Depression is a mood (depressive) disorder defined by persistent sadness, loss of interest or pleasure in activities, and significant impairment in daily functioning, diagnosed using DSM criteria and explained in AP Psychology through perspectives like the biopsychosocial and diathesis-stress models.
Depression is the everyday name for the depressive disorders you study in Unit 5, most importantly Major Depressive Disorder. The core features are persistent sadness, loss of interest in things the person used to enjoy (anhedonia), and real impairment in daily life, like sleeping, eating, working, or maintaining relationships. That last part matters for the exam. AP Psych defines disorders using three markers from the CED: level of dysfunction, perception of distress, and deviation from social norms (5.3.A). Sadness alone isn't depression. Sadness that disrupts functioning and causes distress over time is.
What makes depression such a workhorse term in AP Psych is that every psychological perspective has an explanation for it. The cognitive perspective points to maladaptive thinking patterns, the behavioral perspective points to learned associations, the humanistic perspective points to blocked potential and missing social support, and the biological perspective points to neurotransmitters and genetics. Most psychologists use an eclectic approach, combining perspectives, and the interaction models (biopsychosocial and diathesis-stress) explain why two people with the same genes or the same stressors don't always develop the same disorder.
Depression lives at the heart of Unit 5 (Mental and Physical Health) and directly supports three learning objectives: 5.3.A (how dysfunction, distress, and deviation from norms define a disorder), 5.3.B (how each psychological perspective explains its causes), and 5.3.C (how the biopsychosocial and diathesis-stress models combine factors). It's also a classic crossover term. Antidepressant questions pull in neural firing and neurotransmitters from Unit 1, and research-design questions love using depression as the variable being measured or treated. If you can explain depression's definition, etiology, and treatment from multiple perspectives, you've basically rehearsed the entire logic of Unit 5.
Keep studying AP Psychology Unit 8
Major Depressive Disorder (Unit 5)
MDD is the specific DSM diagnosis behind the general word 'depression.' The AP exam expects the precise label, so when a question describes weeks of persistent sadness, anhedonia, and impaired functioning, your answer is Major Depressive Disorder, not just 'depression.'
Diathesis-Stress Model (Unit 5)
Depression is the go-to example for this model. A person inherits a genetic vulnerability (the diathesis), and a stressful life event triggers the disorder. It's the cleanest way to explain why one sibling develops depression after a job loss and another doesn't, which is exactly the kind of application 5.3.C asks for.
Antidepressants and Neural Firing (Units 1 and 5)
Biological treatments for depression connect straight back to how drugs influence neurotransmission. Knowing that antidepressants work by altering neurotransmitter activity lets you link a Unit 5 treatment question to Unit 1 brain chemistry in one move.
Nature and Nurture (Unit 1)
Depression is a perfect heredity-environment interaction case. Genes set the predisposition and life experiences pull the trigger, which is the same nature-nurture logic from 1.1.A applied to a disorder.
Depression usually shows up in two ways. First, as a diagnosis or etiology question: a stem describes symptoms and asks you to name the disorder, or names depression and asks which perspective or model explains its cause. Know what each perspective would blame (maladaptive thoughts, learned associations, blocked potential, neurotransmitters) and what each treatment approach would do about it. Second, as the variable in a research-methods scenario. Practice questions ask things like how you'd test whether gratitude reduces depression symptoms (that's an experiment, with random assignment and an operational definition of symptoms) or which method finds how common depression is in a college population (a survey or cross-sectional design). So you're not just memorizing a definition; you're using depression as raw material for applying methods, perspectives, and treatment evaluation. Therapist scenarios involving both anxiety and depression also reward knowing the eclectic approach.
Major Depressive Disorder is more intense but episodic, while Persistent Depressive Disorder (dysthymia) is milder but chronic, lasting years rather than weeks. On the exam, watch the time frame in the stem. Severe symptoms over a discrete period point to MDD; lower-grade gloom that drags on for years points to dysthymia.
Depression is a depressive disorder defined by persistent sadness, loss of interest, and impaired daily functioning, not just feeling sad.
AP Psych identifies disorders using three criteria: level of dysfunction, perception of distress, and deviation from social norms (5.3.A).
Each perspective explains depression differently, and most psychologists use an eclectic approach that combines them (5.3.B).
The diathesis-stress model explains depression as a genetic vulnerability triggered by stressful life experiences, while the biopsychosocial model combines biological, psychological, and sociocultural factors (5.3.C).
Antidepressants treat depression biologically by changing neurotransmitter activity, connecting Unit 5 treatment back to Unit 1 neural firing.
On research-methods questions, an experiment tests whether something reduces depression, while a survey or cross-sectional study measures how common it is.
Depression is a depressive (mood) disorder marked by persistent sadness, loss of interest in once-enjoyed activities, and impairment in daily functioning. In Unit 5, it's diagnosed using DSM criteria and the three markers of dysfunction, distress, and deviation from social norms.
No. Sadness is a normal emotion, while depression requires significant dysfunction and distress that persist over time. The AP exam specifically tests that distinction through the criteria in 5.3.A.
Major Depressive Disorder involves more severe symptoms occurring in episodes, while Persistent Depressive Disorder (dysthymia) involves milder symptoms lasting years. Severity plus duration in the question stem tells you which one to pick.
A genetic vulnerability (the diathesis) combined with stressful life experiences (the stress). Neither alone is enough, which is why the model explains why some people develop depression after stress and others don't.
Use an experiment with random assignment, a control group, and an operationally defined measure of depressive symptoms. If the question instead asks how common depression is in a population, the answer is a survey or cross-sectional study, not an experiment.