📚 GCSE CIE Psychology: Speech and Hearing Revision Guide | GCSE CIE 心理学：口语/听力备考专项
Preparing for the CIE IGCSE Psychology exam involves mastering topics that link cognition, biology and development. Among these, speech (oral language) and hearing are crucial areas under the 'Language, thought and communication' and 'Sensation and perception' sections. This revision guide breaks down everything from the mechanics of the ear to theories of language acquisition, key studies and exam strategies.
备考 CIE IGCSE 心理学科目需要掌握连接认知、生物与发展心理学的各类主题。其中，口语（口头语言）与听力是 “语言、思维与交流” 以及 “感觉与知觉” 板块中的重点内容。本备考指南将从耳朵的生理机制讲起，涵盖语言习得理论、关键研究以及考试答题策略。
1. The Auditory System: How We Hear | 听觉系统：我们如何听见声音
The outer ear (pinna) funnels sound waves into the ear canal, causing the eardrum to vibrate. These vibrations are amplified by three tiny bones in the middle ear — the hammer, anvil and stirrup (malleus, incus, stapes) — and transmitted to the oval window of the cochlea in the inner ear.
外耳（耳廓）将声波汇聚进耳道，引起鼓膜振动。这些振动经中耳的三块小骨 — 锤骨、砧骨和镫骨 — 放大后，传至内耳耳蜗的卵圆窗。
Inside the fluid-filled cochlea, the basilar membrane moves, bending hair cells that line it. This mechanical movement is converted into neural signals sent via the auditory nerve to the brain's auditory cortex.
在充满液体的耳蜗内部，基底膜运动并使其上的毛细胞弯曲。这种机械运动被转化为神经信号，经听神经传至大脑的听觉皮层。
Two main theories explain pitch perception: place theory (different frequencies peak at different locations along the basilar membrane) and frequency theory (the rate of nerve impulses matches the sound frequency, at least for low pitches).
解释音高知觉的主要理论有两个：位置理论（不同频率在基底膜上不同位置产生最大反应）和频率理论（神经冲动的发放速率与声音频率匹配，至少对于低频声音而言）。
2. Sound Localisation and Auditory Scene Analysis | 声音定位与听觉场景分析
To locate a sound source, the brain uses binaural cues — differences between the two ears. The two main cues are the interaural time difference (ITD) and the interaural level difference (ILD).
为了确定声源位置，大脑利用双耳线索 — 两耳之间的差异。主要线索是双耳时间差（ITD）和双耳声级差（ILD）。
ITD is the tiny delay in a sound reaching one ear compared to the other, important for low-frequency sounds. ILD is the difference in loudness caused by the head casting an acoustic shadow, particularly useful for high-frequency sounds.
ITD 是指声音到达一耳比另一耳出现微小延迟，对低频声音很重要。ILD 是因头部产生声影造成的响度差异，特别有助于高频声音定位。
Auditory scene analysis allows us to separate a complex mixture of sounds into distinct streams, such as following a single conversation in a noisy room — the cocktail party effect. This involves grouping sounds by pitch, timbre and spatial location.
听觉场景分析使我们能将复杂混合声音分离为不同的听觉流，例如在嘈杂房间中跟随单一对话 — 鸡尾酒会效应。这涉及根据音高、音色和空间位置对声音进行分组。
3. Speech Perception: From Sounds to Words | 言语知觉：从声音到词语
Speech perception is remarkable because we can perceive phonemes — the smallest units of sound in a language — even when they are physically quite variable across speakers and contexts. Research shows we perceive speech categorically, meaning we hear abrupt boundaries between phonemes (e.g., /b/ versus /p/).
言语知觉非常神奇，因为我们能够感知音位 — 语言中最小的声音单位 — 即使这些音位在不同说话者和语境下物理特性变化很大。研究表明，我们以类别方式感知言语，即我们会听到音位之间（例如 /b/ 与 /p/）的突显界限。
Eimas et al. (1971) demonstrated that even one-month-old infants show categorical perception of voice onset time (VOT) changes, suggesting an innate basis for speech perception. The McGurk effect shows visual information (lip movements) can alter what we hear, highlighting multisensory integration.
Eimas 等人（1971）证明，即使一个月大的婴儿也会对嗓音起音时间（VOT）的变化表现出类别感知，表明言语知觉具有先天基础。麦格克效应（McGurk effect）表明视觉信息（唇部运动）能够
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