Edexcel心理学生物心理学神经元突触内分泌 | Edexcel Psychology: Biological Psychology, Neurons, Synapses & Endocrine System

Edexcel心理学生物心理学神经元突触内分泌

Topic 主题
Biopsychology 生物心理学
Edexcel A-Level Psychology Paper 试卷
Paper 1: Foundations in Psychology
约24-32分，选择题+简答题+论述题

1. The Nervous System 神经系统

The nervous system is our body's primary communication network, responsible for collecting, processing, and responding to information from the environment. It is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS).

神经系统是人体最重要的通信网络，负责收集、处理并响应来自环境的信息。它分为两大部分：中枢神经系统 (CNS) 和 外周神经系统 (PNS)。

CNS 中枢神经系统
Brain 大脑: consciousness, higher-order thinking, decision-making
Spinal cord 脊髓: reflex actions, relay between brain and body PNS 外周神经系统
Somatic NS 躯体神经: voluntary muscle movement, sensory input
Autonomic NS 自主神经: involuntary functions (heartbeat, digestion)

The autonomic nervous system further splits into the sympathetic and parasympathetic branches. The sympathetic system activates the body's "fight or flight" response — increasing heart rate, dilating pupils, and inhibiting digestion. The parasympathetic system returns the body to a resting state, often described as "rest and digest."

自主神经系统进一步分为交感神经和副交感神经。交感神经激活身体的"战斗或逃跑"反应——加快心率、放大瞳孔、抑制消化。副交感神经使身体恢复静息状态，常被描述为"休息和消化"。

Exam tip 考试技巧: When describing the nervous system in an exam, always start from the broadest division (CNS/PNS) and work downwards to specific branches. Use the mnemonic C-P-S-A-SP (Central → Peripheral → Somatic → Autonomic → Sympathetic/Parasympathetic) to structure your answer.

2. Neurons and Synaptic Transmission 神经元与突触传递

Neurons are specialised cells that transmit electrical and chemical signals. There are three types you must know for Edexcel: sensory neurons carry information from sense organs to the CNS; relay neurons (interneurons) connect sensory and motor neurons within the CNS; motor neurons carry signals from the CNS to muscles and glands.

神经元是传递电信号和化学信号的特化细胞。Edexcel考试要求掌握三种类型：感觉神经元将信息从感觉器官传至CNS；中间神经元在CNS内连接感觉与运动神经元；运动神经元将信号从CNS传至肌肉和腺体。

Sensory Neuron 感觉神经元
Long dendrites, short axon
Cell body in the middle
PNS → CNS direction Relay Neuron 中间神经元
Short dendrites, short axon
Entirely within CNS
No myelin sheath Motor Neuron 运动神经元
Short dendrites, long axon
Cell body at one end
CNS → effector direction

Synaptic transmission is the process by which signals cross the gap between two neurons. When an action potential reaches the presynaptic terminal, vesicles release neurotransmitters into the synaptic cleft. These molecules bind to receptors on the postsynaptic neuron, triggering either excitation (more likely to fire) or inhibition (less likely to fire). The net effect — summation — determines whether the postsynaptic neuron reaches its threshold and fires.

突触传递是信号跨越两个神经元之间间隙的过程。当动作电位到达突触前末梢时，囊泡释放神经递质进入突触间隙。这些分子与突触后神经元上的受体结合，引发兴奋（更可能放电）或抑制（更不可能放电）。净效应——总和——决定突触后神经元是否达到阈值并放电。

Key neurotransmitters to remember: acetylcholine (muscle contraction), dopamine (reward, motivation), serotonin (mood, sleep), and GABA (inhibitory, calming).

需要记住的关键神经递质：乙酰胆碱（肌肉收缩）、多巴胺（奖赏、动机）、血清素（情绪、睡眠）和GABA（抑制性、镇静）。

3. The Endocrine System 内分泌系统

While the nervous system acts in milliseconds using electrical impulses, the endocrine system works more slowly through chemical messengers called hormones, which travel through the bloodstream. The master gland is the pituitary gland, located in the brain — it controls the release of hormones from other glands.

神经系统以毫秒级速度通过电脉冲工作，内分泌系统则通过称为激素的化学信使在血液中缓慢运行。总指挥是位于大脑中的脑垂体——它控制其他腺体的激素释放。

Pituitary 脑垂体
"Master gland" 主腺体
ACTH, growth hormone, oxytocin Adrenal Medulla 肾上腺髓质
Adrenaline, noradrenaline
Fight or flight response Thyroid 甲状腺
Thyroxine 甲状腺素
Metabolism regulation Pineal 松果体
Melatonin 褪黑素
Sleep-wake cycle

Fight or Flight Response: When a threat is perceived, the hypothalamus activates the sympathomedullary pathway (SAM). The sympathetic nervous system triggers the adrenal medulla to release adrenaline. This causes: increased heart rate, faster breathing, pupil dilation, inhibited digestion, and increased blood flow to muscles — all preparing the body for immediate action. Once the threat passes, the parasympathetic system restores balance.

战斗或逃跑反应：当感知到威胁时，下丘脑激活交感肾上腺髓质通路 (SAM)。交感神经系统触发肾上腺髓质释放肾上腺素。这导致：心率加快、呼吸加速、瞳孔放大、消化受抑、肌肉血流量增加——全部为立即行动做好准备。威胁过后，副交感神经恢复平衡。

4. Localisation of Function in the Brain 大脑功能定位

The theory of localisation proposes that specific functions are associated with specific areas of the cerebral cortex. Key areas for Edexcel include:

功能定位理论认为，特定功能与大脑皮层的特定区域相关。Edexcel考试的关键区域包括：

Motor Cortex 运动皮层
Frontal lobe 额叶
Voluntary movement
Contralateral control (对侧控制) Somatosensory Cortex 躯体感觉皮层
Parietal lobe 顶叶
Touch, temperature, pain
Sensory homunculus (感觉小人) Broca's Area 布洛卡区
Left frontal lobe 左额叶
Speech production
Broca's aphasia: slow, laborious speech Wernicke's Area 韦尼克区
Left temporal lobe 左颞叶
Language comprehension
Wernicke's aphasia: fluent but meaningless speech

Evidence for localisation: Phineas Gage (1848) survived an iron rod through his frontal lobe, experiencing dramatic personality changes — from calm and polite to impulsive and aggressive. This case suggests the frontal lobe is involved in regulating personality and impulse control. Broca's study of patient "Tan" (who could only say "tan" after left frontal lobe damage) and Wernicke's patients provide clinical evidence for language localisation.

功能定位的证据：菲尼亚斯·盖奇（1848年）在一根铁棍穿过额叶后幸存，经历了巨大的人格变化——从冷静礼貌变为冲动好斗。这个案例表明额叶参与调节人格和冲动控制。布洛卡对病患"Tan"的研究（左额叶受损后只能说"tan"）和韦尼克的病患为语言定位提供了临床证据。

Evaluation: Modern brain scanning (fMRI, PET) supports localisation — Tulving et al. (1994) found episodic memories associated with the right prefrontal cortex while semantic memories activated the left. However, Lashley's equipotentiality theory argues higher cognitive functions are distributed across the cortex rather than strictly localised.

评估：现代脑部扫描（fMRI, PET）支持功能定位——Tulving等人（1994年）发现情景记忆与右前额叶皮层相关，而语义记忆激活左侧。然而，Lashley的等位理论认为高级认知功能分布在整个皮层，而非严格局限于某一区域。

5. Hemispheric Lateralisation and Split-Brain Research 半球偏侧化与裂脑研究

Hemispheric lateralisation refers to the idea that the two hemispheres of the brain are functionally different, with each hemisphere specialising in certain tasks. The left hemisphere is typically dominant for language and analytical processing, while the right is associated with spatial awareness, face recognition, and holistic processing. Note that these hemispheres are connected by the corpus callosum, a bundle of nerve fibres enabling inter-hemispheric communication.

半球偏侧化是指大脑两个半球功能不同，每个半脑专门负责某些任务。左半球通常在语言和分析处理方面占主导，右半球则与空间感知、人脸识别和整体处理相关。注意两个半球通过胼胝体——一束促进半球间通信的神经纤维——连接在一起。

Sperry's Split-Brain Research (1968): Sperry studied 11 patients whose corpus callosum had been severed (commissurotomy) to treat severe epilepsy. In his famous experiment, images were flashed to either the left or right visual field. When an image was shown to the right visual field (processed by the left hemisphere), patients could name it verbally. When shown to the left visual field (processed by the right hemisphere), patients could NOT name it but could select the object with their left hand. This demonstrated that language is lateralised to the left hemisphere.

Sperry的裂脑研究（1968年）：Sperry研究了11名因严重癫痫而切断胼胝体的患者。在他的经典实验中，图像被投射到左视野或右视野。当图像显示在右视野（由左半球处理）时，患者可以用语言命名它。当显示在左视野（由右半球处理）时，患者不能说出名称，但可以用左手选出对应物品。这证明了语言功能偏侧化于左半球。

Evaluation: Strengths include highly controlled laboratory procedures and consistent findings. However, the small sample size (11 participants) and the fact that all had a history of severe epilepsy (which may have caused unique brain reorganisation) limit generalisability. Furthermore, recent research suggests lateralisation is on a continuum rather than absolute — for example, some left-handed individuals have language functions in the right hemisphere or bilaterally distributed.

评估：优点包括高度受控的实验程序和一致的发现。然而，小样本量（11名参与者）以及所有参与者都有严重癫痫病史（可能导致独特的大脑重组）限制了推广性。此外，近期研究表明偏侧化是连续的而非绝对的——例如，一些左撇子的语言功能位于右半球或双侧分布。

6. Plasticity and Functional Recovery 可塑性与功能恢复

Brain plasticity refers to the brain's ability to change and adapt throughout life as a result of experience and learning. This includes synaptic pruning (eliminating unused connections), axonal sprouting (new nerve endings growing to connect with undamaged areas), and denervation supersensitivity (remaining axons becoming more sensitive to compensate for lost ones).

大脑可塑性是指大脑因经验和学习在一生中改变和适应的能力。这包括突触修剪（消除不用的连接）、轴突发芽（新神经末梢生长以连接未受损区域）和去神经过敏（剩余轴突变得更敏感以补偿失去的轴突）。

Maguire et al. (2000) studied London taxi drivers and found increased grey matter volume in the posterior hippocampus compared to matched controls — and the volume positively correlated with time spent as a taxi driver. This provides strong evidence for structural plasticity in response to environmental demands.

Maguire等人（2000年）研究了伦敦出租车司机，发现与匹配对照组相比，他们后海马体的灰质体积更大——且体积与做出租车司机的时间呈正相关。这为环境需求引起的结构可塑性提供了有力证据。

Functional recovery after trauma: After brain injury, the brain can recover function through several mechanisms: neuronal unmasking (dormant synapses becoming active), stem cell implantation (new cells replacing damaged ones), and rehabilitation (physical and cognitive therapy promoting neuroplasticity). Research by Taub (2002) on constraint-induced movement therapy showed that stroke patients who restrained their good arm and intensively practised with the affected arm showed significant recovery — demonstrating that targeted training can promote functional reorganisation.

创伤后功能恢复：脑损伤后，大脑可通过多种机制恢复功能：神经元揭蔽（休眠突触变得活跃）、干细胞植入（新细胞替换受损细胞）和康复治疗（物理和认知治疗促进神经可塑性）。Taub（2002年）关于约束诱导运动疗法的研究表明，约束健侧手臂并集中练习患侧手臂的中风患者表现出显著的恢复——证明有针对性的训练可以促进功能重组。

7. Ways of Studying the Brain 研究大脑的方法

fMRI 功能性磁共振成像
Measures blood flow (haemodynamic response) to detect active brain areas. Produces 3D images with high spatial resolution (~1-2mm). Non-invasive, no radiation.
Limitation: Poor temporal resolution (~5-second lag); only measures blood flow, not direct neural activity. EEG 脑电图
Electrodes on the scalp measure electrical activity across the brain surface. Excellent temporal resolution (millisecond-level). Used clinically to diagnose epilepsy and sleep disorders.
Limitation: Poor spatial resolution; only detects activity in superficial cortical layers. ERP 事件相关电位
A refined form of EEG — averages brainwave responses to specific stimuli across many trials. Allows researchers to isolate cognitive processes (e.g. P300 component linked to attention).
Limitation: Requires many trials; background noise and extraneous variables must be tightly controlled. Post-Mortem Examinations 尸检研究
Examining the brain after death, often comparing damaged brains to healthy ones. Broca and Wernicke used this method. Allows deep brain structures (e.g., hypothalamus, hippocampus) to be studied.
Limitation: Causation cannot be established; consent issues; damage may be caused by factors other than the variable of interest.

For the Edexcel exam, you must be able to compare these methods on spatial resolution (fMRI wins), temporal resolution (EEG/ERP win), invasiveness (fMRI/EEG/ERP are non-invasive), and whether they measure direct neural activity or indirect correlates.

在Edexcel考试中，你必须能够从空间分辨率（fMRI最佳）、时间分辨率（EEG/ERP最佳）、侵入性（fMRI/EEG/ERP无创）以及是否测量直接神经活动还是间接相关量等方面比较这些方法。

Exam Strategy: Structuring 8-Mark and 16-Mark Answers 答题策略

8-mark "Discuss" questions: Use the A01/A02 split — roughly 4 marks for knowledge (A01: describe the theory/research accurately) and 4 marks for evaluation (A02: strengths OR limitations, at least two well-developed points using PEEL: Point, Evidence, Explanation, Link).

8分"讨论"题：使用A01/A02分配——约4分知识分（A01：准确描述理论/研究）和4分评估分（A02：优点或局限，至少两个充分展开的要点，使用PEEL：观点、证据、解释、关联）。

16-mark "Evaluate" essays: Aim for ~6 marks A01 (description) and ~10 marks A02 (evaluation). Include at least 4 evaluation paragraphs covering: research support, methodological criticisms, alternative theories, practical applications, and issues and debates (e.g., nature vs. nurture, reductionism vs. holism). Always end with a brief conclusion weighing the evidence.

16分"评估"论文：目标约6分A01（描述）和约10分A02（评估）。至少包含4个评估段落，涵盖：研究支持、方法论批评、替代理论、实际应用和议题与辩论（如先天vs后天、还原论vs整体论）。始终以权衡证据的简要结论结尾。

Command words glossary: "Outline" = brief description; "Explain" = description + reasons; "Discuss" = description + evaluation (strengths AND limitations); "Evaluate" = judgement — weigh evidence for and against, reach a conclusion.

指令词术语表："Outline 概述" = 简要描述；"Explain 解释" = 描述+理由；"Discuss 讨论" = 描述+评估（优点和局限两者都要）；"Evaluate 评估" = 判断——权衡正反证据，得出结论。

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