science

Monkey Drug Trials

Monkey Drug Trials 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 Monkey Drug Trials rather than just read about it. In short: The Monkey Drug Trials of 1969 were a series of controversial animal testing experiments that were conducted on primates to study the effects of various psychoactive substances. The trials shed light on the profound effects of drug addiction and withdrawal in primates, pioneering critical insights into human substance abuse.

Key takeaways

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

Reference excerpt

The Monkey Drug Trials of 1969 were a series of controversial animal testing experiments that were conducted on primates to study the effects of various psychoactive substances. The trials shed light on the profound effects of drug addiction and withdrawal in primates, pioneering critical insights into human substance abuse.

Background The Monkey Drug Trials experiment was influenced by preceding research discussing related topics. Six notable research publications may be highlighted: “Factors regulating oral consumption of an opioid (etonitazene) by morphine-addicted rats”; “Experimental morphine addiction: Method for automatic intravenous injections in unrestrained rats.”; ”Morphine self-administration, food-reinforced, and avoidance behaviors in rhesus monkeys''; “Psychopharmacological elements of drug dependence”; “Drug addiction. I. Addiction by escape training”; “Morphine addiction in rats”.

Experiments The study “Self-Administration of Psychoactive Substances by the Monkey” was conducted by G. Deneau, T. Yanagita and M.H. Seever at the department of pharmacology at the University of Michigan. The monkey drug trials consisted of self-injection of intravenous drugs in monkeys, in which the primates were trained to operate the self-administration of cocaine, morphine, amphetamines, codeine, caffeine, mescaline, pentobarbital, ethanol, by using a lever in their cage. Their responses to the drugs over time were carefully analyzed to assess whether monkeys, after initial exposure to it, will show a voluntary intake of it, indicating psychological dependencies. The results suggested that some drugs elicited signs of dependency while others did not. They were compared with human dependency problems aiming to find an explanation of physiological and psychological drug dependence in humans. Those trials had some drastic side effects like tremors, hallucinations, convulsions, sudden death and disorientation. Several other experiments that were highly criticised because of moral issues led to the development of guidelines for guidelines for Ethical Conduct in the Care and Use of Animals provided by the American Psychological Association.

Procedure Monkeys selected as experiment subjects were kept in specially-built cubicles. Inside the booths, monkeys were restrained by a harness attached to a restraining arm mounted on the wall. Upon acclimation of the monkey to the new environment, the harness was adjusted to fit the size of the animal. A silicone catheter was inserted into the monkey’s jugular vein under anesthesia and fixed in place. The other end of the catheter was attached to a tube running through the harness to an injector. After the monkey recovered from the catheter installation, two switches were placed inside the cubicle. Pressing one of the switches activated the injector and saline was injected into the vein of the monkey. Upon pressing the other switch, saline was transported back from the injector to the container. After the monkey learned to operate the self-administration mechanism, saline was switched to a drug solution. Drug injections could be administered by the monkey or a timer. If the drug had rewarding effects on the monkey, it increased the self-administration rate as pressing the switch would be associated with a pleasant experience. If the experience was perceived negatively, the monkey avoided pressing the switch. In the event of the monkey not initiating drug injections, the solution was administered automatically at regular intervals to test if upon further exposure, the monkey would begin to press the switch on its own, signaling psychological dependence on the drug.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Monkey Drug Trials

Start with the simplest possible case. Write down what Monkey Drug Trials 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 Monkey Drug Trials 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 Monkey Drug Trials 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 Monkey Drug Trials

In research: Monkey Drug Trials 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 Monkey Drug Trials 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: Monkey Drug Trials is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal rights, Animal testing in the United States, Animal testing on monkeys, so understanding it makes those chapters shorter.
In everyday life: Look for Monkey Drug Trials 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 Monkey Drug Trials in 20 minutes

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

Frequently asked questions

What is Monkey Drug Trials in simple terms?

Why does Monkey Drug Trials 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 Monkey Drug Trials?

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 Monkey Drug Trials.