?

The threshold of pain or pain threshold is the point along a curve of increasing perception of a stimulus at which pain begins to be felt. It is an entirely subjective phenomenon.

Why does Threshold of pain matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Threshold of pain?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Threshold of pain.