📚 Year 12 AQA Psychology: Case Study Practice | AQA心理学案例分析实战演练
In the AQA Psychology specification, case studies form a vital part of research methods and appear across topics such as memory, social influence, attachment, and psychopathology. This article is designed as a workshop to help Year 12 students develop the skills needed to analyse, evaluate, and write about case studies under exam conditions. By working through the explanation of key features, ethical issues, strengths and limitations, and engaging with worked examples and practice questions, you will build confidence in tackling any case-study-related question.
在AQA心理学课程中，案例研究是研究方法的重要组成部分，并出现在记忆、社会影响、依恋和心理病理学等各个主题中。本文旨在作为一个实战工作坊，帮助12年级学生培养在考试条件下分析、评价和撰写案例研究答案所需的技能。通过梳理案例研究的关键特征、伦理问题、优点和局限性，并结合实例分析与练习题目，你将更有信心应对任何与案例研究相关的问题。
1. What Is a Case Study? | 什么是案例研究？
A case study is an in-depth investigation of a single individual, small group, or event. It uses a range of methods such as interviews, observations, questionnaires, and psychological tests to gather rich, detailed qualitative data, though some quantitative data may also be collected. In AQA Psychology, case studies are often used to study unusual or rare phenomena that cannot be ethically or practically manipulated in an experiment.
案例研究是对单一个体、小群体或事件的深度调查。它使用访谈、观察、问卷和心理测验等一系列方法收集丰富、详细的质性数据，同时也可以收集一些量化数据。在AQA心理学中，案例研究常被用于研究那些在实验中出于伦理或实际操作原因无法操纵的不寻常或罕见现象。
Unlike experiments, case studies do not manipulate an independent variable; instead, they focus on describing and understanding the subject in its natural context. Examples include studies of brain-damaged patients like H.M., children raised in isolation like Genie, or a particular school dealing with bullying.
与实验不同，案例研究不操纵自变量；相反，它侧重于在自然情境中描述和理解研究对象。例子包括对脑损伤患者如H.M.、在孤立环境中长大的儿童如Genie，或者某个应对欺凌问题的特定学校的研究。
2. Key Features of a Case Study | 案例研究的主要特征
Case studies are characterised by their idiographic approach, meaning they focus on the unique and particular rather than attempting to establish general laws across populations. They are longitudinal in nature, often following the subject over a long period of time to observe development and change.
案例研究以特则性研究取向为特征，即关注独特与个别情况，而非试图建立适用于总体的普遍规律。它们在性质上是纵向的，通常会长时间追踪研究对象以观察发展与变化。
Data collection is multi-method: researchers may use unstructured interviews to gain the participant’s perspective, naturalistic observations to record behaviour in real settings, and psychometric tests to measure cognitive functions. This triangulation of methods strengthens the validity of the findings by providing several lines of evidence about the same individual or event.
数据收集是多方法的：研究者可能使用非结构化访谈获取被试的视角，使用自然观察记录真实环境中的行为，以及使用心理测量工具评估认知功能。这种方法的三角验证通过为同一个体或事件提供多条证据链，增强了研究结果的有效性。
3. Data Collection Techniques | 数据收集方法
The most prominent technique in case studies is the clinical interview, which allows researchers to explore the subject's thoughts, feelings, and history in depth. Questions are often open-ended and adapted to the respondent's answers, making the interview flexible but difficult to standardise.
案例研究中最突出的技术是临床访谈，它允许研究者深入探索被试的思想、情感和个人经历。问题通常是开放式的，并根据受访者的回答进行调整，这使得访谈灵活但难以标准化。
Naturalistic observation involves watching and recording behaviour in everyday settings, producing qualitative descriptions that capture the complexity of real life. Researchers may also analyse personal documents such as diaries, letters, or school reports to construct a detailed biography.
自然观察涉及在日常环境中观察并记录行为，形成捕捉现实生活复杂性的质性描述。研究者还可能分析个人文件，如日记、信件或学校报告，以构建详细的传记。
Quantitative measures, like IQ tests or questionnaires with Likert scales, can supplement the qualitative data, enabling some comparison with norms. However, the small sample size means any statistical analysis must be interpreted with extreme caution.
量化测量，如智商测验或李克特量表问卷，可以补充质性数据，使得与常模进行某些比较成为可能。然而，由于样本量极小，任何统计分析都必须极为谨慎地解读。
4. Sampling and Selection of Participants | 参与者的抽样与选择
Case studies typically use opportunity or purposive sampling because the participant is chosen for a specific, often unique, characteristic – such as having a rare brain injury or being a member of a particular cult. This is not a random sample, and therefore the participant is not representative of the wider population.
案例研究通常采用机会抽样或立意抽样，因为参与者是因为某个特定、通常是独特的特征而被选中的——例如患有罕见脑损伤或是某个特定邪教的成员。这不是随机样本，因此参与者不能代表更广泛的总体。
The selection is theory-driven; the researcher believes that studying this individual will illuminate a particular psychological phenomenon. For example, the case of Clive Wearing was selected to understand the nature of long-term memory because his extensive amnesia provided a window into how memory systems operate when one system is severely damaged.
这种选择是理论驱动的；研究者相信研究该个体将阐明某个特定的心理现象。例如，选择Clive Wearing的案例是为了理解长期记忆的本质，因为他广泛的失忆症为一个记忆系统严重受损时其他系统如何运作打开了一扇窗。
5. Ethical Considerations in Case Studies | 案例研究中的伦理考量
Ethical issues are particularly acute in case studies because of the deep personal involvement between researcher and participant. Informed consent can be problematic if the participant is a child, has a severe cognitive impairment, or is under institutional care. Researchers must ensure that guardians or legally authorised representatives provide valid consent.
由于研究者与参与者之间深度的个人关联，伦理问题在案例研究中尤为突出。如果参与者是儿童、患有严重认知障碍或处于机构看护中，知情同意可能会出现问题。研究者必须确保监护人或法定授权代表提供了有效的同意。
Confidentiality is paramount, yet the very nature of a detailed case history can make the individual identifiable. Researchers often change names, locations, and minor life details to protect the participant's identity, but this can sometimes clash with the goal of accurate historical record. Care must be taken to balance privacy with scientific transparency.
保密至关重要，然而详尽个案历史的本质可能使个体被识别。研究者通常会更改名字、地点和次要生活细节以保护参与者的身份，但这有时会与准确的历史记录目标相冲突。必须谨慎平衡隐私与科学透明性。
Psychological harm is another risk: probing into traumatic memories or observing distressing behaviour can cause the participant emotional upset. Researchers must provide appropriate support, debriefing, and the right to withdraw data at any stage.
心理伤害是另一个风险：深入探查创伤记忆或观察痛苦行为可能导致参与者情绪不安。研究者必须提供适当的支持、事后解说，并在任何阶段都可撤回数据的权利。
6. Strengths of Case Studies | 案例研究的优点
Case studies provide exceptionally rich, detailed data that capture the complexity of human experience. This depth of understanding can generate new hypotheses for future experimental research. Freud's case study of Little Hans, for instance, contributed to the development of his psychoanalytic theory of phobias.
案例研究提供了异常丰富、详细的数据，能够捕捉人类经验的复杂性。这种深度理解能为未来的实验研究产生新的假设。例如，弗洛伊德对小汉斯的案例研究为其恐惧症的精神分析理论的发展做出了贡献。
They allow the study of behaviours or conditions that are so rare that controlled experiments would be impossible. The case of Genie, a girl who suffered extreme deprivation, gave psychologists invaluable insight into the sensitive period for language acquisition – something that could never be experimentally replicated for ethical reasons.
它们允许研究那些极为罕见、以至于无法进行控制实验的行为或状况。Genie案例中的女孩经历了极度剥夺，为心理学家提供了语言习得关键期的宝贵洞见——出于伦理原因，这绝不可能通过实验复制。
Triangulation of data from multiple sources enhances the credibility and internal validity of the conclusions. When interviews, observations, and test scores all point in the same direction, confidence in the interpretation grows.
来自多种来源的数据三角验证增强了结论的可信度和内部效度。当访谈、观察和测验分数都指向同一方向时，解释的可信度便随之增强。
7. Limitations of Case Studies | 案例研究的局限性
The findings from a single case cannot be easily generalised to other people or situations. The unique characteristics of the participant – their personality, background, and specific circumstances – mean that what holds true for them may not apply to the wider population. This makes the approach weak in population validity.
单一案例的研究结果难以推广到其他人或情境。参与者的独特特征——他们的性格、背景和具体情境——意味着在他们身上成立的结论可能不适用于更广泛的总体。这使得该方法在人口效度上较弱。
Researcher bias is a serious concern. Because the researcher often works closely with the participant for a long period, their own expectations and interpretations can colour the data collection and analysis. In Freud's case studies, for example, many critics argue that he selectively recorded evidence that confirmed his theories while ignoring contradictory information.
研究者偏见是一个严重的问题。因为研究者常常长时间与被试密切工作，他们自身的期望和解释可能会影响数据的收集与分析。例如，在弗洛伊德的案例研究中，许多批评者认为他有选择性地记录证实其理论的证据，而忽略了矛盾的信息。
Reliability can be low because case studies are difficult to replicate. They describe a particular person at a particular time under unique historical and cultural circumstances. A different researcher might ask different questions, observe different behaviours, or interpret the same data set in a different way.
信度可能较低，因为案例研究难以重复。它们描述的是特定历史和文化环境下特定时间内的特定个人。不同的研究者可能会提出不同的问题、观察到不同的行为，或以不同的方式解释相同的数据集。
8. Analysing a Case Study: A Step-by-Step Guide | 分析案例：步骤指南
Step 1 – Identify the aim: What was the researcher trying to find out? Look for statements about investigating a rare condition, exploring a unique event, or understanding a phenomenon in depth.
第一步——确定目的：研究者试图发现什么？寻找关于调查罕见状况、探索独特事件或深入理解某个现象的陈述。
Step 2 – Describe the participant/event: Note key characteristics such as age, gender, diagnosis, and background that make this case noteworthy. Explain why this participant was selected (purposive sampling).
第二步——描述参与者/事件：注意关键的年龄、性别、诊断和背景等特征，使该案例引人注目。解释为什么选择这名参与者（立意抽样）。
Step 3 – List the methods used: Identify the specific data collection techniques mentioned, e.g., clinical interviews, cognitive tests, family observations. Evaluate the usefulness of each method for gathering rich data.
第三步——列出使用的方法：识别提到的具体数据收集技术，例如临床访谈、认知测验、家庭观察。评价每种方法在获取丰富数据方面的作用。
Step 4 – Evaluate ethical issues: Discuss informed consent, confidentiality, potential psychological harm, and how the researcher attempted (or failed) to address them.
第四步——评价伦理问题：讨论知情同意、保密、潜在心理伤害，以及研究者如何试图（或未能）解决这些问题。
Step 5 – Assess strengths and limitations: Write a balanced paragraph on the depth of data vs generalisability, the role of researcher bias, and the reliability of the conclusions.
第五步——评估优点和局限性：就数据深度与可推广性、研究者偏见的作用以及结论的信度，撰写一段平衡的评述。
9. Worked Example 1: Memory – The Case of H.M. | 实例分析1：记忆——H.M.案例
Henry Molaison, known in the literature as H.M., suffered from severe epilepsy. In 1953, surgeons removed parts of his medial temporal lobe, including the hippocampus. After the surgery, H.M. was unable to form new long-term memories (anterograde amnesia), although his intelligence and short-term memory remained intact.
Henry Molaison，在文献中称为H.M.，患有严重癫痫。1953年，外科医生切除了他包括海马体在内的部分内侧颞叶。手术后，H.M.无法形成新的长期记忆（顺行性遗忘症），尽管他的智力和短期记忆保持完好。
Researchers studied H.M. for more than fifty years using a variety of methods: standardised memory tests, clinical interviews, and later MRI scans. This case study revolutionised our understanding of memory by showing that different memory systems (e.g., episodic, semantic, procedural) are located in separate brain regions.
研究者使用多种方法对H.M.进行了长达五十多年的研究：标准化记忆测验、临床访谈以及后来的MRI扫描。这一案例研究通过显示不同记忆系统（如情节、语义和程序性记忆）位于不同脑区，彻底改变了我们对记忆的理解。
Applying the analytical steps: The aim was to explore the role of the medial temporal lobe in memory. The participant was selected purposively because of his unique brain damage. Methods included neuropsychological tests and brain imaging. Ethically, H.M.'s identity was kept confidential during his lifetime, and consent was obtained from his legal guardians. The strength lies in the immense depth of data across decades; the limitation is that H.M.'s brain damage was irreversible and individual, making generalisation to all memory function tentative.
应用分析步骤：目的是探索内侧颞叶在记忆中的作用。因独特的脑损伤，被试被立意选出。方法包括神经心理测验和脑成像。伦理上，H.M.生前身份保密，并得到了法定监护人的同意。优点在于跨越数十年的数据深度；局限性在于H.M.的脑损伤是不可逆且个别的，使得推广到所有记忆功能需谨慎。
10. Worked Example 2: Social Influence – The Case of Kitty Genovese | 实例分析2：社会影响——Kitty Genovese案例
In 1964, Kitty Genovese was murdered near her apartment in New York while 38 witnesses reportedly did nothing. This tragic event became a famous case study in social psychology, leading to research on the bystander effect and diffusion of responsibility.
1964年，Kitty Genovese在纽约其公寓附近被杀害，据报道有38位目击者无所作为。这一悲剧事件成为社会心理学中一个著名的案例研究，引发了对旁观者效应和责任分散的研究。
Researchers analysed police reports, newspaper accounts, and retrospective interviews with neighbours. The case highlighted how the presence of multiple onlookers can inhibit helping behaviour because each individual assumes someone else will intervene. It is a powerful example of situational factors overriding personal responsibility.
研究者分析了警方报告、报纸记述以及对邻居的回溯性访谈。该案例突显了多名旁观者的存在如何抑制助人行为，因为每个人都认为别人会介入。这是一个情境因素压倒个人责任的有力例证。
From a methods perspective, the study relied on secondary data, which meant researchers could not control the accuracy of initial testimonies. Ethically, the neighbours were criticised for their inaction, and extensive media coverage led to further distress. While the case produced rich, real-world insights into obedience and social norms, the lack of scientific control and the retrospective nature of data collection limit the reliability of causal claims.
从方法角度看，该研究依赖二手数据，意味着研究者无法控制最初证词的准确性。伦理上，邻居们因不作为而受到批评，广泛的媒体报道导致了进一步的困扰。尽管该案例产生了对服从和社会规范的丰富现实洞见，但缺乏科学控制以及数据收集的回溯性质，限制了因果断言的信度。
11. Common Exam Questions and Mark Schemes | 常见考题与评分标准
Exam questions on case studies often ask you to 'Outline one strength and one limitation of using case studies in psychological research.' A strong answer will name a specific example, explain it fully, and link it to a research method concept such as ecological validity or researcher bias. For instance, a strength could be: 'Case studies like H.M. provide detailed qualitative data that reveal the complexity of brain-behaviour relationships, which experiments cannot easily capture,' and a limitation could be: 'However, the findings are unique to one individual and cannot be generalised, reducing population validity.'
关于案例研究的考题经常要求你"概述在心理学研究中使用案例研究的一个优点和一个局限性"。一个有力的答案要列举具体例子，充分解释，并将其与研究方法的某个概念（如生态效度或研究者偏见）联系起来。例如，优点可以是："像H.M.这样的案例研究提供了揭示脑-行为关系复杂性的详细质性数据，这是实验不易捕捉的"，局限性可以是："然而，这些发现对单一个体是独特的，无法推广，降低了人口效度。"
You may also be given a short scenario describing a psychologist conducting a case study and asked to discuss ethical issues or suggest how a specific problem could be dealt with. Make sure you use appropriate terms – confidentiality, informed consent, protection from harm – and suggest realistic strategies, not vague promises.
你还可能遇到一个简短的情境，描述心理学家开展案例研究，要求你讨论伦理问题或建议如何处理某个具体问题。务必使用恰当的术语——保密、知情同意、免受伤害——并提出切实的策略，而非空泛的承诺。
Additionally, questions can require you to 'Explain how the researcher could improve the validity of the case study.' Here you could suggest triangulating methods, using inter-rater reliability checks on observations, or involving a second interviewer to reduce bias.
此外，问题可能要求你"解释研究者如何提高案例研究的效度"。这时你可以建议方法三角验证、对观察使用评分者间信度检查，或让第二位访谈者参与以减少偏见。
12. Practice Case Study with Model Answers | 实战练习与参考答案
Scenario: A psychologist wanted to investigate the impact of starting secondary school on a 12‑year‑old girl with a diagnosed social anxiety disorder. Over one academic year, the psychologist conducted monthly in‑depth interviews with the girl, observed her in the school playground during lunch breaks, and asked her teachers to complete a weekly behaviour checklist.
情境：一位心理学家想调查升入中学对一名被诊断患有社交焦虑症的12岁女孩的影响。在一个学年中，心理学家每月对该女孩进行深度访谈，在午休时间观察她在学校操场上的行为，并让老师每周填写一份行为核查表。
Practice question 1: Identify one ethical issue that could arise in this case study and explain how the psychologist could address it. (4 marks)
练习题1：指出该案例研究中可能产生的一个伦理问题，并解释心理学家如何解决它。（4分）
Model Answer: One ethical issue is the risk of psychological harm from repeatedly discussing anxious thoughts during interviews. The psychologist could address this by reminding the girl that she can skip any question she finds upsetting and can withdraw from the study at any time without consequence. Regular check‑ins with a school counsellor could also be arranged.
参考答案：一个伦理问题是在访谈中反复讨论焦虑想法可能导致心理伤害。心理学家可以提醒女孩她可以跳过任何令她难过的问题，并可随时退出研究而无需承担任何后果。还可以安排定期与学校心理咨询师沟通。
Practice question 2: Outline one strength and one limitation of the data collection methods used in this study. (4 marks)
练习题2：概述该研究中使用的一种数据收集方法的一个优点和一个局限性。（4分）
Model Answer: A strength of using in‑depth interviews is that they can provide rich, detailed qualitative data about the girl's personal experiences and feelings, which gives a deep understanding of her social anxiety. A limitation is that interviews rely on self‑report, and the girl may have given socially desirable answers rather than telling the full truth, which lowers the validity of the data.
参考答案：使用深度访谈的一个优点是能提供关于女孩个人经历和情感的丰富详细的质性数据，从而深入了解她的社交焦虑。一个局限性是访谈依赖自我报告，女孩可能提供了符合社会期望的回答而非完全属实，这降低了数据的效度。
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