AP Psych Zero: What Does a Drug Actually Change?
It's seven in the morning, your head is pounding, and you take something for it. By half past seven the headache is gone. Nothing in that tablet knows where your head hurts.
0:00 / 7:30
AP Psych Zero: What Does a Drug Actually Change?
This episode closes Unit 1's third topic. The two lessons before it covered the neuron's structure and the transmission process; this one covers the topic's third objective, how psychoactive drugs affect behavior and mental processes. The short version is that a drug does not invent a message. It changes one the nervous system was already sending, and most exam items ask you to say which change it made.
What you will learn
- The three mechanisms the framework names — agonists, antagonists, and reuptake inhibitors — and where each one acts in the transmission process.
- The four classes of drug effect, with the example the framework gives for each: stimulants, depressants, hallucinogens, and opioids.
- Why a depressant can feel stimulating, and why the exam still calls it a depressant.
- Tolerance, addiction, and withdrawal, and why tolerance on its own is not addiction.
- Three questions that sort almost any drug item you meet.
Learning map
The framework describes three ways a psychoactive drug can influence neurotransmitter function during neural communication. 1
| Mechanism | Where it acts | What happens to the message |
|---|---|---|
| Agonist | The receptor on the receiving cell | It switches the receptor on, encouraging neural firing |
| Antagonist | The receptor on the receiving cell, without switching it on | It occupies the receptor and keeps the real transmitter out, discouraging firing |
| Reuptake inhibitor | The cleanup, in the cell that sent the message | The transmitter stays in the gap and keeps hitting the next cell, so the message runs longer |
The four classes are grouped by the effect you would notice, not by the mechanism that produces it. 1
| Class | The framework's example | Typical effect |
|---|---|---|
| Stimulant | Caffeine, cocaine | Increased neural activity |
| Depressant | Alcohol | Decreased neural activity |
| Hallucinogen | Marijuana | Distortions in perception and/or cognition |
| Opioid | Heroin | Pain relief |
Two links make the lists easier to hold. Alcohol works by strengthening GABA, the main inhibitory transmitter, and weakening glutamate, the main excitatory one, which is why its felt effect can look like the opposite of its class. Opioids act at the same receptors the body's own endorphins use, which is why the pain quietens.
Repeated use adds the framework's third point. Tolerance means the same dose no longer produces the same effect, so a person takes more to reach what the first dose gave. Addiction is listed separately, and it can bring withdrawal symptoms, which the framework calls significant, once the drug is no longer consumed. 1 Tolerance and addiction are joined by "and/or" in the framework's wording because one can arrive without the other.
Study check
Answer these before replaying the final minutes:
- Name the three mechanisms for how a psychoactive drug can act in the transmission process, and say what each does to neural firing.
- Which class typically increases neural activity and which typically decreases it, and which drug does the framework give as the example of each?
- Which class does the framework file marijuana under, and what is a hallucinogen's typical effect?
- What is the difference between tolerance and withdrawal?
- An item says a drug blocks the reuptake of serotonin. Is the drug an agonist, an antagonist, or a reuptake inhibitor, and does the serotonin message get stronger or weaker?
The three questions to carry out of this episode: where does the drug act, which way does the behavior move, and what has repeated use done.
Scope and sources
The framework's third objective runs across three essential-knowledge statements. Drugs can influence neurotransmitter function throughout the neural communication process, with agonists encouraging firing, antagonists discouraging it, and reuptake inhibitors blocking the reabsorption of neurotransmitters back into the cell. Drugs have psychological and physiological effects, which is where the four classes and their examples come from. And drug use can lead to tolerance and/or addiction, with addiction able to create significant withdrawal symptoms once the drug is no longer consumed. 1
Two notes on scope. The framework files marijuana with the hallucinogens, so that is the label to use on the exam even though other systems of classification treat it differently. And this objective has no exclusion statement of its own; the topic's exclusions belong to the neuron material that came before, which is why the eight neurotransmitters and five hormones are a closed list while the drug examples here are the framework's illustrations of each class rather than that kind of list. The AP Psychology course page is the course's public entry point. 2
This closes Topic 1.3. Unit 1 continues with the brain, which the framework sets out as its own topic.
This episode is a study aid. Use your teacher's current materials and the current College Board framework for course-specific assignments and exam details.
References
- 1AP Psychology Course and Exam Description — College Board
apcentral.collegeboard.org
- 2AP Psychology Course — AP Central, College Board
apcentral.collegeboard.org
This story was produced automatically by a channel. One sentence is all it takes for Neodrop to keep producing for you.