📚 IGCSE CAIE Psychology: Core Knowledge Points Review | IGCSE CAIE 心理学：核心知识点梳理
Welcome to this comprehensive revision guide for Cambridge IGCSE Psychology. The syllabus is structured around a number of fascinating topics that explore how humans think, feel, sleep, remember, communicate, and behave in social settings. A solid understanding of research methods is also essential, as it underpins every study you will encounter. This article summarises the core knowledge points across eight key areas, helping you build a strong foundation for your exams and a deeper appreciation for the science of mind and behaviour.
欢迎阅读这份剑桥 IGCSE 心理学的全面复习指南。课程大纲围绕一系列引人入胜的主题展开，探索人类如何思考、感受、睡眠、记忆、交流以及在社会环境中表现。扎实理解研究方法是必不可少的基础，因为它支撑着你所遇到的每一个研究。本文梳理了八个核心领域的知识点，帮助你为考试打下坚实的基础，并加深对心理与行为科学的理解。
1. Research Methods | 研究方法
An experiment involves manipulating an independent variable (IV) to observe its effect on a dependent variable (DV), while keeping all other variables constant through standardisation and controls. The IV is the factor changed by the researcher, and the DV is the factor measured.
实验涉及操纵自变量(IV)以观察其对因变量(DV)的影响，同时通过标准化和控制保持所有其他变量不变。自变量是研究者改变的因素，因变量是被测量的因素。
Experimental designs include independent groups (different participants in each condition), repeated measures (same participants in all conditions), and matched pairs (similar participants matched on key traits). Each design has strengths and limitations, such as participant variables or order effects, which can be managed by random allocation or counterbalancing.
实验设计包括独立组设计（每种条件下不同的参与者）、重复测量设计（同一参与者参与所有条件）和匹配对设计（根据关键特征匹配相似参与者）。每种设计都有优点和局限，如参与者变量或顺序效应，可通过随机分配或平衡法进行控制。
Researchers also use non-experimental methods: observations (overt, covert, participant, non-participant), questionnaires, interviews (structured, unstructured), and case studies. These provide rich qualitative or quantitative data but may lack the control of experiments and have limitations in establishing cause and effect.
研究者也使用非实验方法：观察（公开、隐蔽、参与、非参与）、问卷、访谈（结构化、非结构化）和案例研究。这些方法提供丰富的质化或量化数据，但可能缺乏实验的控制，在建立因果关系方面存在局限。
Ethical guidelines are crucial. Key principles include informed consent, right to withdraw, confidentiality, protection from harm, and debriefing. Any study must be approved by an ethics committee to safeguard participants' wellbeing and dignity.
伦理准则至关重要。核心原则包括知情同意、退出权利、保密、免受伤害和事后解释。任何研究都必须经过伦理委员会批准，以保障参与者的福祉和尊严。
2. Memory and Forgetting | 记忆与遗忘
limited capacity of 7±2 chunks, duration around 18-30 seconds), and long-term memory (LTM, potentially unlimited capacity and duration). Information moves between stores through attention and rehearsal.
记忆的多存储模型描述了三个独立的储存库：感觉记忆（容量大，持续时间极短）、短时记忆（STM，容量有限，约7±2个组块，持续约18-30秒）和长时记忆（LTM，容量和持续时间可能无限）。信息通过注意和复述在储存库之间转移。
Forgetting can occur due to decay (fading of memory traces over time), interference (proactive — old memories disrupt new; retroactive — new memories disrupt old), or retrieval failure (cue-dependent forgetting). Context and state-dependent cues play a key role in successful recall.
遗忘可能由于衰退（记忆痕迹随时间消退）、干扰（前摄干扰——旧记忆干扰新记忆；倒摄干扰——新记忆干扰旧记忆）或提取失败（线索依赖遗忘）而发生。情境和状态依赖线索在成功回忆中起着关键作用。
Bartlett's theory of reconstructive memory argues that memories are not exact recordings but are reconstructed using schemas — mental frameworks based on past experience. This explains why memories can become distorted, as seen in the 'War of the Ghosts' study.
巴特利特的记忆重构理论认为记忆并非精确的录音，而是借助图式——基于过去经验的心理框架——进行重构。这解释了为何记忆会被歪曲，如'幽灵之战'研究所展示的那样。
3. Sleep and Dreams | 睡眠与梦
Sleep occurs in cycles of around 90 minutes, including non-rapid eye movement (NREM) stages 1-3 and rapid eye movement (REM) sleep. Stage 3 NREM is deep, slow-wave sleep, important for physical restoration, while REM sleep is associated with dreaming, brain activity similar to wakefulness, and memory consolidation.
睡眠以约90分钟的周期进行，包括非快速眼动（NREM）1-3期和快速眼动（REM）睡眠。NREM第3期是深度慢波睡眠，对身体恢复很重要，而REM睡眠与做梦、类似清醒时的大脑活动以及记忆巩固有关。
The restoration theory proposes that sleep allows the body and brain to repair and replenish. For example, growth hormone is secreted during deep sleep, and REM sleep may help clear the brain of unnecessary information. In contrast, the evolutionary theory suggests sleep helps conserve energy and keep organisms safe during darkness.
恢复理论提出，睡眠使身体和大脑得以修复和补充。例如，生长激素在深度睡眠期间分泌，而REM睡眠可能有助于清除大脑中不必要的信息。相反，进化理论认为睡眠有助于节约能量，并使生物体在黑暗中保持安全。
Dreams have been explained by different theories. Freud's wish-fulfilment theory suggests dreams represent unconscious desires and conflicts, with manifest and latent content. The activation-synthesis model proposes that dreams result from the brain's attempt to make sense of random neural signals generated during REM sleep.
梦有不同的理论解释。弗洛伊德的愿望满足理论认为梦代表无意识的欲望和冲突，包括显性和隐性内容。激活-合成模型提出，梦是大脑试图理解REM睡眠期间产生的随机神经信号的结果。
4. Pro-social Behaviour | 亲社会行为
Pro-social behaviour refers to voluntary actions intended to benefit others, such as helping, sharing, and cooperating. Altruism is a special form where the helper may even incur a cost without expecting personal gain. Researchers debate whether true altruism exists or all helping is ultimately self-interested.
亲社会行为指旨在造福他人的自愿行为，如帮助、分享与合作。利他主义是一种特殊形式，助人者甚至可能付出代价而不期望个人收益。研究者争论真正的利他主义是否存在，还是所有帮助行为最终都出于自利。
The bystander effect describes the finding that individuals are less likely to help in an emergency when others are present. Key factors include diffusion of responsibility, pluralistic ignorance (looking to others' reactions to define the situation), and evaluation apprehension. The more bystanders, the slower the help.
旁观者效应描述了个体在有其他人在场时更不可能在紧急情况下提供帮助的现象。关键因素包括责任扩散、多元无知（观察他人反应以界定情境）和评价恐惧。旁观者越多，帮助越慢。
Social exchange theory suggests helping is motivated by a cost-benefit analysis: people help when rewards outweigh costs. The empathy-altruism hypothesis, however, argues that feeling empathy for a person in need produces genuinely altruistic motivation, independent of personal gain.
社会交换理论认为帮助行为是由成本-收益分析驱动的：当收益大于成本时人们会帮助。而共情-利他假说则认为，对需要帮助的人产生共情会激发真正的利他动机，与个人收益无关。
5. Anti-social Behaviour | 反社会行为
Anti-social behaviour includes actions that harm or lack consideration for others, such as aggression, bullying, and vandalism. Aggression can be hostile (driven by anger and intent to harm) or instrumental (goal-oriented, used as a means to an end).
反社会行为包括伤害他人或不顾及他人的行为，如攻击、欺凌和故意破坏。攻击可以是敌意性（由愤怒和伤害意图驱动）或工具性（以目标为导向，作为达成目的的手段）。
The social learning theory of aggression, proposed by Bandura, states that aggression is learned through observation and imitation of role models, especially when the model's behaviour is seen to be rewarded (vicarious reinforcement). The Bobo doll experiment demonstrated how children imitate aggressive acts.
班杜拉提出的攻击社会学习理论指出，攻击行为通过观察和模仿榜样而习得，特别是当榜样的行为被看到受到奖励时（替代强化）。波波玩偶实验展示了儿童如何模仿攻击性行为。
The frustration-aggression hypothesis suggests that frustration — being blocked from achieving a goal — always leads to some form of aggression, and aggression is always the result of frustration. However, research shows the link is not inevitable; factors like the perceived injustice or presence of aggressive cues can intensify the response.
挫折-攻击假说认为，挫折——达成目标受阻——总会导致某种形式的攻击，而攻击总是挫折的结果。然而，研究表明这一联系并非必然；诸如感知到的不公平或攻击线索的存在等因素会加剧反应。
6. Attention | 注意力
Attention is the cognitive process of selectively concentrating on one aspect of the environment while ignoring others. Selective attention is often illustrated by the 'cocktail party effect', where you can focus on one conversation in a noisy room but still detect your own name in an unattended stream.
注意力是一种认知过程，指选择性地集中于环境的某一个方面而忽略其他。选择性注意通常通过'鸡尾酒会效应'来说明，即你能在嘈杂房间中专注于一段对话，但仍能在未注意的信息流中察觉自己的名字。
Broadbent's filter model proposed an early selection filter based on physical characteristics (e.g., voice pitch), allowing only attended information to pass for semantic processing. Treisman's attenuation model modified this, suggesting unattended messages are not entirely blocked but turned down (attenuated), and if content is highly relevant (like your name), it may still break through.
布罗德本特的过滤器模型提出了一个基于物理特征（如音调）的早期选择过滤器，只让被注意的信息通过以进行语义加工。特雷斯曼的衰减模型对此进行了修正，提出未注意的信息并未被完全阻断，而是被调低（衰减），如果内容高度相关（如你的名字），仍可能突破屏障。
Divided attention refers to the ability to process multiple sources of information simultaneously. Dual-task experiments show that performance declines when tasks compete for the same processing resources, but can improve with practice and automaticity (e.g., driving while talking becomes easier for experienced drivers).
分配性注意指同时处理多个信息来源的能力。双任务实验显示，当任务竞争相同的加工资源时，表现会下降，但随着练习和自动化程度的提高，表现可以改善（如经验丰富的驾驶员边开车边谈话会更容易）。
7. Perception | 知觉
Perception is the brain's interpretation of sensory information, giving it meaning. Sensation is the raw detection of stimuli by sense organs. The distinction can be demonstrated by visual illusions, where what we perceive does not match the physical reality of the stimulus.
知觉是大脑对感觉信息的解释，赋予其意义。感觉是感觉器官对刺激的原始探测。两者的区别可以通过视错觉来展示，即我们知觉到的内容与刺激的物理现实不一致。
Visual perception relies on depth cues to perceive a three-dimensional world. Monocular cues (usable with one eye) include linear perspective, relative size, texture gradient, and superimposition. Binocular cues rely on both eyes, particularly retinal disparity and convergence.
视觉知觉依赖深度线索来感知三维世界。单眼线索（单眼即可使用）包括线条透视、相对大小、纹理梯度和重叠。双眼线索依赖双眼，特别是视网膜像差和辐合。
Perceptual constancies allow us to see objects as unchanging despite changes in sensory input: size constancy (an object appears the same size at different distances), shape constancy (recognising a door as rectangular even when it opens and projects a trapezoidal image), and colour constancy.
知觉恒常性使我们即使感觉输入变化也能将物体视为不变：大小恒常性（物体在不同距离看起来大小不变）、形状恒常性（门打开时投射梯形图像，仍被识别为矩形）和颜色恒常性。
Gregory's constructivist theory suggests perception is an active process of hypothesis testing, heavily influenced by past experience and expectations (top-down processing). In contrast, Gibson's direct theory argues that the environment provides sufficient unambiguous information (affordances) for perception without the need for interpretation (bottom-up processing).
格雷戈里的建构主义理论认为知觉是一个主动的假设检验过程，深受过往经验和期望的影响（自上而下加工）。相反，吉布森的直接理论认为环境提供了足够明确的信息（功能可供性），知觉无需解释（自下而上加工）。
8. Language and Thought | 语言与思维
Language is a structured communication system with key components: phonemes (basic sound units), morphemes (smallest meaning units), syntax (grammar rules for sentence structure), and semantics (meaning). These layers allow the generation of infinite novel expressions.
语言是一个结构化的交流系统，包括关键组成部分：音位（基本声音单位）、词素（最小意义单位）、句法（句子结构的语法规则）和语义（意义）。这些层次允许生成无限的新颖表达。
The relationship between language and thought has been debated. The Sapir-Whorf hypothesis (linguistic relativity) argues that language determines or influences thought. For example, if a language has multiple words for snow, its speakers may perceive snow differently. Stronger versions propose linguistic determinism, while weaker versions support linguistic influence.
语言与思维的关系一直备受争议。萨丕尔-沃尔夫假说（语言相对论）认为语言决定或影响思维。例如，如果一种语言中有多个关于雪的词汇，其使用者可能对雪的感知有所不同。较激进的版本主张语言决定论，而温和的版本支持语言影响论。
Language development is explained by both nature and nurture. Chomsky's nativist theory proposes an innate language acquisition device (LAD) that enables children to acquire grammar rapidly. In contrast, Skinner's behaviourist account views language learning as a result of reinforcement and imitation, though this struggled to explain creativity and errors.
语言发展由先天和后天共同解释。乔姆斯基的先天论提出了先天的语言习得装置(LAD)，使儿童能够快速掌握语法。相反，斯金纳的行为主义解释将语言学习视为强化和模仿的结果，尽管这难以解释创造性和错误。
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