Week 15 · Chapter

Chapter 15 — Psychological Disorders & Treatment

Introduction to Psychology Free sample edition

The module's primary reading · ~40–50 minutes · Objective 8 (apply psychological science to social behavior, stress and health, and the classification and evidence-based treatment of psychological disorders, using accurate and non-stigmatizing language), Objective 7 (describe cognitive, social, and emotional development across the lifespan and compare the major families of personality theory and their assessment), Objective 2 (evaluate psychological research methods and ethics, distinguishing correlation from causation, random sampling from random assignment, and identifying sources of bias), Objective 1 (explain what makes psychology a science and compare its major theoretical perspectives (biological, psychodynamic, behavioral, cognitive, humanistic, sociocultural)) · Read it first this week; the lecture, the slides, the tutorial, the quiz, and the Analysis Workshop all build on it.

In plain language

Everyone has hard weeks, and some people have struggles that last for months and get in the way of daily life. A psychological disorder is a lasting pattern of thoughts, feelings, or behaviors that causes real suffering or trouble in daily life and is unusual for the person's culture. This week you will learn how psychologists decide when a struggle may be a disorder, how they name conditions without labeling people, and why some people develop a disorder while others in the same situation do not. You will also meet the main kinds of treatment and see how researchers test whether a treatment works. Finally, you will look at stigma, which means the negative beliefs and unfair treatment that keep many people from getting help.

Why you already care about this

Picture one ordinary week in three lives. A runner is out before sunrise six days a week, in rain or cold, and loves every mile. A student cries most evenings in the weeks after a grandparent dies and misses two days of class. A commuter has had sudden waves of pounding-heart fear on the bus for months. Now the commuter walks an hour to work to avoid the bus and has started missing shifts.

Which of these people, if any, has a psychological disorder? Most people answer fast, and most answers lean on a feeling rather than a rule. This chapter gives you the rule psychologists use, and it shows you why the rule always needs context. It also shows you what helps, because the most important fact about psychological disorders is that they are treatable health conditions.

You know a lot of this territory already. You have heard "I'm so OCD about my desk" and "the weather is so bipolar today." Those phrases borrow real conditions to describe ordinary moods. By the end of the week you will hear them differently.

By the end of this chapter you will be able to:

use the three D's, in context, to explain why a pattern may or may not be a psychological disorder;
describe the DSM-5-TR as a classification of conditions, not of people, and rewrite a sentence in person-first language;
describe six categories of disorders accurately and without stigma;
explain the diathesis–stress model and why a disorder is not a weakness;
match five therapy families to their core ideas and explain how an experiment shows whether a therapy works;
explain how stigma keeps people from care, and apply the six perspectives to one pattern and its treatment.

Carry this sentence with you: a disorder is something a person has — not who they are.

Where we are

Already covered: Week 1 gave you six perspectives and the biopsychosocial model. Week 2 taught you what an experiment can claim. Week 6 explained how fear is learned and unlearned. Week 12 introduced the psychodynamic and humanistic families of personality theory. Week 14 showed how stress reaches the body.
This week: how psychologists define and classify psychological disorders, why disorders develop, which treatments the evidence supports, and how stigma keeps people from care.
How they connect: Week 14's stress becomes half of the diathesis–stress model. Week 6's learning and Week 12's personality families become therapies, and Week 2's experiment shows whether a therapy works.
Where we're going next: this is the last module of new material. Next comes finals week, with no new lessons; the cumulative final asks you to use every lens from the course at once.

Four earlier ideas matter most this week. In Week 1 you met the biopsychosocial model: the view that biological, psychological, and social influences act together on behavior and health. In Week 2 you learned that in an experiment the researcher manipulates an independent variable (IV), measures a dependent variable (DV), and uses random assignment so a difference between groups can be traced to the manipulation. In Week 6 you met negative reinforcement: removing something unpleasant after a behavior, which makes the behavior more likely. And in Week 14 you learned that stress is the response to an event a person appraises as threatening or challenging. All four come back in the next six sections.

1. Draw the line: the three D's, in context

Go back to the runner. Training before sunrise six days a week is unusual. Most people do not do it. Is it a disorder? Almost everyone says no, and the reason is worth putting into words: the runner is not suffering, and running is not getting in the way of anything.

That instinct is the start of the rule psychologists use. A psychological disorder is a pattern of thoughts, feelings, or behaviors that causes significant distress or dysfunction and departs from the norms of the person's culture, judged in context. It is a health condition a person has, not a label for who the person is.

The rule has three parts, known as the three D's. You weigh them together, never one at a time.

The three D's are the three signs psychologists weigh together, always in context, to judge whether a pattern may be a psychological disorder: distress (the person's own suffering), dysfunction, and deviance.
Dysfunction is trouble carrying out daily life, such as working, studying, keeping a home, or keeping relationships, because of a pattern of thoughts, feelings, or behaviors.
Deviance is a departure from the norms of a person's own culture and setting; unusual behavior alone, such as training before sunrise six days a week, is never enough to signal a disorder.

Distress here means the person's own suffering: fear, sadness, or worry that hurts. It is the same everyday sense of "distress" you met with stress, now used as one of three signs.

Worked example — the three scenes. Check each scene for each D, then read the result in context.

The runner. Distress: no, the runner enjoys it. Dysfunction: no, work and school go on as usual. Deviance: yes, few people train this much. That is 1 of 3 D's. This is not a disorder. Deviance alone is never enough.
The grieving student. Distress: yes, crying most evenings. Dysfunction: yes, two missed days of class. Deviance: no. In the weeks after a death in the family, deep sadness is an expected response to a loss. That is 2 of 3 D's, and the context says this is grief, not a disorder.
The commuter. Distress: yes, waves of fear. Dysfunction: yes, missed shifts and an hour's walk to avoid the bus. Deviance: yes, most riders take the bus without this fear. That is 3 of 3 D's, lasting for months, with no context that explains it away. This is a pattern a trained professional would want to evaluate.

Now tally. There are 3 scenes × 3 D's = 9 checks. The D's marked yes are 1 + 2 + 3 = 6. Only 1 of the 3 scenes meets all three D's with no context to explain it. In words: counting D's is a start, and context finishes the job.

Context covers more than grief. A behavior that is deviant in one culture can be ordinary in another. A burst of fear that makes sense in a burning building makes no sense in a quiet kitchen. And the biopsychosocial model reminds you that biological, psychological, and social influences act together on every one of these patterns. The commuter's racing heart, the commuter's thoughts about it, and the commuter's job all belong in the picture.

An honesty note: the three D's are a way of reasoning, not a test you can score at home. Real evaluation is done by trained professionals who ask many more questions, over time, than any three-item list can.

Misconception check. Students often think that being unusual is the same as being disordered. It is tempting because "abnormal" sounds like "not normal," and unusual things stand out. The cure is the runner. Rare talents, rare hobbies, and rare beliefs are deviance without distress or dysfunction. A pattern needs suffering or real trouble in daily life, judged in context, before a professional would call it a possible disorder.

If you or someone you know is struggling, you do not have to handle it alone. Your campus counseling or health center, or a health professional you trust, is a good place to start. In the United States, you can also call or text 988 to reach the 988 Suicide & Crisis Lifeline at any hour.

2. Classify conditions, not people: the DSM-5-TR and six categories

Imagine two clinics in two cities. One uses the word "panic" for any strong fear. The other uses it only for sudden, intense waves of fear with a pounding heart. A researcher who adds up their records would be counting two different things. Shared names fix that problem.

Clinicians in the United States share one reference for those names. The DSM-5-TR is the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (American Psychiatric Association, 2022), the shared classification system clinicians in the United States use to name categories of conditions. It is a dictionary of conditions. It lets a clinician in one city and a researcher in another mean the same thing by the same word.

A diagnosis is a trained professional's conclusion, reached after a full evaluation, that a person's pattern fits a category in a classification system such as the DSM-5-TR; it describes a condition, never a person's worth. Notice the two halves. A diagnosis needs a trained professional, and it needs a full evaluation. A quick impression, an online quiz, or a chatbot's answer is neither.

Because a diagnosis names a condition and not a person, the words matter. Person-first language is wording that names the person before the condition, such as "a person living with depression" instead of "a depressive," so the condition is something a person has rather than what the person is. Compare "a schizophrenic" with "a person living with schizophrenia." The first sentence turns a whole human being into one condition. The second keeps the person in front.

This course surveys six categories. Read each one as a description of a condition, never as a checklist to apply to someone you know.

Anxiety disorders are a category of conditions marked by fear or worry that is far out of proportion to the situation, lasts over time, and often leads a person to avoid what they fear.
Obsessive-compulsive disorder (OCD) is a condition marked by obsessions, which are unwanted thoughts that keep coming back, and compulsions, which are repeated acts a person feels driven to perform to ease the anxiety the thoughts bring.
Depressive disorders are a category of conditions marked by a lasting low mood or loss of interest in once-enjoyed activities, together with changes in sleep, energy, appetite, or concentration.
Bipolar disorders are a category of conditions marked by episodes of mania, which usually alternate with episodes of depression. Mania is an episode of unusually high or irritable mood with high energy, racing thoughts, and little need for sleep that lasts for days, not a mood shift within one afternoon.
Posttraumatic stress disorder (PTSD) is a condition that can follow a traumatic event, marked by unwanted memories of the event, avoidance of reminders, negative changes in mood and thinking, and a body that stays on high alert.
Schizophrenia spectrum disorders are a category of conditions marked by psychosis and by disorganized thinking or speech; they do not involve a split or multiple personality. Psychosis is a loss of contact with reality that can include hallucinations and delusions. A hallucination is a perception of something that is not there, such as hearing a voice when no one is speaking. A delusion is a firmly held false belief that does not change when the person is shown clear evidence against it.

Worked example — placing a pattern, not a person. The commuter's pattern has sudden waves of intense fear, plus avoiding the place where they happen.

Which description does the pattern fit? Fear far out of proportion, lasting for months, with avoidance. That fits the description of the anxiety disorders, 1 of the 6 categories the course surveys.
Is that a diagnosis? No. Placing a described pattern in a category is a reading exercise. Only a professional, after a full evaluation, decides whether any diagnosis fits.
How would you say it? "The pattern described fits the anxiety-disorders category," never "the commuter is an anxiety case."

In words: you can learn the map of categories without ever pinning one on a person.

Misconception check. Students often think schizophrenia means a "split personality," and that "a little OCD" means liking a tidy desk. Both are tempting because the words get used that way in jokes and headlines. The cure is the definitions. Schizophrenia spectrum disorders involve psychosis, a loss of contact with reality, not two personalities. OCD involves unwanted, repeated thoughts and acts that bring real distress, not a preference for neat shelves. Careless words like "crazy" or "a schizophrenic" also turn a condition into an insult, which is why person-first language matters.

3. Explain why: the diathesis–stress model

Two coworkers lose their jobs in the same layoff on the same afternoon. Months later, one has found new work and feels fine. The other has developed a lasting low mood and has stopped answering friends' messages. Same event, two very different paths. Why?

Psychologists answer with the diathesis–stress model: the model that a psychological disorder develops when an underlying vulnerability, the diathesis, interacts with stress, so that neither one alone is usually enough. A diathesis is an underlying vulnerability to a disorder, such as a family history of the condition or a habit of reading events as threats.

Think of a cup and a pour of water. The diathesis is how full the cup already is. Stress is the pour. A nearly full cup overflows with a small pour; a nearly empty cup can take a large one. The overflow needs both.

Worked example — the two coworkers. Walk through the three parts in order.

Stress. Both coworkers face the same stressor: the layoff. Stress alone is equal.
Diathesis. Suppose one coworker carries a vulnerability, such as a family history of depressive disorders and a long habit of reading setbacks as proof of failure. The other does not.
Interaction. The coworker with both the vulnerability and the stress is at higher risk. The coworker with only the stress is not.

In words: the same stressor lands differently on different people, and that is a fact about vulnerability, not about character. You saw a version of this in Week 14, where the same exam was appraised two ways. Here the difference runs deeper and lasts longer.

This is why a disorder is a health condition and not a weakness. Nobody chooses a family history. Nobody chooses the layoff. A person living with a depressive disorder did not fail a test of willpower, any more than a person with asthma failed a test of breathing.

Misconception check. Students often think a "chemical imbalance" or a single gene causes a disorder by itself, or, at the other extreme, that a disorder is a sign of weak character. Both are tempting because one simple cause is easier to hold than an interaction. The cure is the model. Serotonin, for example, is associated with mood, sleep, and appetite. The evidence supports "associated with," not "causes." Genes, thoughts, and life events act together, which is exactly what the diathesis–stress model says.

4. Match the therapy to the idea, and test it

Think of five people who all want help with a fear. One wants to understand where the fear came from. One wants to be heard without judgment. One wants to practice facing it a step at a time. One wants to catch and question the thoughts that feed it. One wants to ask a physician about medication. Each request points to a different family of treatment.

Psychotherapy is treatment in which a trained professional and a person work together, mainly through conversation and planned practice, to ease distress and change patterns of thinking, feeling, and behaving. The main families each grow from an idea you already know.

Psychodynamic therapy is therapy, grown from Freud's psychoanalysis, that aims to bring hidden feelings and conflicts into awareness so a person gains insight into them. It comes from the psychodynamic family of personality theory you met in Week 12.
Client-centered therapy is Carl Rogers's humanistic therapy, in which the therapist offers empathy, genuineness, and unconditional positive regard so the person can find their own way forward. It comes from the humanistic family.
Behavior therapy is therapy that applies the principles of learning to change unhelpful behavior directly, without searching for hidden causes.
Exposure therapy is a behavior therapy that brings a person into gradual, safe, repeated contact with what they fear until the fear fades. It is Week 6's extinction at work: when the feared situation keeps arriving with no danger, the learned fear fades.
Cognitive-behavioral therapy (CBT) is therapy that helps a person notice and test unhelpful thoughts and change the behaviors that go with them.
Biomedical therapy is treatment that acts on the body, most often prescription medication, provided or overseen by a physician or other licensed prescriber.

Worked example — five therapist sentences, matched. Read each sentence and name the family it comes from.

"Let's explore what this fear might connect to from earlier in your life." This looks for hidden roots, so it is psychodynamic therapy.
"I hear how hard this has been, and I'm with you as you sort it out." This offers empathy and acceptance, so it is client-centered therapy.
"This week, let's ride one stop, then two." This is gradual, safe contact with the feared situation, so it is exposure therapy, a behavior therapy.
"When your heart races, you think 'I'm in danger.' What is the evidence for that thought?" This tests a thought, so it is cognitive-behavioral therapy (CBT).
"A physician may discuss whether medication could be part of the plan." This acts on the body, so it is biomedical therapy.

That is 5 sentences, 5 families, 1 match each. In practice the families blend: many therapists combine CBT with exposure, and medication is often used alongside psychotherapy.

What does the evidence say? CBT and exposure-based therapies have strong evidence for anxiety and depressive disorders. But how do we know? This is where Week 2 earns its place.

Worked example — how do we know CBT helps? Suppose researchers want to test CBT for a fear of riding the bus.

Assignment. Each volunteer is placed in CBT or in a waitlist control group by chance. A waitlist control group is, in a treatment experiment, the participants randomly assigned to wait and receive the treatment later, giving a baseline for comparison with the group treated now.
Variables. The independent variable (IV) is the therapy condition, CBT or waitlist. The dependent variable (DV) is operationally defined as the number of bus rides taken in a week.
Claim. Because only random assignment differs between the groups at the start, a difference in rides can be traced to the therapy.

In words: a therapy earns the word "works" from an experiment, not from a happy story. A caveat worth keeping: a study shows what happens on average across many people, so it guides a plan without promising one person's outcome.

Misconception check. Students often think that if people who go to therapy feel better, that proves the therapy worked. It is tempting because the before-and-after story feels convincing. The cure is the waitlist control group. People often feel better over time for many reasons: a stressor ends, a friend helps, or a hard season passes. Only a comparison with a randomly assigned group that waited tells you how much of the change the therapy itself caused.

5. Name stigma, and find care

A student mentions in a group chat that they have started seeing a counselor. Someone replies with a laughing emoji and the word "crazy." Nobody says anything else. The next person in that chat who is struggling has learned to stay quiet.

That moment has a name. Stigma is a set of negative stereotypes about people with a mental health condition and the prejudice and discrimination that follow from them; it is one of the main barriers that keep people from seeking care. You met stereotypes, prejudice, and discrimination in Week 13. Stigma is those three aimed at mental health. It can come from other people, and it can turn inward, when a person starts to believe the stereotypes about themself.

Stigma does its harm quietly. A person who fears being labeled may wait months or years before asking for help, or never ask at all. What pushes back?

Person-first language. "A person living with bipolar disorder" keeps the person in front of the condition.
Accurate information. Knowing that schizophrenia is not a split personality, or that OCD is not neatness, removes the fuel for jokes.
Treating disorders as health conditions. You would not mock someone for seeing a doctor about asthma. Seeing a counselor is the same kind of choice.

Worked example — rewriting the group chat. The reply was "crazy," with a laugh.

Name the problem. "Crazy" turns seeking help into a joke and a label.
Rewrite it. "Good for you for going. How's it going so far?"
Say why it matters. The rewrite treats counseling as ordinary health care, which makes the next person more likely to ask for help.

In words: one sentence can lower the barrier or raise it.

Pause and think. Choose one option and answer it in two or three sentences.

(a) Describe a phrase you have heard used as a joke about mental health, and rewrite it in accurate, person-first language.
(b) Describe one thing a campus, a workplace, or a team could do to make asking for help feel ordinary, and explain which part of stigma it targets.

Two warnings close this section. First, therapy is not only for severe conditions. People use counseling for grief, stress, relationship trouble, and big decisions, and many go before anything is "wrong." Second, a chatbot is not a diagnostic tool. An AI can explain a category, but it must never diagnose a described person, including you. If you ever ask one about your own feelings, treat its answer as a reason to talk with a professional, not as a conclusion.

Misconception check. Students often think therapy is only for people in crisis. It is tempting because the dramatic cases are the ones that make the news. The cure is to look at what counselors actually do: much of their work is helping people handle stress, grief, and change before those turn into something larger. Waiting until things are severe is one of the ways stigma keeps people from care.

6. Close the arc: six lenses on one pattern

In Week 1 you met six perspectives, six angles from which psychologists explain the same behavior. By now, you can use all six at once. Take the commuter's pattern one more time: months of sudden fear on the bus, an hour's walk to avoid it, and missed shifts.

Worked example — six lenses on the commuter. Run the same pattern through each perspective in turn.

Biological. The pounding heart is the sympathetic nervous system's fight-or-flight response, firing when there is no real danger. Treatment idea: biomedical therapy, or practice that calms the body.
Psychodynamic. Feelings and conflicts outside awareness may feed the fear. Treatment idea: psychodynamic therapy, aiming for insight.
Behavioral. Each time the commuter avoids the bus, the fear drops, so the avoidance is negatively reinforced: something unpleasant is removed, and the behavior grows stronger. Treatment idea: exposure therapy, one stop at a time.
Cognitive. The commuter reads a pounding heart as a sign of disaster ("I'm in danger"). Treatment idea: CBT, testing that thought.
Humanistic. The commuter's self-concept is shrinking around the fear ("I'm someone who can't ride the bus"). Treatment idea: client-centered therapy and its acceptance.
Sociocultural. Stigma may delay asking for help, and missed shifts add money stress. Treatment idea: reducing stigma and adding social support.

That is 6 lenses, 1 pattern. Each lens explains part of the pattern, and each points to a treatment. Put together, they are the biopsychosocial model made concrete: biological, psychological, and social influences acting on one life at once.

One limitation to keep: this exercise is about how psychologists reason, not about the commuter. The commuter is a composite, built for this course, and nobody here is being diagnosed. The skill you are practicing is looking at any behavior, your own included, with more than one lens and with care.

Misconception check. Students often think the six perspectives compete, so one must be "the real" explanation. It is tempting because the perspectives sound like rival teams. The cure is the commuter. The racing heart, the avoidance, the frightening thought, and the stigma are all true at once, and good treatment often draws on more than one of them. The perspectives work like the six sides of one object, not six answers to choose among.

Key terms

Psychological disorder — A pattern of thoughts, feelings, or behaviors that causes significant distress or dysfunction and departs from the norms of the person's culture, judged in context. (first used: 1. Draw the line: the three D's, in context)
Three D's — The three signs psychologists weigh together, always in context, to judge whether a pattern may be a psychological disorder: distress (the person's own suffering), dysfunction, and deviance. (first used: 1. Draw the line: the three D's, in context)
Dysfunction — Trouble carrying out daily life, such as working, studying, keeping a home, or keeping relationships, because of a pattern of thoughts, feelings, or behaviors. (first used: 1. Draw the line: the three D's, in context)
Deviance — A departure from the norms of a person's own culture and setting; unusual behavior alone, such as training before sunrise six days a week, is never enough to signal a disorder. (first used: 1. Draw the line: the three D's, in context)
DSM-5-TR — The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (American Psychiatric Association, 2022), the shared classification system clinicians in the United States use to name categories of conditions. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Diagnosis — A trained professional's conclusion, reached after a full evaluation, that a person's pattern fits a category in a classification system such as the DSM-5-TR; it describes a condition, never a person's worth. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Person-first language — Wording that names the person before the condition, such as "a person living with depression" instead of "a depressive," so the condition is something a person has rather than what the person is. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Anxiety disorders — A category of conditions marked by fear or worry that is far out of proportion to the situation, lasts over time, and often leads a person to avoid what they fear. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Obsessive-compulsive disorder (OCD) — A condition marked by obsessions, which are unwanted thoughts that keep coming back, and compulsions, which are repeated acts a person feels driven to perform to ease the anxiety the thoughts bring. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Depressive disorders — A category of conditions marked by a lasting low mood or loss of interest in once-enjoyed activities, together with changes in sleep, energy, appetite, or concentration. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Bipolar disorders — A category of conditions marked by episodes of mania, which usually alternate with episodes of depression. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Mania — An episode of unusually high or irritable mood with high energy, racing thoughts, and little need for sleep that lasts for days, not a mood shift within one afternoon. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Posttraumatic stress disorder (PTSD) — A condition that can follow a traumatic event, marked by unwanted memories of the event, avoidance of reminders, negative changes in mood and thinking, and a body that stays on high alert. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Schizophrenia spectrum disorders — A category of conditions marked by psychosis and by disorganized thinking or speech; they do not involve a split or multiple personality. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Psychosis — A loss of contact with reality that can include hallucinations and delusions. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Hallucination — A perception of something that is not there, such as hearing a voice when no one is speaking. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Delusion — A firmly held false belief that does not change when the person is shown clear evidence against it. (first used: 2. Classify conditions, not people: the DSM-5-TR and six categories)
Diathesis–stress model — The model that a psychological disorder develops when an underlying vulnerability, the diathesis, interacts with stress, so that neither one alone is usually enough. (first used: 3. Explain why: the diathesis–stress model)
Diathesis — An underlying vulnerability to a disorder, such as a family history of the condition or a habit of reading events as threats. (first used: 3. Explain why: the diathesis–stress model)
Psychotherapy — Treatment in which a trained professional and a person work together, mainly through conversation and planned practice, to ease distress and change patterns of thinking, feeling, and behaving. (first used: 4. Match the therapy to the idea, and test it)
Psychodynamic therapy — Therapy, grown from Freud's psychoanalysis, that aims to bring hidden feelings and conflicts into awareness so a person gains insight into them. (first used: 4. Match the therapy to the idea, and test it)
Client-centered therapy — Carl Rogers's humanistic therapy, in which the therapist offers empathy, genuineness, and unconditional positive regard so the person can find their own way forward. (first used: 4. Match the therapy to the idea, and test it)
Behavior therapy — Therapy that applies the principles of learning to change unhelpful behavior directly, without searching for hidden causes. (first used: 4. Match the therapy to the idea, and test it)
Exposure therapy — A behavior therapy that brings a person into gradual, safe, repeated contact with what they fear until the fear fades. (first used: 4. Match the therapy to the idea, and test it)
Cognitive-behavioral therapy (CBT) — Therapy that helps a person notice and test unhelpful thoughts and change the behaviors that go with them. (first used: 4. Match the therapy to the idea, and test it)
Biomedical therapy — Treatment that acts on the body, most often prescription medication, provided or overseen by a physician or other licensed prescriber. (first used: 4. Match the therapy to the idea, and test it)
Waitlist control group — In a treatment experiment, the participants randomly assigned to wait and receive the treatment later, giving a baseline for comparison with the group treated now. (first used: 4. Match the therapy to the idea, and test it)
Stigma — A set of negative stereotypes about people with a mental health condition and the prejudice and discrimination that follow from them; it is one of the main barriers that keep people from seeking care. (first used: 5. Name stigma, and find care)

Summary

A psychological disorder is judged by the three D's (distress, dysfunction, deviance) weighed together, always in context.
Deviance alone is never enough; grief after a loss is an expected response, not a disorder.
The DSM-5-TR (2022) classifies conditions, not people; a diagnosis needs a trained professional and a full evaluation.
Use person-first language: "a person living with schizophrenia," never "a schizophrenic."
The six surveyed categories are anxiety disorders, OCD, depressive disorders, bipolar disorders, PTSD, and schizophrenia spectrum disorders.
Schizophrenia spectrum disorders involve psychosis, not a split personality.
The diathesis–stress model: vulnerability plus stress, together; a disorder is a health condition, not a weakness.
Five therapy families: psychodynamic, client-centered, behavior (including exposure), CBT, and biomedical.
CBT and exposure-based therapies have strong evidence for anxiety and depressive disorders, and that evidence comes from experiments with random assignment.
Stigma keeps people from care; therapy is not only for severe conditions, and a chatbot is not a diagnostic tool.
The six perspectives work together on one pattern; that is the biopsychosocial model made concrete.

Check your understanding

Work these before looking at the answers — they are ungraded, and the answers (with reasoning) are at the bottom of the page.

Two made-up scenes. A chess player studies openings for 5 hours every day, enjoys it, and keeps up with work and friends. A night-shift cook, for 4 months, has felt so worried about contamination that they wash their hands until the skin cracks and have been sent home from work twice. Check each scene for the three D's, give the count, and say what the count can and cannot tell you.
A made-up headline reads: "Schizophrenic neighbor's split personality alarms street." Name two problems with the headline and rewrite it in accurate, person-first language.
Match each made-up therapist sentence to a therapy family.
- (a) "Let's stand near the dog park for two minutes, then five."
- (b) "What would you say to a friend who had that same thought about themself?"
- (c) "Tell me whatever comes to mind when you think about your childhood home."
- (d) "Whatever you decide, I'm here and I'm not judging you."
A made-up fitness studio says, "Members who take our breathing class report less worry, so breathing classes treat anxiety." Name the design behind the claim, explain what it can claim, and design a better test with 60 volunteers.

Answers (worked reasoning — read after attempting)

Chess player: distress no, dysfunction no, deviance yes (few people study 5 hours a day), so 1 of 3 D's. Like the runner, this is unusual but not a disorder. Cook: distress yes (constant worry, cracked skin), dysfunction yes (sent home twice), deviance yes (most cooks wash often but not to injury), so 3 of 3 D's, lasting 4 months. The count says this is a pattern a trained professional would want to evaluate. It cannot tell you a diagnosis; only a professional, after a full evaluation, decides that. (You might notice the pattern fits the description of OCD, and that is a category reading, not a diagnosis.)
Problem 1: "Schizophrenic neighbor" names the person by the condition; person-first language puts the person first. Problem 2: "Split personality" is wrong; schizophrenia spectrum disorders involve psychosis, a loss of contact with reality, not two personalities. A third problem is the alarm: it treats a health condition as a threat. Rewrite: "Neighbors learn more about schizophrenia, a treatable condition," or any version that names the person first and describes the condition accurately.
Each sentence matches one family.
- (a) Gradual, safe contact with a feared situation: exposure therapy, a behavior therapy.
- (b) Questioning a thought and looking for a fairer one: cognitive-behavioral therapy (CBT).
- (c) Searching for hidden feelings and early experiences: psychodynamic therapy.
- (d) Acceptance without judgment: client-centered therapy.
Design: nobody was assigned to anything; members chose the class and reported their worry, so this is correlational. What it can claim: in this group, taking the class was associated with less reported worry. A third variable could explain it: people with more free time may both take classes and worry less. Better test: randomly assign the 60 volunteers, 60 ÷ 2 = 30 to the breathing class and 30 to a waitlist control group. The IV is the condition (class or waitlist). The DV needs an operational definition, such as each person's score on the same worry checklist after 6 weeks. With random assignment, a difference can be traced to the class.

Next up in this module: the Readings & Resources page, the lecture tutorial, the practice set, and the quiz. Next week is finals week, where the final asks you to use every model from the course, from the biopsychosocial model to the diathesis–stress model, at once.

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