📚 Case Study Practice: Real-World Applications in Psychology | 案例分析实战演练
Case studies are a powerful tool in psychology. They allow researchers to explore behaviour, thoughts and feelings in depth within real-life contexts. In this article, we will work through several case studies to practise important skills: identifying variables, forming hypotheses, considering ethics, and applying psychological explanations. This hands-on approach will help you think like a psychologist and prepare for WJEC KS3 assessments.
案例研究是心理学中一个强有力的工具。它们让研究者能够在真实生活情境中深入探索行为、思维和情感。在本文中，我们将通过几个案例来练习重要技能：识别变量、形成假设、考虑伦理，并运用心理学解释。这种实践方法将帮助你像心理学家一样思考，并为 WJEC KS3 测评做好准备。
1. What Is a Case Study? | 什么是案例研究？
A case study is an in-depth investigation of a single person, group or event. It often uses interviews, observations and questionnaires to gather rich, detailed data. Unlike large-scale experiments, a case study focuses on the unique qualities of the individual or situation, but it can still help us understand general principles of behaviour.
案例研究是对单个个体、群体或事件进行的深入调查。它通常使用访谈、观察和问卷来收集丰富而详细的数据。与大规模实验不同，案例研究关注个体或情境的独特品质，但它仍然可以帮助我们理解行为的一般原理。
In WJEC KS3 Psychology, you need to be able to recognise the strengths and weaknesses of case studies. Strengths include providing high ecological validity and giving a complete picture of a person’s life. Weaknesses include difficulty generalising findings and risk of researcher bias.
在 WJEC KS3 心理学中，你需要能够识别案例研究的优点和缺点。优点包括提供高生态效度，并给出一个人生活的完整画面。缺点包括难以将发现普遍化，以及存在研究者偏见的风险。
Whenever you read a case study, ask yourself: ‘What is the main question being asked? What methods were used? Are there any ethical concerns?’
每当你阅读一个案例研究时，问自己：“正在探讨的主要问题是什么？使用了哪些方法？是否存在伦理问题？”
2. Key Skills: Variables and Hypotheses | 关键技能：变量与假设
Before analysing a case, you must be able to identify variables. An independent variable (IV) is the factor that changes or is manipulated. A dependent variable (DV) is the factor that is measured. In a case study, these may not be as clearly controlled as in an experiment, but you can still think about what influences what.
在分析案例之前，你必须能够识别变量。自变量 (IV) 是改变或被操纵的因素。因变量 (DV) 是被测量的因素。在案例研究中，这些变量可能不像实验那样被清晰地控制，但你仍然可以思考是什么影响了什么。
A hypothesis is a clear, testable prediction. For example: ‘Individuals who experience a frightening event will develop a phobia more often than those who do not.’ A good hypothesis mentions both the IV and the DV and is written in a precise way.
假设是一个清晰、可检验的预测。例如：“经历过恐惧事件的人比没有经历过的人更容易发展出恐惧症。”一个好的假设要同时提到 IV 和 DV，并以精确的方式表达。
Practice rewriting vague ideas as operationalised hypotheses. Instead of ‘memory gets worse’, say ‘Participants will recall fewer words from a list after a 30-minute delay than immediately after hearing the list.’
练习将模糊的想法改写为可操作的假设。不要说“记忆变差”，而要说“参与者在听到单词列表 30 分钟后回忆起的单词数量，将少于听完后立即回忆的数量”。
3. Ethical Considerations in Case Studies | 案例研究中的伦理考量
All psychological research must follow ethical guidelines. In the UK, the British Psychological Society (BPS) sets these rules. For case studies, you should consider: informed consent, right to withdraw, confidentiality, protection from harm, and debriefing.
所有心理学研究都必须遵循伦理准则。在英国，英国心理学会 (BPS) 制定了这些规则。对于案例研究，你应该考虑：知情同意、退出权、保密性、免受伤害以及事后解释。
Imagine a study of a child with a rare memory condition. The researcher must gain consent from the parents, keep the child’s identity secret, and ensure the procedures do not cause distress. If the child becomes upset, the study must stop immediately.
想象一项针对一名患有罕见记忆状况的儿童的研究。研究者必须征得家长的同意，对孩子的身份保密，并确保研究程序不会引起痛苦。如果孩子感到不安，研究必须立即停止。
Think about classic case studies such as Little Albert or Genie. Were the ethical standards of today met? Critically evaluating ethics is a key skill in WJEC psychology.
想一想小阿尔伯特或吉妮等经典案例研究。它们是否符合今天的伦理标准？批判性地评估伦理是 WJEC 心理学中的一项关键技能。
4. Case Study 1: Alex’s Dog Phobia | 案例 1：亚历克斯的犬类恐惧症
Alex is a 12-year-old boy who has developed an intense fear of dogs. He refuses to walk in the park and trembles when he hears a bark. Two years ago, a large dog knocked him over while barking loudly. Since that incident, his fear has grown. He has no bad experiences with any other animals.
亚历克斯是一名 12 岁的男孩，他对狗产生了强烈的恐惧。他拒绝在公园散步，一听到狗叫就会发抖。两年前，一只大狗一边大声吠叫一边把他撞倒了。从那以后，他的恐惧与日俱增。他没有与其他动物有过任何不愉快的经历。
When you read a case like this, try to identify the unconditioned stimulus (UCS), unconditioned response (UCR), neutral stimulus (NS), conditioned stimulus (CS) and conditioned response (CR) from classical conditioning theory.
当你阅读这样的案例时，尝试根据经典条件作用理论找出非条件刺激 (UCS)、非条件反应 (UCR)、中性刺激 (NS)、条件刺激 (CS) 和条件反应 (CR)。
In Alex’s case, the loud barking and being knocked over (UCS) naturally caused fear and pain (UCR). The dog, originally a neutral stimulus, became associated with the frightening event. Now, the sight or sound of any dog (CS) triggers a fear response (CR).
在亚历克斯的案例中，大声吠叫和被撞倒 (UCS) 自然地引起了恐惧和疼痛 (UCR)。狗最初是一个中性刺激，后来与恐惧事件建立了联系。现在，看到或听到任何狗 (CS) 都会引发恐惧反应 (CR)。
5. Explaining Alex’s Behaviour | 解释亚历克斯的行为
This explanation uses the work of Ivan Pavlov and later John Watson, who showed that emotional responses can be learned through association. Alex’s phobia is a learned behaviour, not something he was born with. This is an example of environmental influence on behaviour.
这一解释运用了伊万·巴甫洛夫以及后来约翰·华生的研究，他们表明情绪反应可以通过联想而习得。亚历克斯的恐惧症是一种习得行为，而不是他与生俱来的。这是环境影响行为的一个例子。
A psychologist might design a treatment plan based on counter-conditioning or systematic desensitisation. For instance, Alex could be gradually exposed to a calm dog from a distance while practising relaxation techniques. The CS would eventually stop triggering the CR.
一位心理学家可能会设计一个基于反条件作用或系统脱敏的治疗方案。例如，亚历克斯可以在练习放松技巧的同时，从远处逐渐接触一只安静的狗。最终，CS 将停止引发 CR。
Critically, this case study does have limitations. It is based on memory recall — Alex and his parents may not remember all details accurately. Also, one event is not the whole story; other factors like personality may play a part. However, the classical conditioning model provides a useful framework.
批判性地来看，这个案例研究确实有其局限性。它基于记忆回忆——亚历克斯和他的父母可能无法准确记住所有细节。此外，一个事件并不能代表全部；人格等其他因素可能也起了作用。不过，经典条件作用模型提供了一个有用的框架。
6. Case Study 2: The Unreliable Witness | 案例 2：不可靠的目击者
Mia witnessed a heated argument between two classmates outside the school library. When interviewed by a teacher the next day, she was asked: ‘How fast was the older boy running when he pushed the other one?’ Later, when asked to describe the event freely, Mia added details about running that she had not actually seen. Her memory seemed to have changed.
米娅目睹了两个同学在学校图书馆外发生的激烈争吵。第二天老师找她谈话时，问她：“那个大一点的男孩推另一个男孩时跑得有多快？”后来，当她被要求自由描述事件时，米娅添加了她实际上并没有看到的有关跑步的细节。她的记忆似乎发生了改变。
This case study allows us to explore the effect of leading questions and post-event information on memory. The teacher’s question assumed there was running and pushing, even if these details were uncertain. This can alter a witness’s recollection, a phenomenon studied by Elizabeth Loftus.
这个案例研究使我们能够探讨引导性问题和事后信息对记忆的影响。老师的问题假定存在跑步和推搡行为，即使这些细节并不确定。这可能会改变目击者的回忆，这是伊丽莎白·洛夫特斯研究过的一种现象。
According to research on reconstructive memory, our memories are not like video recordings. Each time we recall an event, we reconstruct it using fragments of the original experience plus our existing knowledge, called schemas. Mia’s schema for ‘a fight’ might include running, so her brain filled in the gap.
根据记忆重构的研究，我们的记忆并不像录像。每次我们回忆事件时，都会使用原始经验的碎片加上我们已有的知识（即图式）来重构它。米娅关于“打架”的图式可能包含奔跑，所以她的大脑填补了这个空白。
7. Implications of Unreliable Memory | 不可靠记忆的影响
Understanding this case can help students appreciate why police and courts use careful interviewing techniques. The cognitive interview, for example, encourages witnesses to mentally reinstate the context and report everything without interruption. It avoids leading questions to protect the accuracy of testimony.
理解这个案例可以帮助学生认识到为什么警察和法庭要使用谨慎的访谈技术。例如，认知访谈鼓励目击者在脑中恢复情境并毫无中断地报告所有内容。它避免引导性问题，以保护证词的准确性。
This case also highlights a key debate in psychology: are human beings passive recorders or active constructors of reality? The evidence from memory research suggests we are active constructors, which has huge implications for everyday life, from classroom learning to eyewitness justice.
这个案例还突显了心理学中的一个关键争论：人类是被动的记录者，还是现实的主动建构者？记忆研究的证据表明，我们是主动的建构者，这对日常生活有着巨大的影响，从课堂学习到目击者司法。
When evaluating this case study, you might argue that it lacks control over extraneous variables. Mia could have been distracted, stressed, or influenced by other peers before the interview. Nevertheless, it vividly illustrates the malleability of memory.
在评估这个案例研究时，你可能会说它缺乏对额外变量的控制。米娅在接受访谈之前可能分心了、感到压力大，或者受到了其他同伴的影响。尽管如此，它生动地说明了记忆的可塑性。
8. Case Study 3: Conformity in the Classroom | 案例 3：教室中的从众行为
Mr. Evans, a KS3 teacher, noticed something peculiar. Whenever he asked his class a difficult maths question, most students looked at the most popular pupil, Sam, before raising their hands. If Sam didn’t raise his hand, only one or two others did. One day, Mr. Evans secretly gave Sam the wrong answer beforehand. When Sam confidently gave that incorrect answer, over two-thirds of the class agreed with him, even though some later admitted they had known the right answer.
埃文斯老师是一名 KS3 教师，他注意到一件奇特的事。每当他向全班提出一个困难的数学问题时，大多数学生都会先看最受欢迎的学生山姆，然后再举手。如果山姆不举手，就只有一两个人举手。有一天，埃文斯老师事先偷偷地给了山姆一个错误答案。当山姆自信地给出那个错误答案时，超过三分之二的同学都同意他，尽管有些人后来承认他们原本知道正确的答案。
This scenario demonstrates conformity, a type of social influence where individuals change their behaviour or beliefs to fit in with a group. Solomon Asch’s classic line-judgement experiment showed similar results: people often go along with the majority even when the majority is clearly wrong.
这个情景展示了从众行为，一种个体为了融入群体而改变自己行为或信念的社会影响类型。所罗门·阿希经典的线条判断实验显示了类似的结果：即使多数人明显是错误的，人们也常常随大流。
The two main reasons for conformity are normative social influence (wanting to be liked and accepted) and informational social influence (believing the group knows better). In the classroom, both might be at play. Students wanted to be accepted by Sam’s group and also assumed Sam must be right.
从众的两个主要原因是规范社会影响（希望被喜欢和接受）和信息社会影响（认为群体更了解情况）。在教室里，这两种影响都可能存在。学生们希望被山姆所在的群体接纳，同时也认为山姆肯定是对的。
9. Analysing Conformity Variables | 分析从众变量
We can identify variables even in a naturalistic observation like this. The independent variable could be Sam’s behaviour (answering correctly vs. giving a wrong answer). The dependent variable would be the number of students conforming to his answer. Possible extraneous variables include the difficulty of the question, students’ confidence in maths, and the seating arrangement.
即使在这样的自然观察中，我们也能识别变量。自变量可以是山姆的行为（正确回答 vs. 给出错误答案）。因变量将是顺从他答案的学生人数。可能的额外变量包括问题的难度、学生对数学的自信程度以及座位安排。
Ethically, was Mr. Evans’s deception acceptable? He did not inform the class about the fake wrong answer, so there was no informed consent. However, if no harm was caused and a full debriefing followed, this might be seen as a minor ethical risk that brought valuable insight into social dynamics.
从伦理角度看，埃文斯老师的欺骗行为是否可接受？他没有告知全班那个虚假的错误答案，因此没有获得知情同意。不过，如果没有造成任何伤害，并且随后进行了充分的解释，这或许可以被视为一个带来宝贵社会动态洞见的轻微伦理风险。
This case study also lets us discuss individual differences. Not everyone conformed; some students resisted the group pressure. What factors might have helped them? Perhaps high self-esteem, a strong personal code, or simply sitting far from Sam. Real-world applications include understanding peer pressure and bullying.
这个案例研究还让我们讨论个体差异。并不是每个人都从众了；一些学生抵制了群体压力。哪些因素可能帮助了他们？也许是高自尊、强烈的个人准则，或者仅仅是坐在离山姆较远的地方。现实应用包括理解同伴压力和欺凌行为。
10. Designing Your Own Case Study | 设计你自己的案例研究
Now it is your turn. Choose a psychological topic, such as sleep, social media use, or stress. Create a brief case study of a fictional person facing an issue related to that topic. Your case study should describe the person, the situation, and the behaviour of interest in enough detail for analysis.
现在轮到你了。选择一个心理学主题，如睡眠、社交媒体使用或压力。创建一个虚构人物面临与该主题相关问题的简短案例研究。你的案例研究应描述该人物、情境以及感兴趣的行为，并包含足够细节供分析使用。
Then, write a plan: state a possible hypothesis, identify the main variables, and suggest how you could collect additional data ethically. For instance, if your case is about a teenager who sleeps poorly after using a phone before bed, your hypothesis could be: ‘Using a smartphone for social media in the hour before bedtime will reduce total sleep duration.’
然后，写一份计划：陈述一个可能的假设，识别主要变量，并建议如何合乎伦理地收集额外数据。例如，如果你的案例是关于一名青少年在睡前使用手机后睡不好觉，你的假设可以是：“在睡前一小时使用智能手机浏览社交媒体将减少总睡眠时长。”
Always think about practicalities and ethics. Would you use a sleep diary, a questionnaire, or an interview? How would you obtain consent from the teenager and the parents? What would you do if the participant became distressed?
始终要考虑实用性和伦理问题。你会使用睡眠日记、问卷还是访谈？你将如何获得青少年及其家长的同意？如果参与者感到痛苦，你会怎么做？
11. Key Terms for Case Study Analysis | 案例分析关键术语
Here is a quick glossary to help you think and write like a psychologist. Review these terms regularly and try to use them in your own explanations.
这里有一个快速术语表，帮助你像心理学家一样思考和写作。定期复习这些术语，并尝试在你自己的解释中使用它们。
- Ecological validity – The extent to which findings reflect real-life settings. / 生态效度 – 研究发现反映真实生活情境的程度。
- Operationalisation – Clearly defining variables so they can be measured. / 操作性定义 – 清晰定义变量以便进行测量。
- Schema – A mental framework of beliefs and expectations that influences how we process information. / 图式 – 一种影响我们信息处理方式的信念和期望的心理框架。
- Normative social influence – Conforming to be liked or accepted. / 规范社会影响 – 为了被喜爱或接纳而从众。
- Informational social influence – Conforming because we believe others are correct. / 信息社会影响 – 因为我们相信他人正确而从众。
- Reconstructive memory – The idea that memory is rebuilt each time we recall it, rather than replayed perfectly. / 记忆重构 – 认为记忆在每次回忆时被重建而非完美回放的观点。
12. Summary and Exam Tips | 总结与考试技巧
Through these case studies, you have practised identifying variables, linking observations to psychological theories, evaluating ethics, and designing a simple investigation. These are the building blocks of psychological enquiry. Remember that there is often no single ‘right’ answer — what matters is how well you support your argument with evidence and logical reasoning.
通过这些案例研究，你练习了识别变量、将观察与心理学理论联系起来、评估伦理以及设计一个简单的调查。这些是心理学探究的基石。请记住，往往没有唯一的“正确”答案——重要的是你如何用证据和逻辑推理来支持你的论点。
When you face WJEC exam questions on case studies, read the scenario carefully. Highlight key words. Note the command words: ‘identify’, ‘explain’, ‘evaluate’. A strong answer explains the ‘why’ and ‘how’, not just the ‘what’. Use psychological terminology accurately, and always consider alternative interpretations.
当你面对 WJEC 关于案例研究的考试问题时，仔细阅读情境。圈出关键词。注意指令词：“识别”、“解释”、“评估”。一个强有力的答案要解释“为什么”和“如何”，而不仅仅是“是什么”。准确使用心理学术语，并始终考虑其他解释。
Keep practising with new scenarios — perhaps a news story, a film character, or someone you know, while respecting confidentiality. The more you apply your psychological toolkit, the more confident and skilled a thinker you will become.
继续用新场景进行练习——也许是一个新闻故事、一个电影角色或你认识的某个人，同时要尊重保密性。你越多地运用你的心理学工具箱，你就会成为一个越自信、越熟练的思考者。
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