2025 Cambridge IAS-Level Psychology (9990) 模擬試題連答案詳解

Introduction: Ecological validity refers to the extent to which a study's findings can be applied to real-world settings, tasks (mundane realism), and situations. Both Andrade and Baron-Cohen et al. conducted laboratory experiments, which typically have lower ecological validity due to controlled and artificial environments. Strengths of Andrade (doodling): The primary strength regarding ecological validity is the high mundane realism of the task. Listening to a dull phone call and doodling while doing so is a common, everyday experience (e.g., during a lecture or administrative work). The telephone message was designed to sound realistic (recording a monologue about a party invitation), making the cognitive load task believable. Weaknesses of Andrade (doodling): The study took place in a quiet, controlled laboratory setting immediately after the participants had finished another experiment, which is not a natural setting. Furthermore, the doodling was highly structured (shading pre-printed shapes in a 1 cm diameter template), whereas natural doodling is free-flowing and self-directed. Strengths of Baron-Cohen et al. (eyes test): The stimuli used were photographs of real human eyes taken from popular magazines, which reflects actual human expressions and social cues. The complex mental states tested (such as 'arrogant' or 'reassuring') represent real social judgments made by adults daily. Weaknesses of Baron-Cohen et al. (eyes test): The eyes were static, black-and-white, and cropped to show only the eye region. In real life, we read emotions from dynamic, moving faces, and we benefit from additional contextual cues such as body language, tone of voice, and speech. Additionally, the forced-choice format with four printed words is highly artificial, as we do not choose from a list of options when interpreting emotions in natural social interactions. Comparison: Both studies suffer from low ecological validity due to the artificial laboratory settings which may elicit demand characteristics. However, Andrade's study achieves higher mundane realism because the physical task of listening and scribbling is virtually identical to its real-world counterpart. In contrast, Baron-Cohen's task is highly reductionist, breaking down complex human social interactions into static, visual snapshots, making its ecological validity lower than Andrade's.

Level 4 (10-12 marks): Both studies are thoroughly evaluated regarding ecological validity, addressing both strengths and weaknesses. Explicit and effective comparisons are made throughout the response. The definition of ecological validity is accurate, and detailed knowledge of both studies is shown. Level 3 (7-9 marks): The candidate describes the strengths and weaknesses of both studies regarding ecological validity, but the evaluation may be slightly unbalanced (e.g., stronger for one study). Some comparative points are made, though they may lack depth. Level 2 (4-6 marks): The response describes ecological validity in relation to one or both studies, but with limited detail or balance. Comparisons are weak, superficial, or presented as separate summaries. Level 1 (1-3 marks): The candidate makes a basic attempt to define ecological validity or describe a relevant feature of one study, showing minimal understanding and little to no comparison. Level 0 (0 marks): No creditworthy response.

### Model Essay Outline:

**Introduction**
Introduce the study by Hölzel et al. (2011), which investigated structural brain changes (specifically in gray matter concentration) associated with an 8-week Mindfulness-Based Stress Reduction (MBSR) course.

**Strength 1: Use of Objective Physiological Measures (Required Point)**
* **Point:** The study used Magnetic Resonance Imaging (MRI) to measure changes in gray matter concentration.
* **Explanation:** MRI scans provide highly objective, precise, and scientific quantitative data.
* **Application:** By scanning participants before and after the MBSR course, Hölzel et al. could physically measure increases in gray matter in areas like the hippocampus, temporoparietal junction, and cerebellum. This physiological measurement eliminates the threat of demand characteristics or response bias that typically affects psychological research relying solely on self-reports.

**Strength 2: Controlled Experimental Design**
* **Point:** The inclusion of a wait-list control group.
* **Explanation:** A control group allows researchers to isolate the independent variable (the mindfulness training) as the cause of changes in the dependent variable (brain structure).
* **Application:** The 17 control group participants did not undergo mindfulness training but were scanned at similar intervals. Comparing the MBSR group's changes to this control group helped rule out extraneous factors, such as the simple passage of time or repeated testing effects, increasing the internal validity of the study.

**Weakness 1: Sampling and Generalisability Issues**
* **Point:** Small, self-selected sample size.
* **Explanation:** Small samples are more susceptible to individual participant anomalies, making it difficult to generalise findings.
* **Application:** The experimental group only had 16 participants who completed the study. Furthermore, these individuals were highly motivated to participate in a mindfulness program (self-selected). Their brains or lifestyles might not represent the general public, limiting the external validity of the conclusions about mindfulness-induced brain plasticity.

**Weakness 2: Reliance on Self-Report Logs and Questionnaires**
* **Point:** Use of self-reported individual practice hours and the Five Facet Mindfulness Questionnaire (FFMQ).
* **Explanation:** Self-reports suffer from social desirability bias and subjective memory errors.
* **Application:** Participants kept individual logs of their daily practice at home (averaging 22.6 minutes per day). There is no objective way to verify if they actually practiced for this duration or if they practiced correctly. If participants overestimated their practice times due to social desirability, this could skew the correlations made with brain changes.

### Marking Scheme (Out of 10 Marks)

**Level 4 (8-10 marks):**
* Evaluation is detailed, balanced (showing both strengths and weaknesses), and well-structured.
* Explicitly and successfully addresses the named issue: the use of objective physiological measures.
* Maintains a strong focus on the study by Hölzel et al.
* Excellent use of psychological terminology and structured arguments.

**Level 3 (5-7 marks):**
* Evaluation is mostly balanced, offering at least one strength and one weakness in reasonable depth.
* Addresses the named issue (objective physiological measures) but may lack depth or clear application to the study.
* Mainly focuses on the study by Hölzel et al.
* Good use of psychological terminology.

**Level 2 (3-4 marks):**
* Evaluation is limited, perhaps focusing almost entirely on strengths or entirely on weaknesses.
* The named issue (objective physiological measures) is either omitted, extremely brief, or misunderstood.
* Shows basic knowledge of the Hölzel et al. study but lacks evaluative depth.

**Level 1 (1-2 marks):**
* Superficial discussion with generic points that could apply to almost any study.
* No mention or very poor understanding of the named issue.
* Fragmented or highly confused arguments.

**Level 0 (0 marks):**
* No response worthy of credit.

In an experimental design, the Independent Variable (IV) is the variable that the researcher manipulates to create different conditions, whereas the Dependent Variable (DV) is the variable measured to assess the effect of the IV. In Dr. Aris's study:
1. The IV is the auditory condition the participants are exposed to, which has two levels: listening to classical music versus sitting in silence.
2. The DV is the cognitive recall performance, operationalised as the total number of words correctly recalled from the standardized 20-word list.

1.4 marks: Clearly identifying and operationalising the Independent Variable (classical music vs. silence).
1.4 marks: Clearly identifying and operationalising the Dependent Variable (number of words recalled from the list).

The researchers controlled the speed of the message to maintain standardisation. By recording the mock telephone message at a steady rate of 110 words per minute, they ensured that every participant experienced the exact same auditory stimulus. This eliminated confounding variables like speech rate or sudden changes in pacing. Additionally, a monotonous speed of 110 words per minute is deliberately boring, which was essential to make the task tedious and test the effect of doodling on concentration.

1 mark: Correctly identifying the concept of standardisation or controlling for confounding variables (e.g., keeping task difficulty constant).
1.8 marks: Linking the explanation to the specific context of the study (e.g., ensuring the message was sufficiently boring/monotonous to induce daydreaming or test doodling/concentration).

1. Protection from harm: The participants (bystanders in the library) might experience immediate psychological distress, panic, or guilt for not helping. Since they did not volunteer for this stress, their psychological well-being is not protected.
2. Deception: The participants are actively deceived into believing a genuine medical crisis is happening when it is actually staged. They cannot give prior consent to this deception, violating their autonomy.

1.4 marks: Clear explanation of the violation of 'protection from harm' applied to the library scenario (e.g., anxiety, panic, or distress of witnessing a collapse).
1.4 marks: Clear explanation of the violation of 'deception' applied to the library scenario (e.g., misleading participants into believing it is a real emergency).

In training animals, a secondary (conditioned) reinforcer is a neutral stimulus that becomes reinforcing after being paired with a primary reinforcer. In Fagen et al., the handlers used a clicker. Initially, the clicker means nothing to the elephant. However, by sounding the clicker immediately before or during the delivery of a primary reward (like a banana), classical conditioning occurs. The elephant learns that the 'click' signals that a reward is coming, thus making the click sound itself reinforcing.

1 mark: Correctly identifying the secondary reinforcer as the clicker / click sound.
1.8 marks: Explaining the pairing process (classical conditioning) with a primary reinforcer (food/bananas) to establish its reinforcing properties.

Having a single observer increases the risk of observer bias, where the observer might interpret behaviors subjectively. Using two independent observers allows for the assessment of inter-rater reliability. To calculate this, the two observers would independently record behaviors during the same time period. Afterwards, their records are compared using a correlation test (such as Spearman's correlation coefficient) or by calculating percentage agreement (e.g., Cohen's Kappa). A high positive correlation coefficient (typically \( r \ge 0.80 \)) indicates strong inter-rater reliability, suggesting the observations are objective and consistent.

1 mark: Explaining the rationale for two observers (reducing individual observer bias, ensuring consistency/objectivity through inter-rater reliability).
1.8 marks: Describing how to calculate/assess it (comparing/correlating the two sets of scores and looking for a high positive correlation or high percentage agreement).

(a) To use a structured observation, Dr. Aris must define clear, operationalized behavioral categories to include on his checklist, such as 'Trainer offers food reward', 'Trainer uses verbal praise', 'Elephant executes target movement', and 'Elephant shows avoidance/distress'. An observer will tick the corresponding box whenever a behavior is seen. (b) The designed table must allow for time sampling (e.g., recording at 1-minute intervals). Columns: Time Interval (1 to 10 mins), Elephant Behavior Observed (Checklist categories), Trainer Action Observed. Rows represent each 1-minute interval. (c) Animal Ethics: The guideline of 'Pain and distress' is vital. Dr. Aris must ensure the positive reinforcement training does not involve any aversive stimuli, punishment, or deprivation that would cause psychological or physical distress to the young elephants.

Part (a): 1 mark for identifying behavior categories/checklist. 1 mark for operationalizing a specific elephant/trainer behavior. 1 mark for explaining the recording method (ticking during observation). Part (b): 1 mark for clear headings (intervals and behaviors). 1 mark for including a time-sampling structure (e.g., 1-minute increments up to 10 minutes). 1 mark for clear layout appropriate for data collection. Part (c): 1 mark for identifying a relevant animal ethical guideline (e.g., distress, reward/deprivation, species suitability). 1 mark for linking it directly to the sanctuary/elephant training scenario.

(a) A subjective scale ('Feelings Thermometer') can be operationalized with a clear range, such as 0 to 9, where 0 represents 'completely calm/no fear' and 9 represents 'the most fear possible'. The child is asked to rate their distress level verbally or by pointing to a visual representation of the thermometer during exposure. (b) The table should feature 5 rows (one for each mascot stimulus, e.g., Photo of Mascot, Toy Mascot, Mascot 10m away, Mascot 2m away, Hugging Mascot) and columns for the 3 sessions to record the numeric scores. (c) Strength of quantitative data: It allows for objective, numerical comparison over time. Michelle can easily calculate the difference in distress ratings between Session 1 and Session 3 to evaluate if the therapy is working.

Part (a): 1 mark for explaining the structure of the scale (e.g., 0-10 scale). 1 mark for operationalizing the end points (e.g., 0 = no fear, 10 = extreme fear). 1 mark for explaining how the child interacts with it (e.g., pointing or rating verbally during exposure). Part (b): 1 mark for listing 5 distinct, logical mascot-related stimuli. 1 mark for having 3 columns for successive therapy sessions. 1 mark for clear layout indicating 0-10 ratings. Part (c): 1 mark for identifying a strength of quantitative data (e.g., easy comparison, objective tracking). 1 mark for applying it to the child's phobia/therapy context.

(a) Independent Variable (IV): Whether the participant listens to low-fi background music or sits in silence. Dependent Variable (DV): The operationalized memory performance, measured as the score of correct details recalled from the mock telephone message. (b) The summary table requires columns for the two levels of the IV (Music, Silence) and columns/rows for descriptive statistics: Mean score and Standard Deviation. (c) Control of participant variables: Since some students naturally have better recall than others, Tarik could use a repeated measures design where everyone does both conditions. To prevent order effects, he must counterbalance (half do music first, half do silence first). Alternatively, he can randomly allocate a large sample to each group to distribute memory abilities evenly.

Part (a): 1 mark for identifying the IV. 1 mark for identifying the DV (specifically recall of details). Part (b): 1 mark for labeling the conditions (IV levels). 1 mark for including both 'Mean' and 'Standard Deviation' columns/rows. 1 mark for presenting a clean, logical summary table structure. Part (c): 1 mark for identifying a participant variable (e.g., baseline memory capability). 1 mark for explaining a control method (e.g., repeated measures, matched pairs, or random allocation). 1 mark for explaining how this control resolves the confound in this specific study.

(a) One-tailed directional hypothesis: 'As social anxiety scores increase, the preferred interpersonal distance (personal space) in centimeters chosen by the participant from a stranger will also increase.' (b) The raw data collection table must have columns for Participant ID (1 to 5), the measure of social anxiety (e.g., Score on a standardized social anxiety questionnaire), and the measure of personal space (e.g., Distance in centimeters from a stranger). It must display 5 rows for the participants. (c) Limitation: A correlation does not demonstrate causation. Chloe cannot conclude that social anxiety directly causes people to want more personal space. It is possible that a third factor, such as a history of negative social interactions or physiological arousal levels, causes both high anxiety and the preference for distance.

Part (a): 1 mark for a directional statement. 1 mark for operationalizing both variables (social anxiety score and physical distance). Part (b): 1 mark for showing space for 5 participants. 1 mark for clearly operationalizing the social anxiety variable (e.g., score on questionnaire). 1 mark for clearly operationalizing the personal space variable (e.g., distance in cm). 1 mark for overall layout suitable for a raw correlation data set. Part (c): 1 mark for stating that correlation does not equal causation (no cause-and-effect). 1 mark for explaining this limitation in the context of social anxiety and personal space (e.g., explaining a possible third variable).

Example response:

**Participant and Recruitment:**
The participant will be a 6-year-old female who has a severe phobia of balloons (globophobia), which interferes with her attending social events like birthday parties. She will be recruited using opportunity sampling from a specialized child psychology clinic where her parents had sought help. Written informed consent will be obtained from her parents, and verbal assent will be secured from the child.

**Qualitative Data Collection:**
Qualitative data will be collected through semi-structured interviews with the child and her mother at the start of the study, after each of the 6 therapy sessions, and at a 6-month follow-up. The therapist will record the child’s descriptions of her fears (e.g., "It feels like a monster that will pop in my face") and her mother’s observations of her behavior at home when encountering balloons. The therapist will also write detailed descriptive session notes on the child's coping progress.

**Quantitative Data Collection:**
Quantitative data will be gathered using a modified "Distress Thermometer" scale ranging from 0 (completely calm) to 10 (extremely terrified). The child will rate her distress at the beginning and end of each session. Additionally, the researcher will measure the physical distance (in centimeters) the child is willing to stand from an inflated balloon and record the duration (in seconds) she can hold an uninflated balloon.

**Ethical Issues (Protection from Harm):**
Because exposure therapy intentionally induces mild anxiety, protection from psychological harm is paramount. A strict distress protocol will be established: if the child's distress rating reaches 8 or higher, or if she exhibits signs of extreme panic (e.g., crying, trying to run away), the session will be paused immediately, the balloon will be removed from sight, and the therapist will guide her through deep-breathing exercises. The child's mother will be present in the room during all sessions to provide comfort and reassurance.

Marking Guidelines (Out of 10 marks total):

**1-4 marks:**
The design is basic, disorganized, or lacks necessary details for a case study. The student may have only addressed one of the required bullet points, or the proposed study reads like a group experiment rather than an in-depth case study of one individual. Ethical considerations or data collection methods are vague.

**5-7 marks:**
The design is appropriate and is clearly identifiable as a case study focusing on one individual. Most of the required bullet points (recruitment, qualitative/quantitative data, ethics) are addressed in moderate detail, though one area may be slightly underdeveloped. The data collection methods described are plausible but could be more specific.

**8-10 marks:**
The design is highly detailed, realistic, and excellently structured as a case study. All three required bullet points are fully and specifically addressed:
- **Participant/Recruitment:** Clearly defines a single child participant and details a realistic recruitment method (e.g., clinic referral/opportunity sample) with appropriate parental consent.
- **Qualitative/Quantitative data:** Provides clear, distinct, and highly practical methods for gathering both qualitative data (e.g., detailed interviews, therapist notes on thoughts/feelings) and quantitative data (e.g., distress rating scales, behavioral measurements of distance/time).
- **Ethics (Protection from harm):** Formulates a specific, practical distress-mitigation plan tailored to a child undergoing exposure therapy (e.g., clear stopping criteria, maternal presence, relaxation techniques).

Strength: An independent measures design avoids order effects (such as fatigue or boredom). In Dr. Lin's study, if participants listened to the boring message twice, they would likely become fatigued or experience a practice effect, which would confound the measurement of attention. Weakness: There is a potential for participant variables to affect the results. For example, participants in the doodling group might naturally have superior memory or attention spans compared to those in the non-doodling group, making it difficult to determine if doodling was the true cause of any differences.

For the strength: 1 mark for identifying/explaining a strength of independent measures (e.g., no order effects). 1 mark for linking this strength directly to Dr. Lin's study (e.g., participants do not get bored of listening to the message twice). For the weakness: 1 mark for identifying/explaining a weakness of independent measures (e.g., participant variables). 1 mark for linking this weakness directly to Dr. Lin's study (e.g., natural variations in participant memory/attention capacities across the two groups).