Mood (affective) disorders: depressive disorder (unipolar) and bipolar disorder

Welcome to the Study of Mood Disorders!

Hello! Today we are diving into one of the most interesting parts of Psychology: Mood (Affective) Disorders. If you’ve ever wondered why some people experience extreme "highs" and "lows," or why others feel stuck in a deep "low" for a long time, this chapter will help you understand the science behind it. We will look at Unipolar Depression and Bipolar Disorder, why they happen, and how psychologists help people manage them.

Don’t worry if some of the medical terms look a bit scary at first—we will break them down into simple pieces together!

1. What are Mood (Affective) Disorders?

In psychology, "Affect" is just a fancy word for mood or emotion. A mood disorder is when a person’s emotional state is distorted or inconsistent with their circumstances and interferes with their ability to function.

A. Unipolar Depression (Depressive Disorder)

Imagine your mood is like the weather. Most people have sunny days and rainy days. However, someone with Unipolar Depression feels like they are stuck in a heavy, permanent storm. It is called "unipolar" because the mood only goes in one direction: down.

B. Bipolar Disorder

This is like a rollercoaster. People with Bipolar Disorder experience two extremes:

1. Depression: The extreme "lows" (feeling hopeless/sad).
2. Mania: The extreme "highs" (feeling overexcited, full of energy, and sometimes making risky decisions).

Quick Review:
• Unipolar: Just the "lows."
• Bipolar: Both "highs" (mania) and "lows" (depression).

2. Characteristics and Diagnosis

Psychologists use special manuals (like the ICD-11 or DSM-5) to diagnose these disorders. They look for specific symptoms that last for a certain amount of time (usually at least 2 weeks).

Common Symptoms of Depression:

• Emotional: Intense sadness, loss of interest in hobbies (this is called anhedonia).
• Cognitive: Difficulty concentrating, feeling worthless, or thoughts of self-harm.
• Physical: Sleeping too much or too little, eating more or less than usual, and feeling exhausted.

Common Symptoms of Mania (Bipolar):

• Emotional: Feeling "on top of the world" or extremely irritable.
• Cognitive: Racing thoughts, jumping from one idea to another, and high self-esteem.
• Physical: Little need for sleep, talking very fast, and being very active.

Key Takeaway: Diagnosis isn't just about feeling "sad." It's about a cluster of symptoms that stop a person from living their normal life.

3. Explaining Mood Disorders: Why do they happen?

There isn't just one reason. Psychologists look at Biological and Cognitive explanations.

A. The Biological Explanation (Nature)

This view says that mood disorders come from our genes or brain chemistry.

• Genetics: Research shows that if your twin has a mood disorder, you are more likely to have one too. This suggests it can be inherited.
• Neurochemicals: Our brains use chemicals called neurotransmitters to send messages. The Monoamine Hypothesis suggests that depression is caused by low levels of Serotonin and Norepinephrine. Think of these like the "fuel" that keeps your mood engine running; if the fuel is too low, the engine stalls.

B. The Cognitive Explanation (Nurture/Thinking)

This view says it’s not just about biology, but how we think. Two famous theories are:

1. Beck’s Cognitive Triad:
Aaron Beck argued that depressed people have a "negative schema" (a negative pair of glasses they view the world through). They have negative thoughts about:
• The Self ("I am a failure.")
• The World ("Everything is going wrong.")
• The Future ("It will always be this way.")

2. Seligman’s Learned Helplessness:
This happens when someone experiences many bad events they can't control. Eventually, they "learn" that they are helpless and stop trying to change things, even when they could. It’s like a bird that stays in a cage even after the door is opened because it’s "learned" it can’t escape.

Memory Aid: Use S.W.F. for Beck’s Triad: Self, World, Future!

4. Treatments: How can we help?

A. Biological Treatments

• Drug Therapy: Doctors often prescribe SSRIs (Selective Serotonin Reuptake Inhibitors). These help keep more Serotonin active in the brain. It’s like plugging a leak in a water tank to keep the water level high.
• ECT (Electroconvulsive Therapy): This is usually a last resort for very severe depression. A small electric current is passed through the brain while the patient is under anesthesia. It’s like "restarting" a frozen computer.

B. Cognitive Treatments

• CBT (Cognitive Behavioural Therapy): This is a talking therapy. The therapist helps the patient identify their negative "S.W.F." thoughts and replace them with realistic ones. If a student thinks "I failed one test, so I am a total failure," the therapist helps them see that one test doesn't define their whole life.

Common Mistake to Avoid: Don't say that drugs "cure" depression instantly. They help manage the symptoms, and often work best when combined with therapy like CBT!

Quick Review Box

• Unipolar Depression: Low mood only.
• Bipolar Disorder: Cycles of low mood (depression) and high mood (mania).
• Biological cause: Low Serotonin or genetic inheritance.
• Cognitive cause: Negative thinking patterns (Beck) or feeling out of control (Seligman).
• Main treatments: SSRI drugs and Cognitive Behavioural Therapy (CBT).

You've reached the end of the notes for Mood Disorders! Take a deep breath—you're doing great. Psychology is all about understanding the human experience, and you've just taken a big step in doing that.