📚 Case Studies in Psychology: A Practical Drill | 心理学案例分析实战演练
Case studies are among the most powerful and vivid methods in psychological research, offering in-depth insight into rare phenomena, unique individuals, or small groups. In Edexcel Pre‑U Psychology, mastering the case study approach is essential not only for understanding theory but also for developing critical evaluation skills. This article provides a practical drill—guiding you through key features, classic examples, step‑by‑step analysis, and ethical debates—so you can confidently tackle any case study question that appears on your exam.
案例研究是心理学研究中最具感染力和生动性的方法之一，能够深入洞察罕见现象、独特个体或小群体。在 Edexcel Pre‑U 心理学课程中，掌握案例研究方法不仅有助于理解理论，也是培养批判性评价能力的关键。本文提供实战演练——引导你梳理案例研究的关键特征、经典范例、分步分析方法以及伦理争议——让你从容应对考试中出现的任何案例分析题。
1. What Is a Case Study? | 什么是案例研究？
A case study is an in‑depth, detailed investigation of a single person, group, or event. Unlike large‑scale surveys or experiments that seek generalisable patterns, a case study focuses intensively on one instance to uncover rich, qualitative data and sometimes quantitative measures. In psychology, case studies often involve individuals with rare conditions, brain injuries, or exceptional abilities, allowing researchers to explore phenomena that cannot be ethically or practically manipulated in a lab.
案例研究是对单一个体、群体或事件进行的深入、细致的调查。与追求可推广模式的大规模问卷或实验不同，案例研究集中聚焦于一个实例，以挖掘丰富的质性数据，有时也包含量化测量。在心理学中，案例研究常涉及具有罕见状况、脑损伤或特殊能力的个体，使研究者能够探索在实验室中伦理上或现实中无法操控的现象。
Case studies are idiographic; they aim to understand the unique constellation of factors shaping a particular case. This contrasts with the nomothetic approach, which looks for universal laws across many people. For the Pre‑U specification, you must recognise that case studies generate hypotheses and provide evidence that can complement—or challenge—nomothetic research.
案例研究是特殊性研究；它们旨在理解塑造某个特定案例的独特因素组合。这与寻找普遍法则的通则研究形成对比。在 Pre‑U 课程大纲中，你必须认识到案例研究能够生成假设，并提供可以补充——或挑战——通则研究的证据。
2. Key Features of Case Studies | 案例研究的关键特征
Several characteristics define the case study method. First, data are collected from multiple sources—interviews, observations, medical records, cognitive tests, diaries, and family accounts. This triangulation strengthens the validity of the findings. Second, the investigation is longitudinal: many famous case studies span years or even decades, detecting changes over time.
案例研究方法的特征有若干点。首先，数据通过多种来源收集——访谈、观察、医疗记录、认知测验、日记和家人叙述。这种三角互证增强了研究结果的信服度。其次，调查是纵向的：许多著名的案例研究持续数年甚至数十年，能够发现随时间推移的变化。
Third, case studies are often opportunistic—researchers take advantage of a naturally occurring situation that cannot be replicated, such as a unique brain lesion. Fourth, the data are primarily qualitative, resulting in thick descriptions that capture the participant’s lived experience. However, standardised tests may inject a quantitative element, as in memory scores or IQ measures.
第三，案例研究往往是机会性的——研究者利用自然发生且不可复制的状况，例如独一无二的脑损伤。第四，数据主要为质性数据，形成厚厚的描述，捕捉参与者的生活体验。不过，标准化测验也可能引入量化元素，如记忆分数或智商测量。
| Feature | 特征 |
| Multiple data sources | 多数据来源 |
| Longitudinal perspective | 纵向视角 |
| Opportunistic sampling | 机会性取样 |
| Qualitative richness | 质性丰富性 |
3. Classic Example: HM | 经典案例：HM
Henry Molaison, known as HM, lost the ability to form new long‑term memories after a surgery that removed parts of his medial temporal lobes, including the hippocampus. His case study, conducted by Brenda Milner and others from 1957 until his death in 2008, revolutionised our understanding of memory systems. HM could not remember events after the operation (anterograde amnesia), yet his short‑term memory and procedural memory remained intact.
亨利·莫莱森，人称 HM，在切除部分内侧颞叶（包括海马体）的手术后丧失了形成新长时记忆的能力。由布伦达·米尔纳等人自 1957 年直至他 2008 年去世期间开展的这项案例研究，彻底改变了我们对记忆系统的理解。HM 记不住术后发生的事件（顺行性遗忘），但他的短时记忆和程序性记忆却保持完好。
Through clever tasks, Milner demonstrated that HM could improve on a mirror‑drawing task despite having no conscious recollection of doing it before. This dissociation provided strong evidence for the distinction between declarative (explicit) and procedural (implicit) memory. The case remains a cornerstone of cognitive neuroscience, illustrating how a single case can illuminate brain–behaviour relationships.
通过巧妙的任务设计，米尔纳证明 HM 在镜像描画任务中表现越来越好，尽管他对自己之前做过该任务毫无有意识记忆。这种分离为陈述性（外显）记忆与程序性（内隐）记忆的区别提供了强有力的证据。这一案例仍是认知神经科学的基石，展示了单个案例如何能阐明脑与行为的关系。
4. Classic Example: Genie | 经典案例：吉妮
The case of Genie, a girl discovered in 1970 at the age of 13, who had been severely isolated and deprived of language, provided a tragic opportunity to study language acquisition. Researchers such as Curtiss (1977) documented her progress as she learned vocabulary but struggled with syntax and grammar—seemingly past a critical period for acquiring full linguistic competence.
吉妮案例：一位 1970 年被发现的 13 岁女孩，曾遭受严重隔离和语言剥夺，为研究语言习得提供了一个悲剧性的机会。柯蒂斯（1977）等研究者记录了她的进展，她学会了一些词汇，但在句法和语法上始终困难重重——似乎错过了习得全面语言能力的关键期。
Genie’s situation highlighted the ethical tightrope in case studies: researchers had to balance caregiving with scientific inquiry. Eventually questions were raised about whether the team exploited her for research. This shows that ethical scrutiny must accompany every phase of a case study, from initial assessment to long‑term follow‑up.
吉妮的处境凸显了案例研究中的伦理钢丝：研究者必须在照护与科学探索之间取得平衡。最终有人质疑团队是否利用她进行研究。这表明从初始评估到长期跟进，案例研究的每个阶段都必须伴随伦理审查。
5. Classic Example: Phineas Gage | 经典案例：菲尼亚斯·盖奇
In 1848, Phineas Gage survived an iron rod passing through his skull, destroying much of his frontal lobe. His personality transformed from responsible and sociable to impulsive and profane. This case, recorded by Dr John Harlow, offered the first real evidence that the frontal lobes regulate personality and social behaviour.
1848 年，菲尼亚斯·盖奇在一根铁棍穿过颅骨、破坏大部分额叶后奇迹生还。他的性格从负责、善于社交变得冲动、满口脏话。这一由约翰·哈洛医生记录的案例，首次提供了额叶调控人格和社会行为的真实证据。
Though details of Gage’s later life are debated, the case remains iconic. It illustrates a major strength of the method: revealing brain‑behaviour links that could never be studied experimentally. However, it also reveals a limitation—retrospective reports and second‑hand accounts may introduce bias, making it difficult to verify exactly how his personality changed.
尽管盖奇后来的生活细节存在争议，该案例仍是标志性的。它体现了案例研究法的一大优势：揭示脑与行为之间的联系，而这些联系绝不可能用实验方式研究。但也暴露了一个局限——回溯性报告和二手记录可能引入偏见，使人难以准确核实他的个性发生了怎样的变化。
6. Conducting a Case Study: Step‑by‑Step | 实施案例研究的步骤
When designing a case study, researchers follow a structured, though flexible, process. The first step is to identify a research aim and specify whether the case is chosen because of its uniqueness, typicality, or a critical theoretical test. Next, they obtain informed consent—or assent from guardians—and secure ethical approval, particularly important when working with vulnerable participants.
设计案例研究时，研究者遵循一个有结构但又灵活的过程。第一步是明确研究目的，并说明选择该案例是因为其独特性、典型性还是作为对理论的关键检验。接着，获得知情同意——或监护人的许可——并确保伦理审批，这在与脆弱参与者工作时尤其重要。
The third step is background data collection: medical history, family interviews, school records. Then the core data‑gathering phase begins, deploying multiple methods—structured interviews, psychometric tests, naturalistic observations, and sometimes neuroimaging. Throughout, the researcher maintains a detailed, dated log to create an audit trail. Finally, data are analysed for themes, patterns, and deviations, often with member checking where the participant helps verify interpretations.
第三步是背景资料收集：病史、家庭访谈、学校记录。然后进入核心数据采集阶段，部署多种方法——结构化访谈、心理测量测试、自然观察，有时还包括神经影像。整个过程中，研究者保持详细、标明日期的记录，以创建审计链条。最后，对数据进行分析，寻找主题、模式和偏离，通常还会进行成员检验，即让参与者帮助核实解释。
7. Analysing Case Study Data | 分析案例研究数据
Analysis combines inductive and deductive reasoning. Researchers start by reading through transcripts and notes to identify recurring codes—words, actions, emotions that appear frequently. These codes are then grouped into categories and finally into broader themes. For example, in a case study of a teenager with anxiety, codes like “avoidance of eye contact” and “shortness of breath” might merge into the theme “physiological and behavioural markers of social fear.”
分析结合了归纳推理和演绎推理。研究者首先反复阅读转录稿和笔记，识别反复出现的编码——频繁出现的词语、行为、情感。然后将这些编码归类，最后汇入更广泛的主题。例如，在一项关于焦虑青少年的案例研究中，“回避目光接触”和“呼吸急促”等编码可能汇入“社交恐惧的生理与行为标志”这一主题。
If quantitative data exist, descriptive statistics such as mean, range, or percentage change are calculated; inferential statistics are rarely appropriate for a single case. Triangulation is checked by comparing interview data with observational data and test scores. Any contradictions are noted, as they may reveal important complexity rather than simply being discarded as error.
如果存在量化数据，则计算描述性统计量，如平均数、范围或百分比变化；推断统计对于单个案例很少适用。通过比较访谈数据与观察数据及测验分数来检验三角互证。任何矛盾都会被记录下来，因为它们可能揭示重要的复杂性，而不是简单地作为错误被丢弃。
8. Evaluating Case Studies: Strengths | 评估案例研究：优势
One major strength is the depth of understanding. Case studies provide a level of detail unmatched by surveys or experiments, capturing the complexity of real human experience. This richness is invaluable for generating new hypotheses. For instance, HM’s case spawned decades of memory research that refined the multi‑store model and led to the distinction between episodic and semantic memory.
一个主要优势在于理解的深度。案例研究提供的细节水平是问卷或实验无法企及的，它捕捉了真实人类经验的复杂性。这种丰富性对于生成新假设是无价的。例如，HM 的案例催生了数十年的记忆研究，完善了多存储模型，并促成了情节记忆与语义记忆的区分。
Case studies also allow investigation of rare conditions, such as agnosia, amnesia, or severe deprivation, which would be impractical or unethical to study otherwise. They often lead to the development of therapeutic interventions tailored to the individual’s unique profile. The idiographic focus respects the person as a whole, not merely as a data point.
案例研究还可以调查罕见状况，如失认症、遗忘症或严重剥夺，这些在其他研究方式下既不现实也不合伦理。它们常常导向针对个体独特状况而制定的治疗干预。特殊性研究的焦点将人视为完整整体，而不仅仅是一个数据点。
9. Evaluating Case Studies: Limitations | 评估案例研究：局限性
Generalisability is the most frequently cited weakness. Because a case study deeply probes one individual, the findings may not apply to others. Even when cases share a condition, each person’s context is unique. Thus, any universal claim must be tested through wider correlational or experimental studies.
可推广性是最常被提及的弱点。因为案例研究深入探究单一个体，其发现可能不适用于其他人。即使多个案例共享同一状况，每个人的背景也是独特的。因此，任何普遍性论断都必须通过更广泛的相关或实验研究来检验。
Subjectivity and researcher bias are also concerns. The researcher often becomes closely involved with the participant over years, potentially losing objectivity. Confirmation bias can lead to selectively noting evidence that supports a pet theory while ignoring contradictory data. In addition, the retrospective element in many long‑standing cases relies on memory and records that may be incomplete or inaccurate.
主观性和研究者偏见也是担忧所在。研究者经年累月与参与者密切接触，可能丧失客观性。确认偏误可能导致研究者有选择地记录支持自己偏爱理论的证据，而忽略矛盾数据。此外，许多长期案例中的回溯性元素依赖于记忆和记录，而这些可能并不完整或准确。
10. Ethical Considerations | 伦理考量
Case studies often involve vulnerable individuals in sensitive circumstances, making ethical rigour paramount. A key principle is informed consent, but truly informed consent may be compromised when participants have cognitive impairments or are minors. In such cases, assent from legal guardians and ongoing assent from the participant must be secured.
案例研究常常涉及身处敏感境遇的脆弱个体，因此伦理严谨至关重要。一项关键原则是知情同意，但当参与者有认知障碍或是未成年人时，真正的知情同意可能难以实现。这种情况下，必须取得合法监护人的许可以及参与者的持续同意。
Confidentiality is critical; pseudonyms are standard, yet rich descriptions can make identification possible. Researchers must therefore judiciously alter non‑essential details. The right to withdraw must be highlighted, but in longitudinal studies the participant may forget this right or feel obliged to continue. Regular check‑ins about continued willingness are vital. Finally, a detailed debrief explaining the study’s purpose and offering support should be provided.
保密极为重要；使用化名是标准做法，然而丰富的描述仍可能让人识别出身份。因此研究者必须审慎地改动非必要细节。退出权必须被强调，但在纵向研究中，参与者可能忘记这项权利或感到有义务继续。定期确认其持续意愿至关重要。最后，应提供详细的解释说明，阐述研究目的并提供支持。
11. Comparison with Other Methods | 与其他研究方法的比较
In contrast to experiments, case studies lack controlled manipulation and random assignment, so causal conclusions are tentative. Experiments can demonstrate cause‑and‑effect through isolating independent variables, but they omit the lived texture that case studies capture. In a Pre‑U exam, you might be asked to discuss whether a case study could be followed up by an experiment to test an emerging hypothesis.
与实验相比，案例研究缺乏控制操纵和随机分配，因此因果结论是试探性的。实验可以通过隔离自变量来证明因果关系，但它们遗漏了案例研究所捕捉的生活质感。在 Pre‑U 考试中，你可能会被要求讨论：案例研究之后是否可以用实验来检验一个新兴假设。
Compared to questionnaires, case studies are far less economical and cannot easily reach large samples. However, questionnaires may impose the researcher’s categories, whereas case studies allow the participant’s own voice to emerge. Mixed‑method designs that combine a case study with a follow‑up survey can leverage the strengths of both.
与问卷相比，案例研究远不经济，且难以触及大样本。但问卷可能将研究者的分类强加于人，而案例研究则允许参与者自己的声音浮现出来。将案例研究与后续调查相结合的混合方法设计能够发挥二者之长。
12. Practical Drill: Analysing a Hypothetical Case | 实战演练：分析假设案例
Now try a sample exercise. Imagine a 37‑year‑old woman, “Sara,” who suffered a stroke in her left prefrontal cortex. She now appears emotionally flat and struggles to make even simple decisions, though her general intelligence is intact. Her family reports she used to be warm and decisive. You have access to interviews, cognitive tests, and a brain scan.
现在尝试一个样题练习。设想一位 37 岁女性“萨拉”，因左前额叶皮层中风受损。她现在情感淡漠，即使做简单决定也异常困难，但一般智力完好。家人反映她过去热情而果断。你可以使用访谈记录、认知测验和脑扫描结果。
Task: Analyse the case by answering the following prompts. First, identify the psychological construct likely affected—decision‑making and emotion regulation linked to the prefrontal cortex. Second, suggest two research methods already employed (interview, neuropsychological battery) and one additional method that would strengthen the study, maybe a daily decision‑log. Third, evaluate the strengths of this case study, such as capturing real‑world impact of prefrontal damage, and limitations, like single‑case uniqueness and potential researcher subjectivity. Finally, address two ethical safeguards: using pseudonyms and offering psychological support.
任务：通过回答以下提示来分析该案例。首先，识别可能受影响的心理构念——与前额叶皮层相关的决策与情绪调节。其次，指出已经使用的两种研究方法（访谈、神经心理成套测验）和另一项能增强研究的额外方法，也许可以加一份日常决策日志。第三，评价此案例研究的优势，如捕捉前额叶损伤的真实世界影响，以及局限，如单案例的独特性和潜在的研究者主观性。最后，说明两项伦理保障措施：使用化名和提供心理支持。
Write a short paragraph summarising your analysis. This drill mirrors the type of structured answer expected in Edexcel Pre‑U, integrating descriptive knowledge with critical thinking. Practising with real and hypothetical cases will sharpen your ability to swiftly identify relevant points under timed conditions.
写一段简短总结来概括你的分析。本次演练模拟了 Edexcel Pre‑U 所期望的结构化作答类型，将描述性知识与批判性思维融为一体。用真实和假设的案例进行练习，将提升你在限时条件下迅速识别相关要点的能力。
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