Reactive inhibition

Key takeaways

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

Reference excerpt

Reactive inhibition is a phrase coined by Clark L. Hull in his 1943 book titled Principles of Behavior. He defined it as:

Whenever any reaction is evoked in an organism there is left a condition or state which acts as a primary negative motivation in that it has an innate capacity to produce a cessation of the activity which produced the state. Reactive inhibition is typically studied in the context of drive reduction. Hull likens it to fatigue through which humans become tired over time and thus less accurate and precise within a given task. There is significant debate whether the process of reactive inhibition is due to fatigue or some other process. Nevertheless, it is a factor researchers need to consider in analyses of sustained performance due to its possible role in the results and analysis of research. Hull goes on to further explain the decay of performance through the use of a decay formula which can estimate the rate of performance deterioration. Hull explains:

I dissipates exponentially with time t:With the passage of time since its formation IR spontaneously dissipates approximately as a simple decay function of the time t elapsed, i.e.,

I R ′ = I R x 10 − a t {\displaystyle I'_{R}=I_{R}x10^{-at}} (Hull, 1951, p. 74).Hull's decay formula is somewhat awkward and might give rise to confusion. For example, I'R does not refer to the derivative of IR. A more convenient way of writing the formula would be as follows:

I ( t ) = I ( 0 ) e − b t {\displaystyle I(t)=I(0)e^{-bt}}

with b = a ln ⁡ ( 10 ) {\displaystyle b=a\ln(10)} . I ( 0 ) {\displaystyle I(0)} is the inhibition at the beginning of the time interval [0,t]. Note that if one takes the natural logarithm of both sides one obtains:

Y ( t ) = Y ( 0 ) − b t {\displaystyle Y(t)=Y(0)-bt}

where Y ( t ) = ln ⁡ I ( t ) {\displaystyle Y(t)=\ln I(t)} and Y ( 0 ) = ln ⁡ I ( 0 ) {\displaystyle Y(0)=\ln I(0)} . The last formula is used in inhibition theory. Reactive inhibition is distinct from proactive inhibition. Reactive inhibition occurs after an initial response has been activated and set to be carried out. In contrast, proactive inhibition determines whether or not the response process is activated in the future and occurs before initial activation. Reactive inhibition is considered to be a bottom-up processing process and associated with "lower level mechanisms of inhibition", whereas proactive inhibition is considered more top-down processing and dealing with "higher level mechanisms".

Applications Reactive inhibition may be important in everyday life during a process in which a decline in performance can be detrimental such as driving a car during rush hour. For example, Kathaus, Washcer, & Getzmann (2018) found that older adults who showed a tendency towards reactive inhibition, determined through electroencephalography measures, showed higher "driving lane variability" and more impairment. Although older adults matched younger adults in their lane keeping abilities, they were unable to change lanes as effectively when they relied on reactive inhibition. Another study also revolving around younger vs older adults in the realm of inhibition found that older adults had decreased reactive inhibition but sustain proactive inhibition overall. By using a smart phone app, participants played a game in which two apples were falling from either side of the tree. They were to tap either apple but not press one of the apples if that apple turned brown or "rotten". This is similar to a Stop Signal Task as described below. Some of these trials were primed for a person to expect a change and others not. What was found was a decreased ability in older adults to inhibit an action when they were not primed thus indicating a deficit in reactive inhibition. Researchers have also studied reactive inhibition within the context of ADHD. It is commonly accepted that decreased inhibition abilities are a prominent aspect of the symptoms associated with ADHD. Within the context of the Stop Signal Task studies point to an inability to switch attention the signal switches from a go signal, to stop, which can be compared to environmental changes in the world. Further, it is proven that reactive inhibition in particular is affected in individuals with ADHD and related ADHD symptoms, and may not even have an impact on proactive inhibition at all. The ability to inhibit can impact children's learning abilities and is a lack of reactive inhibition is present in many learning disorders.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Reactive inhibition

Start with the simplest possible case. Write down what Reactive inhibition 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 Reactive inhibition 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 Reactive inhibition 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 Reactive inhibition

In research: Reactive inhibition 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 Reactive inhibition 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: Reactive inhibition is common in secondary-school and first-year university syllabi. It links to neighbouring topics Perception, so understanding it makes those chapters shorter.
In everyday life: Look for Reactive inhibition 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.

How to study Reactive inhibition in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Reactive inhibition 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 Reactive inhibition out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Reactive inhibition in simple terms?

Reactive inhibition is a phrase coined by Clark L. Hull in his 1943 book titled Principles of Behavior.

Why does Reactive inhibition 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 Reactive inhibition?

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 Reactive inhibition.