📚 Key Topics and Common Mistakes in Year 9 WJEC Psychology | 高频考点与易错题分析
Welcome to our focused revision guide for Year 9 WJEC Psychology. This article walks you through the most frequently assessed topics and pinpoints the typical mistakes students make in exams. By tackling these areas head-on, you can sharpen your understanding, avoid lost marks, and build confidence for success.
欢迎来到 Year 9 WJEC 心理学的专项复习指南。本文将梳理最高频的考点，并指出考试中学生反复出现的典型错误。直面这些内容能帮助你加深理解、避开扣分陷阱，为取得好成绩打下扎实基础。
1. Independent and Dependent Variables | 自变量与因变量
In any experiment, the independent variable (IV) is the factor that the researcher deliberately changes or manipulates. The dependent variable (DV) is the outcome that is measured after the change. A classic exam question asks you to identify both from a scenario.
在任何实验中，自变量（IV）是研究者有意改变或操纵的那个因素。因变量（DV）则是操纵变化后测量到的结果。考试中经典的一类题目就是要求你从情境中识别出两者。
The most frequent mistake here is reversal: students often label the thing being measured as the IV, or claim that the IV is the result. For example, in a study on whether music volume affects test scores, the IV is the volume level, not the score. The DV is the test score.
这里最常见的错误就是颠倒：许多学生会把被测量的东西标为 IV，或者声称 IV 是结果。例如，在一项研究音乐音量是否影响测验成绩的实验中，IV 是音量大小，而不是成绩；测验成绩是 DV。
Another pitfall is writing a full research question instead of a short, operationalised term. Examiners expect you to state the IV and DV concisely using specific conditions, such as 'presence of background music' versus 'silence'.
另一个易错点是写出长篇研究问题，而非简短、操作化的术语。阅卷者希望你用具体条件简洁陈述 IV 和 DV，比如“有无背景音乐”对照“安静环境”。
2. Controls and Confounding Variables | 控制变量与混淆变量
Control variables are all the factors kept the same across conditions to ensure a fair test. Confounding variables, however, are uncontrolled factors that might accidentally affect the DV and bias the results. Students often lump them together, but the key distinction is that confounds actually influence the outcome in a systematic way.
控制变量是指在不同条件下都保持相同的所有因素，以确保公平测试。而混淆变量则是那些未被控制、可能意外影响因变量并使结果产生偏差的因素。学生常把它们混为一谈，但关键区别在于混淆变量会以一种系统的方式真正左右结果。
A common slip is to list 'time of day' as a control variable but fail to recognise that if one group is tested in the morning and the other in the afternoon, time becomes a confounding variable. Always check whether the factor could offer an alternative explanation for the findings.
一个常见的疏忽是：把“一天中的时间”列为控制变量，却没意识到如果一组在早上测试，另一组在下午，时间就成了混淆变量。一定要检查该因素是否可能为结果提供另一种解释。
In WJEC questions, you may be asked to suggest one way to control a variable. Write a clear, practical step: 'All participants will be tested in the same quiet room' is better than a vague 'control the environment'.
在 WJEC 考试题中，你可能会被要求提出一种控制变量的方法。要写出明确、可操作的步骤，比如“所有参与者在同一安静房间内进行测试”，比笼统的“控制环境”要好得多。
3. Memory: The Multi-Store Model | 记忆：多存储模型
The multi-store model describes three separate stores: sensory register, short-term memory (STM), and long-term memory (LTM). High-frequency questions ask you to outline the capacity and duration of each store, and to explain how information moves between them through attention and rehearsal.
多存储模型描述了三个独立的存储器：感觉登记、短期记忆（STM）和长期记忆（LTM）。高频考题要求你概述每个存储器的容量和持续时间，并解释信息如何通过注意和复述在各个存储器之间转移。
duration (around half a second for visual information). STM has a limited capacity of about 7±2 chunks and a duration of around 18–30 seconds without rehearsal.
一个极常见的误解是说感觉登记的容量是无限的。实际上，它的容量非常大，但持续时间极短（视觉信息约半秒）。STM 的容量有限，约为 7±2 个组块，无复述下的持续时间约为 18－30 秒。
When describing LTM, many students wrongly claim its capacity is 'seven items'. LTM actually has potentially unlimited capacity and duration. Errors also occur when labelling types of encoding: STM is mainly acoustic, LTM is mainly semantic.
在描述 LTM 时，不少学生错误地声称其容量是“7 个项目”。实际上 LTM 的容量和持续时间在理论上是无限的。还会出现在编码类型的标注上犯错：STM 主要是声学编码，LTM 主要是语义编码。
4. Attachment: Types and the Strange Situation | 依恋：类型与陌生情境
Ainsworth's Strange Situation is used to assess attachment type in infants. The three main types are secure (Type B), insecure-avoidant (Type A), and insecure-resistant (Type C). WJEC exams regularly test the behaviours displayed in the reunion episodes.
安斯沃思的陌生情境用于评估婴儿的依恋类型。三种主要类型是安全型（B 型）、不安全－回避型（A 型）和不安全－反抗型（C 型）。WJEC 考试经常考查重聚阶段所表现出来的行为。
The most common mistake is mixing up avoidant and resistant infants. Avoidant babies tend to ignore the caregiver upon return and show little distress during separation. Resistant babies show intense distress at separation but resist comfort upon reunion, often pushing the caregiver away.
最常见的错误是把回避型和反抗型婴儿搞混。回避型婴儿在母亲回来时往往不理不睬，分离时几乎不表现出痛苦；反抗型婴儿在分离时极度痛苦，但在重聚时却抗拒安慰，常把照顾者推开。
Another trap is forgetting to relate the behaviour to the caregiver's sensitivity. Secure attachment is linked to consistently sensitive caregiving; avoidant attachment is associated with rejecting or intrusive care. Use these links to explain, not just identify, the type.
另一个陷阱是忘记将行为与照顾者的敏感性联系起来。安全型依恋与持续敏感的照顾相关；回避型依恋则与拒绝或干扰型照顾相关。要利用这些联系来解释依恋类型，而不仅仅是识别出来。
5. Conformity and Obedience: Asch and Milgram | 从众与服从：阿希与米尔格拉姆
Conformity is changing your behaviour or beliefs to fit in with the group; obedience is following a direct order from an authority figure. Students routinely confuse the two classic studies: Asch investigated majority influence on line judgement, while Milgram studied obedience to authority using fake electric shocks.
从众是指为融入群体而改变行为或信念；服从是指遵循权威人物的直接命令。学生们经常混淆这两个经典研究：阿希探究了多数人对线条判断的影响，而米尔格拉姆使用虚假电击研究了服从权威。
A high-frequency mistake is labelling Asch as a study of obedience. Remember, Asch's participants had to give an answer publicly after hearing confederates; there was no direct order. Milgram's participants were explicitly told to continue by an experimenter in a lab coat.
一个高频错误是把阿希的研究标成服从研究。记住，阿希的参与者是在听到同谋者的回答后公开给出答案，没有直接命令。米尔格拉姆的参与者是被身穿实验室白大褂的实验者明确指令继续的。
When describing the results, avoid vague phrases like 'many people conformed'. For Asch, around 75% conformed at least once, and the overall conformity rate was about 37% of critical trials. For Milgram, 65% went up to the maximum 450 volts.
在描述结果时，不要使用“许多人都从众了”这类模糊表达。阿希实验中，约 75％ 的参与者至少从众一次，关键试次的从众率约 37％。米尔格拉姆实验中，65％ 的参与者一直服从到最高 450 伏特。
6. Social Influence: Normative vs Informational | 社会影响：规范性与信息性
Deutsch and Gerard proposed two explanations for conformity: normative social influence (desire to be liked and accepted) and informational social influence (desire to be right, looking to others for guidance in ambiguous situations).
多伊奇和杰拉德提出了从众的两种解释：规范性社会影响（渴望被喜欢和接纳）与信息性社会影响（渴望正确，在模糊情境中向他人寻求指引）。
A typical error is applying informational influence to a clear Asch-type situation where the correct line was obvious. In that task, participants conformed mainly due to normative pressure – they knew the right answer but did not want to stand out. Informational influence applies when the task is difficult or ambiguous.
一个典型错误是把信息性影响套用在阿希式的清晰情境中，而那里正确答案是一目了然的。在这种任务里，参与者主要因规范性压力而从众——他们知道正确答案但不想显得突出。信息性影响则适用于任务困难或模糊时。
Ensure you can provide an exam-friendly example: a student laughing at a joke they don't understand because everyone else is laughing demonstrates normative influence; copying a classmate's answer during a tricky physics problem when you genuinely don't know the answer illustrates informational influence.
确保你能给出适合考试的例子：一个学生听不懂笑话却因为大家都笑而跟着笑，这是规范性影响；在做一道棘手物理题时，因为你真的不知道答案而抄袭同学的解答，这体现了信息性影响。
7. Visual Illusions: Top-Down and Bottom-Up Processing | 视觉错觉：自上而下与自下而上加工
Visual illusions occur when perception does not match physical reality. The WJEC syllabus often features the Muller-Lyer illusion and the Ponzo illusion. Questions expect you to explain them using top-down processing, which relies on past experience, context, and schemas.
当知觉与物理现实不符时，就产生了视觉错觉。WJEC 教学大纲常涉及缪勒-莱耶错觉和庞佐错觉。题目要求你使用自上而下加工来解释，这种加工依赖于过往经验、背景和图式。
Many students mistakenly attribute illusions to a fault in the eye (sensation) rather than misinterpretation by the brain (perception). Remember, top-down processing applies existing knowledge to sensory input, which can lead to systematic errors.
许多学生错误地将错觉归因于眼睛的问题（感觉），而非大脑的误读（知觉）。记住，自上而下加工是将已有知识运用到感觉输入上，这可能导致系统性的错误。
For the Muller-Lyer illusion, the arrowheads provide depth cues: the line with outgoing fins is perceived as the outside corner of a building and therefore further away, making it appear longer even though retinal images are equal. A common exam error is saying the lines 'are actually different lengths' – state clearly that they are physically identical.
在缪勒-莱耶错觉中，箭头提供了深度线索：两端开口的线段被知觉为建筑的外角，因而更远，使其看起来更长，尽管视网膜影像相同。一个考试常见错误是说“线实际长度不同”——应明确指出它们物理长度是相等的。
8. The Nervous System: CNS and PNS | 神经系统：中枢与周围神经系统
The human nervous system is split into the central nervous system (CNS), consisting of the brain and spinal cord, and the peripheral nervous system (PNS), which connects the CNS to the rest of the body. The PNS is further divided into the somatic and autonomic systems.
人类神经系统分为中枢神经系统（CNS）和周围神经系统（PNS）。CNS 包括脑和脊髓，PNS 则将 CNS 与身体其他部分连接起来。PNS 进一步分为躯体神经系统和自主神经系统。
A glaring error many Year 9 students make is placing the spinal cord in the PNS. Repeat this mantra: the spinal cord is part of the CNS. The PNS contains the nerves radiating out from the spinal cord, not the cord itself.
许多 Year 9 学生一个明显的错误是把脊髓归入 PNS。请反复记住这句话：脊髓是 CNS 的一部分。PNS 包含的是由脊髓辐射出去的神经，而不是脊髓本身。
When defining the autonomic nervous system, avoid saying it controls 'muscles we can control'. The autonomic system controls involuntary internal functions such as heartbeat, breathing, and digestion. The somatic system controls voluntary skeletal muscle movements.
在定义自主神经系统时，避免说它控制“我们能控制的肌肉”。自主神经系统控制的是不随意的内在功能，如心跳、呼吸和消化。躯体神经系统则控制随意的骨骼肌运动。
9. Research Ethics and Informed Consent | 研究伦理与知情同意
Ethical principles are a cornerstone of WJEC psychology exams. You must know the core guidelines: informed consent, right to withdraw, protection from harm, confidentiality, and avoidance of deception unless absolutely necessary and followed by a thorough debrief.
伦理原则是 WJEC 心理学考试的基石。你必须了解核心准则：知情同意、退出权、免受伤害、保密，以及除非绝对必要且事后有详细解释，否则应避免欺骗。
A typical mistake is writing 'participants must agree to take part' without mentioning they need full information about the true nature of the study. If full consent cannot be obtained, you should describe how the researcher could gain presumptive consent or use a retrospective consent procedure.
一个典型错误是只写“参与者必须同意参加”，而未提及他们需要得到关于研究真实性质的充分信息。如果无法获得充分同意，你应描述研究者如何获得事先同意或事后回顾性同意。
When asked to evaluate a study ethically, many students simply write 'it was unethical'. This earns minimal marks. Instead, identify a specific issue (e.g. deception in Milgram) and explain why it is a problem (it prevented true informed consent and caused distress). Then suggest an improvement, such as screening participants and clearly reminding them of their right to withdraw.
当被要求从伦理角度评价一个研究时，许多学生只写“这是不道德的”。这只能得到微薄的分数。相反，要指出一个具体问题（如米尔格拉姆研究中的欺骗），解释它为何有问题（妨碍了真实知情同意，并引起了痛苦），再提出改进措施，如筛查参与者并明确提醒他们有退出权。
10. Data Handling: Graphs and Averages | 数据处理：图表与平均数
WJEC expects you to interpret and sketch simple graphs and to calculate the mean, median, and mode. For categorical data, use bar charts; for continuous data showing change over time, use line graphs. Many students lose marks by drawing a line graph for independent categories.
WJEC 要求你能够解读和绘制简单图表，并计算均值、中位数和众数。对于分类数据，使用柱状图；对于显示随时间变化的连续数据，使用线图。许多学生因为给独立类别绘制线图而失分。
A common mathematical slip is using the mean for skewed data. The mean is pulled by extreme outliers, so the median is often a better measure of central tendency when data are not symmetrical. Explicitly justify your choice of average in evaluation questions.
一个常见的数学疏忽是在偏态数据中使用均值。均值会被极端异常值拉高或拉低，因此当数据不对称时，中位数往往是更好的集中趋势量度。在评价题中要明确论证你对平均数的选择。
The classic exam error table highlights confusion between central tendency measures:
| Common Confusion | Why It's Incorrect |
|---|---|
| Saying the mode is always the best average | The mode can be unrepresentative if it appears only once more than other values and ignores the rest of the data. |
| Calculating the mean by summing only some values | The mean must use all data points; missing values distort the result. |
经典考试错误表能够突出对集中趋势量度的混淆：称“众数总是最佳平均数”是不正确的，因为若与众数次频数仅相差 1，它可能忽略其它数据而不具代表性；计算均值时若只加总部分数值，结果就会失真。
11. Sampling Methods and Bias | 抽样方法与偏差
Sampling is how participants are selected. The main WJEC methods are random sampling (everyone has an equal chance), opportunity sampling (using available people), and systematic sampling (selecting every nth person). These are linked to the representativeness and generalisability of findings.
抽样是指如何选取参与者。WJEC 主要要求的方法有：随机抽样（人人都有相等的机会）、机会抽样（使用方便找到的人）和系统抽样（每第 n 个人入选）。这些都与研究结果的代表性和推广性相关。
A recurring error is thinking random sampling means 'choosing whoever you find at random'. True random sampling requires a sampling frame (e.g. a list of every student in a school) and a random technique such as using a random number generator or drawing names from a hat for every single person.
一个反复出现的错误是以为随机抽样就是“随便挑你碰到的人”。真正的随机抽样需要一个抽样框（如全校所有学生的名单），并使用随机技术如随机数生成器，或为每一个人从帽子里抽取名字。
Another mistake involves bias: stating that opportunity sampling is always biased. While it is often biased because it may draw from a narrow subgroup, you must be able to explain why – for example, standing outside a single classroom on a Tuesday morning only captures that subset of students, not the entire target population. Relate bias directly to lowered population validity.
另一个错误涉及偏差：声称机会抽样总是有偏。虽然它确实常因仅抽取一个狭窄子群体而有偏，但你必须能够解释原因——例如，周二上午站在一间教室外只能捕获那部分学生，而非整个目标总体。要将偏差直接联系到总体效度的降低。
12. Key Study Analysis and Evaluation | 关键研究分析与评价
When describing a key study, structure your answer with the aim, method (design, sample), procedure in brief, results, and conclusion. A high-frequency pitfall is rambling about irrelevant details while skipping the operationalised aim or the main numerical findings.
描述关键研究时，要按目的、方法（设计、样本）、简要过程、结果和结论来组织答案。一个高频误区是一大堆无关细节，却跳过了操作化的目的或主要的数据结果。
Evaluation demands both strengths and weaknesses. A common mistake is writing 'the sample was small' without explaining why size matters, or mentioning 'high ecological validity' for a lab study without justification. Always link your point to the specific study: e.g. 'Asch used 123 male students, which limits generalisability to other genders and age groups.'
评价要求同时写出优点和弱点。一个常见错误是写“样本很小”却不解释样本量为什么重要，或者不提供理由就说一个实验室研究具有“高生态效度”。一定要把你的论点与具体研究挂钩，例如：“阿希使用了 123 名男性大学生，这限制了向其他性别和年龄人群的推广。”
Another trap is confusing reliability (consistency of results) with validity (accuracy, measuring what it claims). When you say a study is reliable because it was replicated, make clear that you mean it produced similar findings. Validity might be undermined by demand characteristics in an artificial setting.
另一个陷阱是混淆信度（结果的一致性）和效度（准确性，测到想要测的东西）。当你说一项研究因其被重复而具有高信度时，要明确你的意思是它得到了相似的结果。而效度可能因人设环境中的要求特征而降低。
Finally, when asked 'What would you change to improve this study?' be specific. Instead of 'increase the sample', write 'recruit 30 male and 30 female teenagers from three local schools to enhance population validity'. Such operational improvements signal a higher-level response.
最后，当被问到“你会如何改变以改进这项研究？”时，要具体。不要只写“增加样本量”，而写“从三所当地学校招募各 30 名男女青少年以提高总体效度”。这样操作化的改进意味着更高水平的作答。
Published by TutorHao | Psychology Revision Series | aleveler.com
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