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Mastering the IB Psychology Extended Response Question (ERQ) is the key to demonstrating high-level psychological literacy. Unlike short-answer tasks, ERQs require you to synthesize evidence, evaluate theories, and argue toward a reasoned conclusion. To help you prepare for the exams, here are three practice questions and full-length model ERQ answers for Paper 1, Paper 2, and the HL-exclusive Paper 3.
IB Psychology ERQ Model Answers
Paper 1 Section C – Concept-Based ERQ (15 Marks)
Question: Discuss the role of bias in investigating mental health disorders within the context of health and well-being.
Model Answer:
In the investigation of mental health disorders, bias, defined as a limitation in objective thinking, plays a critical role in how we understand prevalence and treatment effectiveness. One major area of concern is clinician bias during the measurement of symptoms. If a psychologist holds a preconceived cultural filter, they may misinterpret a patient's behaviour, leading to an "imposed etic" bias. For example, in diagnosing Major Depressive Disorder (MDD), a clinician from a Western background might interpret the somatic symptoms often reported in non-Western cultures as purely physical issues rather than psychological ones, skewing diagnostic accuracy.
Furthermore, bias extends to the research process itself. Publication bias can lead to an overrepresentation of successful treatment studies in medical journals, creating a false sense of certainty regarding the efficacy of biological treatments. This relates back to the concept of responsibility. Psychologists have an ethical duty to acknowledge these biases to protect marginalized groups from stigma. To improve the investigation of these disorders, researchers must employ reflexivity, constantly reflecting on how their personal values might influence their findings. Ultimately, while complete objectivity is difficult in human sciences, recognizing bias is essential for a valid understanding of mental health.
Why this is a strong response:
This response fully explains the complex links between core concepts. It demonstrates a thorough understanding of how bias fundamentally impacts the measurement and diagnostic validity of disorders like MDD. By explicitly connecting researcher responsibility to the ethical need for reflexivity, the essay moves beyond simple description into a well-developed critical analysis. The argument is cohesive, leading to a conclusion that emphasizes the necessity of acknowledging subjective filters to improve psychological literacy. Furthermore, the accurate use of subject-specific terminology, such as "imposed etic" and "reflexivity," ensures that all relevant points are detailed and precise as required by the markbands.
Paper 2 Section B – Evaluation of Unseen Research (15 Marks)
Question: Evaluate the provided stimulus study regarding the effects of technology on human development with reference to the concepts of change and causality.
Model Answer:
The provided study investigates the impact of early social media exposure on the development of self-identity in adolescents. When evaluating this research through the lens of causality, a primary concern is bidirectional ambiguity. While the study suggests that increased screen time leads to developmental delays in social skills, it is equally possible that children with pre-existing social difficulties are more likely to seek out digital interactions. Because much research in this field is correlational, establishing a direct cause-and-effect relationship remains a significant challenge.
Regarding the concept of change, the study highlights how technology can act as a deliberate catalyst for behavioural shifts in young people. The longitudinal design of the research allows us to observe whether these changes are gradual developmental maturations or sudden disruptions caused by technological environmental factors. However, the study’s reliance on self-selected sampling potentially introduces sampling bias, which limits the generalizability of these findings to a broader population. In conclusion, while the study provides valuable insights into modern developmental shifts, its findings must be interpreted with caution due to the complexities of isolating technological variables in natural conditions.
Why this is a strong response:
This response secures the highest markband by showing very good critical engagement with the stimulus study through at least two specified concepts. It accurately identifies sophisticated methodological limitations, such as bidirectional ambiguity and the difficulty of isolating variables in naturalistic settings. By linking the concept of change to the specific benefits and drawbacks of a longitudinal design, the response provides a nuanced appraisal of how developmental shifts are tracked over time. Each evaluative point is effectively supported by specific references to the source material, ensuring the analysis is grounded and not generic. Finally, the essay reaches a balanced and clearly stated conclusion regarding the study's internal and external validity.
Paper 3 Question 4 – Synthesis and Validity (HL Only, 15 Marks)
Question: Interpret the three provided sources and use your knowledge of the motivation extension to discuss the validity of the claim: "Intrinsic motivation is the most significant predictor of long-term learning success."
Model Answer:
The claim that intrinsic motivation is the primary predictor of learning success can be evaluated by synthesizing the provided sources and applying self-determination theory. Source A provides quantitative data showing that students with high internal interests have higher retention rates over five years, supporting the claim that intrinsic factors lead to long-term change in cognition. Source B, however, presents a different perspective via qualitative interviews, suggesting that extrinsic motivators, like grades or parental rewards, are often necessary to initiate engagement before a student develops a personal interest.
Source C adds complexity by illustrating how excessive extrinsic rewards can actually decrease intrinsic motivation, a phenomenon known as the overjustification effect. This suggests that while the claim is largely valid for long-term outcomes, it ignores the critical role that secondary motives play in the initial stages of learning. Synthesizing these perspectives, we can conclude that the claim is partially valid; intrinsic motivation is indeed the engine of long-term success, but it often exists in a delicate balance with external influences. A more accurate model of learning success must therefore acknowledge the interdependence of both motivational types.
Why this is a strong response:
This Higher Level response demonstrates excellence by effectively interpreting at least three disparate sources to evaluate a central claim. It utilizes detailed knowledge from the motivation extension, specifically applying self-determination theory to explain the nuances of behavioural change. The response identifies and evaluates competing perspectives, such as the role of extrinsic rewards in initiating engagement versus their potential to undermine long-term intrinsic interest. By synthesizing quantitative data with qualitative findings, the essay constructs a sophisticated argument that recognizes the interdependence of multiple variables. The final conclusion is reasoned, clearly stated, and perfectly consistent with the evidence presented across all sources.
We hope you found this post helpful! For more useful materials associated with the IB, check out the wide variety of IA, EE and TOK exemplars available at Clastify and other guides available on our blog.
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