IB Psychology SLTopic 1 — Mental Health DisordersPaper 1 & 2Cognitive approach~10 min read
Beck’s Cognitive Model of Depression
Two people fail the same driving test. One shrugs and rebooks it. The other decides they are a failure at everything. Same event, completely different reaction — and for Aaron Beck, that gap is where depression lives. Not in the event, but in how it gets interpreted.
📚 What you need to know
The cognitive approach explains behaviour through mental processes: thinking, memory, perception and decision-making.
Beck argued MDD comes from faulty or irrational thought processes and heavy reliance on cognitive biases.
The cognitive triad (Beck, 1963) is negative thinking about the self, the world and the future.
Four faulty thinking patterns: personalisation, negative automatic thoughts, catastrophising, overgeneralisation.
The diathesis–stress part says some people are predisposed, and stress triggers it in them.
The model’s biggest strength is practical: it is what CBT is built on.
Its biggest weakness is causality — it explains how the thinking works, not where it came from.
The cognitive triad
Beck built his theory from working with depressed patients and noticing that their thinking kept falling into the same three grooves. He called it the cognitive triad.
The triad is usually drawn as a plain triangle. Drawing it as a cycle is more useful, because it shows why depression is so hard to get out of on your own: every belief supplies evidence for the next one.
Follow the loop with a real example. You think you are worthless, so you stop messaging your friends. They stop messaging back. That looks like proof that nobody cares. If nobody cares now, why would that ever change? And a future with no hope in it makes you feel even more worthless. The loop has now gone round once and got tighter.
This is the answer to the question people ask about depression: “why can’t they just think positively?” Because the negative thoughts are generating their own evidence. It is not stubbornness, it is a closed system — and that is why an outside intervention like CBT is needed to break in.
Features of depressed thinking
Beck suggested these irrational patterns often trace back to adverse childhood experiences. Learn all four with an example each — short-answer questions love them.
Pattern
What it does
Example
Personalisation
Blames yourself for events that had nothing to do with you.
The bus drove past without stopping, so even the bus is against me.
Negative automatic thoughts
Instantly finds the bad angle in any situation, without choosing to.
I got promoted, which just means more stress and more chances to fail.
Catastrophising
Jumps to the worst possible ending, skipping every step in between.
One low essay mark means I will fail the IB and never get a job.
Overgeneralisation
Turns one bad event into a permanent rule about everything.
That date went badly, so I will never find anyone.
The diathesis–stress part
Beck’s theory is not only about thinking. He added a diathesis–stress component: some people are naturally predisposed to developing MDD, and an environmental stressor such as losing a job can trigger it in them while leaving someone else unaffected.
The stress block is exactly the same size in both columns. That is the whole point — the event has not changed, only the person it lands on.
This also explains why MDD does not have universal triggers. One person’s vulnerability is different from another’s, and not all triggers carry the same weight for everybody.
Evaluating Beck’s model
Strengths
Good research support: Bothwell and Scott (1997) found cognitive biases were linked to depressive symptoms.
Strong practical application — the model directly underpins CBT, which helps patients identify, challenge and replace irrational thoughts.
It treats the patient as an active thinker, not a passive victim of their chemistry.
The thinking patterns are specific enough to be measured and tested.
Limitations
Limited explanatory power: it explains how irrational thinking works but not why it develops in the first place.
Culturally biased — it focuses on individual thoughts and one-to-one therapy, which fits individualistic cultures better than collectivist ones.
The direction of causality is unclear (see below).
It underplays biology, poverty, abuse and other real-world causes.
The causality problem
Beck said negative thinking leads to depression. But the opposite is just as believable: being depressed makes you think negatively. Is it possible to think yourself into depression, or does depression produce the thoughts?
Most of the supporting evidence is correlational — researchers find depressed people also have cognitive biases. That tells you the two go together. It does not tell you which one arrived first. Say this in an evaluation and you have made a proper causality argument rather than a vague one.
Change. Beck’s model does not really account for how unpredictable depression is. A person is not depressed in the same way all the time — symptoms shift, ease and return. A model built on stable thinking patterns struggles to explain that.
EXAM ANSWER
Evaluate one cognitive explanation of one disorder. [22 marks]
Open with the mechanism, not the man
Beck’s model says MDD is maintained by the cognitive triad: negative views of the self, the world and the future, each reinforcing the others.
Show it in action
Add one faulty pattern with an example, e.g. catastrophising: one poor mark becomes proof of total future failure.
Strength — make it about consequences
Its practical value is huge: CBT is built on it and reduces symptoms by challenging those thoughts. A theory that produces a working treatment has earned some credibility.
Limitation — attack the direction, not the idea
The evidence is correlational, so negative thinking may be a symptom rather than a cause.
Conclude: strong on maintenance, weak on originthat one phrase does more work than a whole paragraph of hedging
💡 Exam tips
Memorise the triad in the order self → world → future. It is easy to recall and easy to mark.
Give a real example for every thinking pattern. Definitions alone rarely reach the top band.
“Maintains” is a safer verb than “causes” when writing about the triad.
The cultural bias point pairs perfectly with the later pages on culture — you can reuse it.
Beck also works for the CBT pages in Prevention and Treatment. One theory, several answers.
If a question asks about the cognitive approach generally, this model is your safest example.
⚠ Common mix-ups
Getting the third part wrong. It is the future, not “other people”. Self, world, future.
Confusing the triad with the thinking patterns. The triad is three topics; catastrophising and the rest are three habits.
Saying Beck ignores biology. He does not — the diathesis–stress element allows for a predisposition.
Calling the model deterministic. It actually allows change, which is why therapy based on it works.
Describing CBT in detail here. Mention it as an application, but the therapy itself belongs in Prevention and Treatment.
Forgetting the date. Beck (1963) is easy marks for accurate referencing.
Up next: Negative Schemas and Depression — Beck told us what depressed thinking looks like. Schema theory tries to answer the question he left open: where did that thinking come from?
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