2024 IB DP Psychology 模擬試題連答案詳解

Neuroplasticity is the brain's capacity to reorganize its neural pathways and adapt its structure in response to environmental demands, learning, or injury. This occurs through mechanisms like dendritic branching (where neurons grow new dendrites to form new synapses) and synaptic pruning (where unused connections are eliminated). A key study demonstrating neuroplasticity is Draganski et al. (2004). The aim of the study was to investigate whether structural changes in the human brain could occur in response to learning a new motor skill (juggling). The researchers used a sample of 24 non-jugglers who underwent a baseline MRI scan. Participants were split into two groups: jugglers and non-jugglers. The jugglers practiced a 3-ball classic cascade routine and were scanned a second time when they reached mastery. They were then instructed to stop juggling for three months, after which a final scan was conducted. The control group did not learn juggling and was scanned at the same intervals. The MRI results showed that after mastering the juggling routine, the jugglers had a significant increase in grey matter density in the mid-temporal area of both hemispheres, an area associated with visual memory and the perception of motion. After three months of no practice, this grey matter density decreased. The control group showed no changes. This study demonstrates neuroplasticity by showing that learning a new skill leads to structural changes in the brain (grey matter expansion) to accommodate the new function, and that these changes can reverse when the stimulation ceases (synaptic pruning).

3 marks: Clear, accurate definition and explanation of neuroplasticity, including the mechanisms involved (such as dendritic branching or pruning). 3 marks: Accurate description of a relevant study (aim, method, findings) that demonstrates neuroplasticity. 3 marks: Explicit link explaining how the findings of the study demonstrate neuroplasticity in response to learning or experience.

The Multi-Store Model (MSM) of memory, proposed by Atkinson and Shiffrin (1968), represents memory as a flow of information through a series of discrete stores. The model consists of three main stores: sensory memory, short-term memory (STM), and long-term memory (LTM). Sensory memory has a high capacity but very limited duration (less than a second) and requires attention to transfer information to STM. STM has a limited capacity (about 7 items) and duration (about 18-30 seconds). Information in STM must be rehearsed (maintenance rehearsal) to remain there or be transferred to LTM through elaborative rehearsal. LTM has an unlimited capacity and duration. To use stored information, it must be retrieved back into STM. A study supporting this model is Glanzer and Cunitz (1966), which investigated the serial position effect. Participants heard a list of 15 words and were asked to recall them immediately or after a 30-second delay with a filler task (counting backward). In the immediate recall condition, participants showed both the primacy effect (high recall of early words) and the recency effect (high recall of late words). In the delayed condition, the primacy effect remained, but the recency effect disappeared. This supports the MSM by showing that early words had been transferred to LTM through rehearsal (primacy effect), while later words were still in STM and were lost during the delay due to displacement by the filler task (recency effect), demonstrating that STM and LTM are distinct and separate systems.

3 marks: Detailed and accurate explanation of one model of memory, including its components and processes. 3 marks: Accurate description of a relevant study (aim, method, findings) supporting the model. 3 marks: Clear explanation of how the findings of the study support the specific features or structure of the chosen memory model.

Social Cognitive Theory (SCT), proposed by Albert Bandura, explains human behavior as the result of reciprocal determinism-the dynamic interaction between personal, behavioral, and environmental factors. A core component of SCT is observational learning, which occurs when an individual observes a model's behavior and subsequently mimics it. Bandura identified four cognitive conditions required for observational learning: attention (focusing on the model), retention (remembering the behavior), reproduction (possessing the ability to perform the behavior), and motivation (having the desire to perform it, influenced by vicarious reinforcement or punishment). Bandura, Ross and Ross (1961) demonstrated SCT through the Bobo Doll experiment. The study aimed to test if children would imitate aggressive behavior modeled by an adult. Children aged 3 to 6 were split into groups. One group observed an adult model acting aggressively toward an inflatable Bobo Doll (punching, kicking, and striking it with a mallet). A second group observed a non-aggressive model playing quietly. A third group was a control with no model. After observing, the children were placed in a room with toys, including the Bobo Doll, and their behavior was recorded. The results showed that children who observed the aggressive model exhibited significantly more aggressive acts than the other groups. Furthermore, children were more likely to imitate same-sex models. This study supports Social Cognitive Theory by showing that children can acquire novel behaviors simply through passive observation (attention and retention) without direct reinforcement, and reproduce them when given the opportunity (reproduction and motivation).

3 marks: Clear, accurate explanation of Social Cognitive Theory, highlighting key components such as observational learning, cognitive mediators, or self-efficacy. 3 marks: Accurate description of a relevant study (aim, method, findings) illustrating the theory. 3 marks: Explicit link explaining how the study's findings support the specific cognitive and social processes described by Social Cognitive Theory.

### Introduction
Brain imaging technologies have revolutionized biological psychology by allowing researchers to study the living brain non-invasively. Prior to these technologies, researchers had to rely on post-mortem autopsies or invasive animal studies to infer brain-behaviour relationships. Today, techniques such as Magnetic Resonance Imaging (MRI) and functional Magnetic Resonance Imaging (fMRI) are widely used. This essay will evaluate MRI and fMRI, arguing that while they provide unprecedented insights into brain structure and active cognitive processes, their utility is constrained by issues of ecological validity, correlational designs, and technological limitations.

### Technique 1: Magnetic Resonance Imaging (MRI)
An MRI scan is a static imaging technique that provides detailed three-dimensional images of brain structure. It works by placing the participant in a strong magnetic field, which aligns the proton spins of hydrogen atoms in the body's water molecules. When radiofrequency pulses are applied and then turned off, these protons emit signals as they return to their original alignment. Because different tissues (such as grey matter, white matter, and cerebrospinal fluid) contain different concentrations of water, they emit distinct signals, which a computer processes into high-resolution structural images.

#### Supporting Study: Maguire et al. (2000)
Maguire et al. used MRI scans to investigate structural neuroplasticity in the hippocampi of London taxi drivers. They compared the MRI brain scans of 16 right-handed male taxi drivers (who had completed 'The Knowledge' licensing test) with 50 healthy, right-handed male non-taxi drivers. The structural MRI scans revealed that the taxi drivers had significantly increased grey matter volume in their posterior hippocampi compared to the control group. Furthermore, a positive correlation was found between the volume of the posterior hippocampus and the amount of time spent working as a taxi driver.

Linking to the technique: MRI was crucial to this study because it allowed the researchers to precisely and non-invasively measure structural differences in vivo. Without the high spatial resolution of structural MRI, measuring microscopic changes in grey matter volume across living participants would have been impossible.

#### Evaluation of MRI
* Strengths: MRI is entirely non-invasive and does not expose participants to harmful ionizing radiation (unlike PET or CT scans). It has excellent spatial resolution, allowing detailed mapping of tiny anatomical structures.
* Limitations: MRI only provides a static, structural snapshot of the brain; it cannot show functional brain activity in real time. Additionally, the scan environment is highly confined and noisy, which can cause anxiety or claustrophobia in participants, potentially affecting their physiological state. Motion artifacts also present a challenge, as participants must remain completely still.

### Technique 2: Functional Magnetic Resonance Imaging (fMRI)
Unlike MRI, fMRI measures brain activity in real time by tracking dynamic physiological changes. It relies on the Blood-Oxygen-Level-Dependent (BOLD) signal. When a specific brain region becomes active, it consumes more oxygen, prompting an increase in oxygenated blood flow to that area. Because oxygenated and deoxygenated hemoglobin have different magnetic properties, the fMRI scanner can detect these local magnetic fluctuations, mapping which brain regions are active during specific cognitive tasks.

#### Supporting Study: Sharot et al. (2007)
Sharot et al. used fMRI to investigate the neural mechanisms underlying flashbulb memories of the 9/11 terrorist attacks. Three years after the attacks, 24 participants who had been in New York City on 9/11 were placed in an fMRI scanner. They were presented with cue words on a screen linked to either the 9/11 attacks or a personal summer holiday control event, and were asked to retrieve memories associated with those cues. The fMRI scans showed that participants who were closer to the World Trade Center during the attacks exhibited selective activation of the amygdala (the brain's emotional center) when recalling 9/11 compared to summer events, whereas those further away did not.

Linking to the technique: fMRI allowed researchers to observe active neural processes during memory retrieval. This real-time functional mapping provided biological evidence supporting the theory that distinct emotional pathways (specifically involving the amygdala) are engaged during the retrieval of highly shocking, personally significant memories.

#### Evaluation of fMRI
* Strengths: fMRI offers excellent spatial resolution and allows researchers to observe dynamic functional relationships between brain regions and ongoing cognitive tasks. Like MRI, it is non-invasive and safe.
* Limitations: fMRI has a poor temporal resolution (approximately 1 to 4 seconds) due to the hemodynamic response delay (the time it takes for blood flow to adjust to neural activity). The environment inside the scanner is highly artificial, which reduces the ecological validity of the cognitive tasks being performed. Crucially, fMRI data is highly correlational; observing activation in a brain area during a task does not definitively prove that the area is causally responsible for the behaviour.

### Conclusion
In conclusion, brain-imaging techniques have drastically advanced the field of biological psychology. MRI is exceptional for demonstrating structural changes and neuroplasticity, while fMRI excels at mapping active cognitive processes in real time. However, researchers must remain cautious of over-interpreting brain scans, as correlation does not equal causation, and the highly artificial scanner environment may alter natural cognitive and emotional processing. Combining these imaging techniques with behavioural studies remains the most robust pathway forward in neuroscience.

This essay is evaluated out of 22 marks based on the IB Psychology Paper 1 Section B rubric:

### Criterion A: Focus on the question (2 marks)
* 2 marks: The response is fully focused on the question, offering a highly relevant evaluation of brain imaging techniques (such as MRI and fMRI) in relation to behaviour throughout the essay.
* 1 mark: The response is partially focused on the question but contains irrelevant material or lacks consistent focus on the evaluation of the techniques themselves.

### Criterion B: Knowledge and understanding (6 marks)
* 5-6 marks: Demonstrates detailed, accurate, and comprehensive knowledge and understanding of the chosen techniques (e.g., explain magnet/radio waves for MRI, BOLD signal for fMRI) and their relation to behaviour (e.g., neuroplasticity, flashbulb memory). Relevant psychological terminology is used consistently and appropriately.
* 3-4 marks: Explains the techniques with some accuracy, but may lack depth or biological detail. Some terminology is used correctly.
* 1-2 marks: Minimal or highly superficial understanding of how the techniques work or their relation to behaviour.

### Criterion C: Use of research to support knowledge (6 marks)
* 5-6 marks: Relevant research (e.g., Maguire et al., Sharot et al.) is clearly described and effectively linked to the evaluation of the techniques. The studies directly support the arguments made.
* 3-4 marks: Research is described but is not fully integrated or clearly linked to the evaluation of the techniques. There may be minor inaccuracies in the study details.
* 1-2 marks: Little or no relevant research is used, or the studies cited are largely inaccurate or misunderstood.

### Criterion D: Critical thinking (6 marks)
* 5-6 marks: Critical evaluation is well-developed, balanced, and insightful. Both strengths and limitations of the techniques are clearly discussed (e.g., resolution, non-invasiveness, temporal vs. spatial resolution, ecological validity, correlational nature, sample size issues in neuroimaging).
* 3-4 marks: Evaluation is present but may be limited, unbalanced, or superficial (e.g., simply listing pros and cons without deep analysis).
* 1-2 marks: Very limited critical thinking; the essay is mostly descriptive with little to no evaluation.

### Criterion E: Clarity and organisation (2 marks)
* 2 marks: The essay is well-structured, logical, and easy to follow. It includes a clear introduction, structured body paragraphs with smooth transitions, and a reasoned conclusion.
* 1 mark: The essay has some structure but lacks logical flow or clear organization.

### Introduction
* Define etiology as the study of the causes or origins of a psychological disorder.
* Identify the psychological disorder to be discussed: Major Depressive Disorder (MDD).
* Introduce key sociocultural factors: social vulnerability (vulnerability models), chronic stressors (such as low socioeconomic status or discrimination), and cultural concepts of distress.
* State the thesis: While sociocultural factors provide critical explanatory frameworks for the onset and manifestation of MDD, they must be evaluated in conjunction with biological and cognitive predispositions (interactionist approach).

### Body Paragraph 1: Social Vulnerability and Life Stressors (Vulnerability Model)
* Theoretical Framework: Brown and Harris's (1978) Social Factors in Depression model. This model posits that depressive episodes are triggered by provoking agents (life events) acting upon pre-existing vulnerability factors.
* Key Study: Brown and Harris (1978).
* Aim: To investigate how social origins and life events relate to the onset of depression in women.
* Method: Surveyed 458 women in London on their daily lives and depressive episodes.
* Findings: 82% of those who became depressed had experienced a severe life event in the past year. Crucially, they identified four vulnerability factors: having three or more children under 14 at home, lack of an intimate/confiding relationship, unemployment, and loss of one's mother before the age of 11.
* Interpretation: Sociocultural conditions (e.g., social class, isolation, gender expectations) act as vulnerability factors that interact with acute stressors to trigger depression.
* Evaluation: High ecological validity, but heavily gender-biased (only female participants) and correlational (cannot establish direct cause-and-effect).

### Body Paragraph 2: Cultural Variations and Symptom Presentation
* Theoretical Framework: Cultural norms shape how distress is experienced, interpreted, and communicated. This affects diagnosis rates and the perceived etiology of the disorder (somatization vs. psychologization).
* Key Study: Parker, Cheah, and Roy (2001).
* Aim: To compare the presentation of depressive symptoms in Malaysian Chinese and Australian Caucasian patients.
* Method: Outpatients diagnosed with MDD completed a questionnaire assessing their primary presenting symptoms.
* Findings: Malaysian Chinese patients were significantly more likely to report physical (somatic) symptoms (e.g., headaches, fatigue) as their primary reason for seeking help, whereas Caucasian patients reported cognitive/emotional symptoms (e.g., depressed mood, sadness).
* Interpretation: Cultural factors influence the cognitive schema through which individuals interpret emotional distress, impacting how the etiology of the disorder is constructed and diagnosed across cultures.
* Evaluation: Demonstrates the limitation of Western diagnostic criteria (DSM) and highlights the role of cultural factors in the apparent etiology and diagnosis of MDD.

### Synthesis and Critical Evaluation
* The Diathesis-Stress Model: Discuss how sociocultural factors do not act in a vacuum. A biological predisposition (e.g., the short alleles of the 5-HTT gene) may require a sociocultural trigger (e.g., severe life events, low social support) to manifest as MDD (Caspi et al., 2003).
* Methodological Limitations: Much of the research is correlational, making bidirectional ambiguity an issue (e.g., does low socioeconomic status cause depression, or does depression lead to lower socioeconomic status?). Self-reporting biases and cross-cultural translation issues also complicate findings.

### Conclusion
* Summarize how sociocultural factors such as social vulnerability and cultural schemas play an essential role in the etiology and expression of MDD. Conclude that a multidimensional, interactionist approach is necessary to fully understand the disorder.

### Mark Breakdown (Total: 22 Marks)

* Criterion A: Focus on the prompt (1–6 marks)
* 1–2 marks: The response is descriptive and lacks focus on the influence of sociocultural factors on etiology.
* 3–4 marks: The response identifies sociocultural factors and a disorder, but the link to etiology is weak or superficial.
* 5–6 marks: The response is highly focused on how sociocultural factors influence the etiology of the chosen disorder(s).

* Criterion B: Knowledge and understanding (1–6 marks)
* 1–2 marks: Minimal or superficial knowledge of sociocultural factors/theories.
* 3–4 marks: Adequate knowledge of sociocultural theories (e.g., vulnerability model, cultural factors) is demonstrated, but there may be minor inaccuracies.
* 5–6 marks: Comprehensive and accurate knowledge of sociocultural factors, vulnerability models, and cultural influences on etiology is demonstrated.

* Criterion C: Use of research (1–4 marks)
* 1–2 marks: Studies are described but are of marginal relevance or lack detail.
* 3–4 marks: Relevant studies (e.g., Brown & Harris, 1978; Parker et al., 2001) are described clearly and effectively support the arguments.

* Criterion D: Critical thinking (1–6 marks)
* 1–2 marks: Little to no evaluation or critical discussion.
* 3–4 marks: Some critical evaluation of theories and studies is present, such as recognizing methodological limitations or suggesting an interactionist view.
* 5–6 marks: Well-developed critical evaluation of the sociocultural explanations, exploring their strengths, limitations, ethical issues, and interaction with biological or cognitive factors (e.g., diathesis-stress model).

### Introduction
* Define health-related behaviour (actions taken by individuals that affect their physical health, such as smoking, exercise, or dietary choices).
* Introduce cognitive/social cognitive models, which argue that individuals make conscious, rational decisions about their health based on beliefs, attitudes, and social perceptions.
* State the models to be evaluated: The Health Belief Model (HBM) and/or The Theory of Planned Behaviour (TPB).
* State the thesis: While these models provide structured frameworks for predicting health actions and designing campaigns, they often overemphasize rational decision-making and underestimate emotional, biological, and environmental barriers.

### Body Paragraph 1: Explaining and Researching the Health Belief Model (HBM)
* Theoretical Framework: The HBM (Rosenstock, 1974) posits that health behaviour is determined by a person's perception of a threat (perceived susceptibility and severity) and their evaluation of the behaviors to counteract it (perceived benefits vs. perceived barriers), alongside cues to action and self-efficacy.
* Key Study: Quist-Paulsen et al. (2003).
* Aim: To investigate the effectiveness of a smoking cessation intervention based on fear arousal (perceived threat/severity).
* Method: Coronary heart disease patients who smoked were randomly assigned to a control group or an intervention group that received personalized advice and fear-inducing information about the risks of continued smoking (manipulating perceived susceptibility and severity).
* Findings: 57% of the intervention group stopped smoking compared to 37% of the control group.
* Interpretation: Increasing the cognitive perception of susceptibility and severity (threat) directly influenced positive health-related behavior change, supporting the HBM.
* Evaluation: High practical application, but raises ethical concerns regarding fear-induction and assumes individuals act purely on rational assessments of risk.

### Body Paragraph 2: Explaining and Researching the Theory of Planned Behaviour (TPB)
* Theoretical Framework: The TPB (Ajzen, 1991) suggests that behavioural intention is the direct precursor to behaviour. Intention is determined by three factors: attitude toward the behaviour, subjective norms (social pressure), and perceived behavioural control (self-efficacy).
* Key Study: Guo et al. (2007).
* Aim: To test the efficacy of the TPB in predicting physical activity among adolescents.
* Method: Correlational design assessing adolescents' attitudes, subjective norms, perceived behavioral control, intentions, and self-reported exercise levels.
* Findings: Perceived behavioural control and positive attitudes were the strongest predictors of the intention to exercise, which in turn predicted actual exercise levels.
* Interpretation: Demonstrates that cognitive intentions and beliefs about control are strong predictors of health behavior, supporting the TPB.

### Synthesis and Critical Evaluation
* Strengths:
* Highly useful for designing public health promotion campaigns (e.g., structuring anti-smoking or exercise advertisements to target attitudes or cues to action).
* High predictive validity for structured, deliberate health choices (e.g., getting vaccinated).
* Limitations:
* The Intention-Behaviour Gap: Both models struggle to explain why people often intend to engage in a health behaviour but fail to do so (the "action gap").
* Assumption of Rationality: Humans are often irrational and influenced by immediate cognitive biases, emotions (e.g., stress, denial), and social pressures not captured by these models.
* Neglect of Biological and Environmental Constraints: Addiction (e.g., nicotine), genetics, and socio-economic barriers (e.g., lack of access to healthy food or safe exercise spaces) are largely omitted.
* Methodological Issues: Much of the research relies on self-report questionnaires, which are prone to social desirability bias.

### Conclusion
* Summarize the core benefits of cognitive models (systematic, testable) and their primary limitations (over-rationalization, intention-behaviour gap).
* Conclude that cognitive models are most effective when integrated with biological, emotional, and systemic environmental factors (a biopsychosocial approach).

### Mark Breakdown (Total: 22 Marks)

* Criterion A: Focus on the prompt (1–6 marks)
* 1–2 marks: The essay is mostly descriptive and fails to evaluate the model(s) effectively.
* 3–4 marks: The essay describes the model(s) and provides some relevant but limited evaluation.
* 5–6 marks: The essay is clearly focused on evaluating the cognitive/social cognitive model(s), with a balanced focus on both explanations and critiques.

* Criterion B: Knowledge and understanding (1–6 marks)
* 1–2 marks: Simple or superficial knowledge of the chosen model(s) is shown.
* 3–4 marks: The components of the model(s) (e.g., HBM components, TPB components) are explained accurately with minor gaps.
* 5–6 marks: Detailed, comprehensive, and accurate knowledge of the model's components and underlying cognitive theories is demonstrated.

* Criterion C: Use of research (1–4 marks)
* 1–2 marks: Relevant studies are mentioned but are poorly explained or fail to link to the model.
* 3–4 marks: Relevant studies (e.g., Quist-Paulsen et al., 2003; Guo et al., 2007) are clearly outlined, explained, and explicitly connected to the components of the model.

* Criterion D: Critical thinking (1–6 marks)
* 1–2 marks: The response lacks evaluation or relies on generic statements.
* 3–4 marks: There is some evaluation of the models (e.g., noting the intention-behaviour gap or reliance on self-reporting).
* 5–6 marks: Excellent evaluation. The response critically analyzes the assumptions of rationality, the intention-behaviour gap, methodological limitations of supporting research, and contrasts these cognitive models with alternative perspectives (e.g., biological or environmental models).

To answer this question successfully:
1. Identify the design: State that the design is an independent measures design (or between-groups/between-subjects design) as participants are allocated to either the experimental or control group, but not both. (1 mark)
2. Explain an advantage: Describe how this design controls for order effects (such as learning, practice, or fatigue) because participants only experience one condition. (1 mark)
3. Contextualize to the study: Link this advantage specifically to the scenario. In this study, if participants did both the cognitive game and the trivia game, their performance on the second computerized digit-span test might improve simply because of practice with the test itself, rather than the cognitive-training game. Independent measures prevents this confound. (1 mark)

Award 1 mark for correctly identifying the design as an independent measures design (or independent groups/between-subjects design).
Award 1 mark for explaining a valid general advantage of this design (e.g., prevention of order effects, reduced risk of demand characteristics).
Award 1 mark for explicitly linking this advantage to the context of the study (e.g., explaining how it prevents practice effects on the computerized digit-span test).

To answer this question successfully:
1. Outline an ethical consideration: Identify a relevant ethical guideline, such as informed consent, protection from harm, or the right to withdraw. (1 mark)
2. Explain a resolution: Detail how the researcher can actively address and resolve this ethical concern. (1 mark)
3. Contextualize to the study: Connect the resolution to the specific parameters of this study, such as the requirement for participants to play the games for 20 minutes daily over a 3-week period. (1 mark)

Award 1 mark for identifying a relevant ethical consideration (e.g., informed consent, right to withdraw, protection from mental fatigue/harm).
Award 1 mark for outlining how this ethical consideration can be resolved (e.g., using a consent form, clarifying withdrawal policies without penalty).
Award 1 mark for linking the resolution to the specific context of this study (e.g., mentioning the demanding 3-week daily commitment of playing games for 20 minutes).

To answer this question successfully:
1. Explain self-selection/volunteer bias: Note that individuals who volunteer for studies are often systematically different from those who do not (e.g., higher motivation, higher interest in cognitive enhancement, or more free time). (1 mark)
2. Identify the demographic limitation: Point out that the sample consists entirely of university students, who may already have unique baseline cognitive capacities and study habits compared to the general public. (1 mark)
3. Link to generalizability and study demands: Explain how this affects the findings. Highly motivated student volunteers are more likely to comply with the 3-week daily commitment of playing the game, meaning the game's efficacy might not generalize to the wider, less compliant, or older public who may find the routine harder to maintain. (1 mark)

Award 1 mark for explaining the concept of volunteer/self-selection bias (i.e., volunteers differ systematically from the general population).
Award 1 mark for identifying the demographic limitation of the sample (university students) and how it restricts external validity.
Award 1 mark for explaining the consequences on the findings' generalizability (e.g., linking motivation levels to compliance with the 3-week daily training protocol).

### Two Ethical Considerations and How to Address Them

#### 1. Confidentiality and Anonymity
* Ethical Issue: The researchers published raw, un-aggregated pre- and post-test scores along with highly specific demographic details (gender, age, and academic major) of the university students. Because university environments are relatively small communities, combining these specific variables makes it highly possible to identify individual participants and their corresponding social anxiety scores, thereby violating the ethical principle of confidentiality.
* Resolution: To address this, the researchers should only publish aggregated data (such as means, standard deviations, and effect sizes) rather than individual raw scores. If sharing raw data is required for peer review, they must strictly sanitize the database by removing identifying variables (like academic major and exact age) and assigning random participant codes instead.

#### 2. Protection from Harm (Withholding Treatment / Use of a Waitlist Control)
* Ethical Issue: The study involved participants with moderate social anxiety. By placing half of them in a waitlist control group for 6 weeks without any active treatment, the researchers may have allowed their psychological distress to persist or worsen, violating the core principle of minimizing harm to participants.
* Resolution: The researchers can address this by utilizing a waitlist-crossover design. Once the 6-week trial is complete and the CBT program's efficacy is established, the researchers must immediately offer the active CBT program to the control group free of charge. Additionally, the researchers should establish a safety protocol to monitor the control participants' mental health during the 6 weeks, offering immediate intervention if any participant's condition deteriorates.

Marking Scheme (Total: 6 marks)

For each of the two ethical considerations (up to 3 marks each):
* 1 mark for identifying and describing a relevant ethical consideration (e.g., confidentiality/anonymity, protection from harm/withholding treatment).
* 1 mark for linking the ethical consideration directly and accurately to the stimulus material (e.g., publishing raw scores with age/major, or keeping anxious students on a waitlist without therapy).
* 1 mark for explaining a realistic and appropriate way the researchers could address or resolve this ethical concern.

Accept/Reject Guidelines:
* Accept alternative valid ethical considerations if well-linked, such as informed consent (ensuring students knew they might be placed in a non-treatment group) or right to withdraw (ensuring no academic coercion since they are university students).
* Reject generic ethical descriptions that do not apply to the quantitative study described (e.g., deception, as there is no indication of deception in the stimulus).

In this study, researcher bias is a significant threat to internal validity. Because the researcher developed the MBCT app and stands to benefit financially from its commercial success, she has a clear conflict of interest. Conducting the pre- and post-intervention structured interviews herself while knowing which group each participant was assigned to (lack of blinding) creates a high risk of confirmation bias. She may unconsciously interpret participants' verbal or non-verbal responses more favorably or ask leading questions to elicit answers indicating reduced anxiety in the app group. Participant bias is also highly likely to affect the findings. Since participants volunteered via a flyer (self-selection), they represent a highly motivated sample who may expect to get better (expectancy/placebo effect). Furthermore, because they knew whether they were using the novel app or a simple reading guide, demand characteristics could occur. Participants in the app group might report greater anxiety reduction simply to please the researcher or because they expect a technological intervention to be superior. To minimize researcher bias, the study should employ a single-blind or double-blind procedure. An independent assessor, who is completely blind to the participants' group allocations and has no financial interest in the app, should conduct the interviews. To minimize participant bias, the researcher could implement an active control group (such as a generic educational app) rather than a simple reading guide, making it harder for participants to guess the experimental hypothesis. Lastly, replacing face-to-face interviews with standardized, self-administered online questionnaires (like the GAD-7) would remove interpersonal cues and interviewer effects entirely.

Marks are awarded based on the following criteria: Award 1 to 3 marks if the response shows limited understanding of researcher and participant bias, with little to no application to the stimulus, or merely defines the terms without connecting them to the scenario. Award 4 to 6 marks if the response identifies relevant sources of bias from the scenario (such as the researcher's financial interest, the lack of blinding during interviews, or self-selection) and suggests appropriate ways to minimize them (such as using independent researchers or blind designs), though the discussion may lack depth or detailed critical analysis. Award 7 to 9 marks if the response provides a well-structured, highly detailed discussion that clearly links researcher bias (conflict of interest, confirmation bias, lack of blinding) and participant bias (demand characteristics, expectancy effects, self-selection) to the specific details of the scenario. The suggestions for minimizing these biases (such as employing blind independent assessors, active controls, and self-administered questionnaires) must be realistic, highly appropriate, and thoroughly explained with clear evaluation of their benefits.