AQA心理 生物心理学 神经元 突触 节律
生物心理学把行为放回神经系统里解释：从两个神经元之间的递质交换，到脑区分工、半球偏侧化，再到昼夜节律与睡眠周期，这条线索在 AQA 的 A-level 心理学 7182 里被单独列为一个模块，放在 Paper 2 Psychology in Context 的 Section B，96 分的卷面里占 24 分，考试时长 2 小时。Edexcel 的 9PS0 不设同名模块，突触传递与生物学的行为解释归在 Paper 1 Foundations in Psychology 的生物心理学部分，综合运用落在 Paper 3 Psychological Skills。两份规范都是 2015 年 9 月起施教、2017 年首次认证，内容口径基本一致，差别只在卷面位置。很多学生以为这一块背熟名词就能过，实际上考题反复要求把机制写完整，再用研究证据去评价。下面按神经系统、神经元与突触、内分泌、脑区定位、裂脑、可塑性、研究脑的方法、三种生物节律、起搏器与授时因子这九条线索展开，最后落在卷面时间与答题结构上。
Biopsychology puts behaviour back inside the nervous system, travelling from transmitter exchange at a single synapse through localised brain function, hemispheric lateralisation, plasticity and biological rhythms. AQA treats it as a module of its own inside A-level Psychology 7182, where Paper 2 carries 96 marks and 33.3% of the qualification and Biopsychology occupies a 24-mark section; Edexcel folds the same material into Paper 1 biological psychology and re-examines it in Paper 3 Psychological Skills. Both specifications were first taught from September 2015 with first certification in 2017, so the content overlaps even though the paper positions differ. Marks here rarely go to students who can only name structures; they go to those who can describe a mechanism in order and then use research evidence to argue about it.
神经系统的分层
中枢神经系统由脑与脊髓构成，脊髓不只是上传下达的通道，它自身就能完成反射弧的整合，膝跳反射的全过程不需要大脑参与。周围神经系统分成躯体与自主两支，躯体神经支配骨骼肌，负责随意动作与感觉输入；自主神经支配心肌、平滑肌与腺体，下面又分交感与副交感。交感支在应激状态下让心率加快、瞳孔放大、气道扩张、消化活动受抑制，副交感支随后把身体拉回静息状态。以静息心率每分钟 70 次左右为例，交感兴奋可以让它升到 100 次以上，副交感激活再把它压回来。常见的错误是把两者当成开关的两端，实际它们持续同时活动，谁占优势取决于当下状态。学生最常把自主神经的效应写反，例如写成副交感让瞳孔放大，这一句在短答题里直接丢分。
The central nervous system consists of the brain and the spinal cord, and the cord does more than relay messages: it integrates reflex arcs such as the knee-jerk response with no involvement from the brain at all. The peripheral system splits into a somatic branch, which carries voluntary signals to skeletal muscle plus sensory input from skin and joints, and an autonomic branch controlling cardiac muscle, smooth muscle and glands; the autonomic side divides again into sympathetic and parasympathetic. Under stress the sympathetic branch lifts heart rate, dilates the pupils, widens the airways and suppresses digestion, while the parasympathetic branch restores rest, so a rate near 70 beats per minute can rise above 100 and then be brought back down. Examiners still read answers that treat the two branches as an on-off switch, when both are active at once and only the balance between them shifts.
神经元与突触传递
神经元按功能分成三类，感觉神经元把感受器的信息传向中枢，中间神经元在中枢内部建立连接，运动神经元把指令送到效应器。动作电位沿轴突传到突触前末梢后，电压门控钙通道打开，含递质的囊泡与前膜融合并释放内容物，递质扩散跨过约 20 纳米宽的突触间隙，与突触后膜受体结合，引起钠离子内流或氯离子内流，形成兴奋性突触后电位或抑制性突触后电位。兴奋与抑制信号在突触后叠加，空间总和来自不同突触同时到达的信号，时间总和来自同一突触的连续发放，总电位超过阈值才会触发下一个动作电位。乙酰胆碱与多巴胺常被列为兴奋性递质，GABA 与血清素多起抑制作用，但一种递质究竟起什么作用取决于受体类型。很多学生以为一次动作电位必然传给下一个神经元，实际上它可能被抑制性输入抵消，麻醉药与镇静剂正是作用在这类环节上。Edexcel 2018 年 Paper 1 Section C 有一道 3 分题直接要求描述突触传递，答题链要写成电位到达、囊泡释放、递质扩散、受体结合、离子通道打开这五步。
Neurons fall into three functional classes: sensory neurons carry receptor information towards the central nervous system, relay neurons connect structures inside it, and motor neurons carry instructions out to effectors. An action potential arriving at the presynaptic terminal opens voltage-gated calcium channels, vesicles fuse with the membrane and release transmitter, which diffuses across a cleft roughly 20 nanometres wide and binds to receptors on the postsynaptic membrane; sodium or chloride ions then move, producing an excitatory or inhibitory postsynaptic potential. Excitatory and inhibitory signals summate, spatial summation adding inputs that arrive from different synapses at once and temporal summation adding repeated firing from one synapse, and only a potential past threshold triggers the next action potential. Many students assume one action potential must be passed on, yet inhibitory input can cancel it, which is where anaesthetics and sedatives act; Edexcel asked for a three-mark description of synaptic transmission in the 2018 Paper 1 Section C, and the chain has to run arrival, release, diffusion, binding, ion channels.
内分泌系统与战逃反应
内分泌系统通过血液把激素送到全身，垂体是主腺体，它分泌的激素调控甲状腺、肾上腺与性腺。急性应激走的是交感-肾上腺髓质通路，下丘脑激活交感神经，肾上腺髓质把肾上腺素与去甲肾上腺素释放进血液，心率与呼吸加快、血糖上升，血液从消化道转向骨骼肌。慢性应激走的是下丘脑-垂体-肾上腺轴，最终由肾上腺皮质分泌皮质醇，长期偏高与免疫抑制、睡眠紊乱相关。两条通路的差别是常考点，髓质管快，皮质管久，名字只差一个字，位置与功能都不同。常见的错误是把皮质醇写成髓质分泌，或者写战逃反应时只列生理症状而漏掉认知评价这一环。阅卷时看到只有症状清单而没有机制链，通常最多给到描述分的一半。
The endocrine system sends hormones through the bloodstream, with the pituitary acting as the master gland whose secretions regulate the thyroid, the adrenal glands and the gonads. Acute stress runs through the sympathomedullary pathway, where the hypothalamus activates sympathetic nerves and the adrenal medulla releases adrenaline and noradrenaline into the blood so that heart rate and breathing rise, glucose climbs and blood is diverted from digestion to skeletal muscle. Chronic stress runs through the hypothalamic-pituitary-adrenal axis, ending with cortisol from the adrenal cortex, and sustained high levels are linked to immune suppression and disturbed sleep. Candidates lose marks by attributing cortisol to the medulla, or by listing symptoms of the fight or flight response without the cognitive appraisal that starts it; a symptom list with no mechanism usually earns about half of the description marks.
脑区定位与语言中枢
运动区位于额叶的前中央回，身体各部位在皮层上的代表面积与动作精细度成正比，手与面部的面积远大于躯干。躯体感觉区位于顶叶的后中央回，视觉区在枕叶，听觉区在颞叶，四者构成定位说最直接的证据。语言的两个关键区落在多数人的左半球额颞网络里，布洛卡区在额叶，损伤后言语产出受阻、电报式表达但理解尚存；韦尼克区在颞叶偏后，损伤后口语流利却内容空洞、理解受损。很多学生以为语言只由左半球负责，实际右半球在语调、隐喻与语境推断上有分工，右脑损伤的患者句子说得完整，却读不懂讽刺。个案研究是这一节的主要证据来源，Leborgne 的尸检让布洛卡区得名，代价是样本只有个位数且无法重复检验。评价定位说时，写清功能并非绝对固定，比复述一遍皮层地图更容易落在评价分上。
The motor area sits in the precentral gyrus of the frontal lobe, where the cortical space given to each body part scales with the precision of its movement and the hands and face take far more room than the trunk. The somatosensory area lies in the postcentral gyrus of the parietal lobe, the visual area in the occipital lobe and the auditory area in the temporal lobe. Language depends on a frontotemporal network in the left hemisphere for most people: damage to Broca's area in the frontal lobe disrupts production and leaves telegraphic speech with comprehension largely intact, whereas damage to Wernicke's area further back in the temporal lobe leaves fluent but empty speech with impaired understanding. Many students assume the left hemisphere handles language alone, yet the right hemisphere contributes intonation, metaphor and inference, which is why right-sided damage can leave sentences intact while sarcasm is missed. Evidence here rests on case studies such as Leborgne, whose post-mortem gave Broca's area its name; answers that describe compensation pathways after damage tend to land in the evaluation band better than answers that repeat the cortical map.
裂脑研究与半球偏侧化
裂脑研究来自对胼胝体切断患者的测试，Sperry 与 Gazzaniga 在 1960 年代把图像短暂呈现给患者的左视野或右视野，再要求患者在看不到刺激的条件下用手或语言回应。右视野的信息进入左半球，患者能说出看到的物体名称；左视野的信息进入右半球，患者说不出名称，却能用手从一堆物品里挑出对应物件。Sperry 1968 年的报告据此提出两半球功能上有分工，左半球偏语言与逻辑加工，右半球偏空间与整体加工。局限同样清楚，样本只有 11 名患者，呈现时间与程序在不同被试之间并不统一，胼胝体切断本身也改变了脑的运作方式，结论推广到普通人需要谨慎。很多学生以为裂脑患者出现了两个人格，实验里看到的是同一套行为在不同输出通道上被分开。写评价时把样本量、程序标准化与生态效度三点写全，通常能覆盖大多数评分点。
Split-brain research tested patients whose corpus callosum had been severed, with Sperry and Gazzaniga presenting images briefly to the left or the right visual field in the 1960s and asking for a manual or verbal response while the stimulus stayed out of sight. Information from the right visual field reaches the left hemisphere, so the patient can name the object; information from the left visual field reaches the right hemisphere, so the patient cannot name it but can still select a matching object by hand. Sperry reported in 1968 that the hemispheres specialise, the left leaning towards language and logic and the right towards spatial and holistic processing, though the sample held only 11 patients. Severing the callosum also changes how the brain operates, so generalising to typical brains needs care; candidates who cover sample size, standardisation and ecological validity usually collect most of the evaluation marks.
可塑性与功能恢复
可塑性指神经系统随经验改变结构与功能的能力，突触连接会被强化或修剪，使用频繁的通路效率上升。Maguire 在 2000 年用 MRI 比较伦敦出租车司机与对照组，发现司机的海马后部灰质体积更大，且与驾龄呈正相关。功能恢复依赖几条机制，轴突生长形成新的突触连接，未受损区域接过受损区的功能，神经干细胞分化补充细胞。这些机制的证据强度并不相同，轴突生长在动物模型上比较明确，干细胞治疗的临床应用仍处在研究阶段。很多学生以为成年后大脑结构就固定了，成年脑其实仍保留相当程度的可塑，只是幅度小于发育期。相关性是这一节最容易被忽略的软肋，海马更大的人可能本来就更擅长空间记忆，才去考出租车执照，横断设计排除不了这种解释。评价句写到这一层，比重复一次研究结论更有分量。
Plasticity is the capacity of the nervous system to change its structure and function with experience, as synapses strengthen or are pruned and frequently used pathways become more efficient. Maguire compared London taxi drivers with controls using MRI in 2000 and found greater posterior hippocampal grey matter in the drivers, correlating with years of experience. Recovery after damage relies on several mechanisms: axonal sprouting that forms new synaptic connections, undamaged regions taking over the function of damaged tissue, and stem cells replacing lost cells; the strength of the evidence differs, since sprouting is well documented in animals while stem cell therapy remains experimental. Many students assume the adult brain is fixed, yet plasticity survives into adulthood, less than during development. The hidden weakness is correlation, because people with a larger hippocampus may already have stronger spatial memory and choose the taxi trade, an explanation a cross-sectional design cannot rule out.
研究大脑的四种方法
fMRI 通过血氧水平依赖信号间接测量脑活动，空间分辨率可以细到 1 毫米左右，时间分辨率只有秒级，因为血流反应本身存在延迟。EEG 用头皮电极记录皮层神经元同步活动产生的电位，时间精度到毫秒，代价是空间定位模糊，颅骨与肌肉电位会混进信号。ERP 是 EEG 的刺激锁定平均技术，把与特定刺激相关的电位从背景噪声中分离出来。尸检能检查深层结构与罕见病例，却无法确认死前的功能状态，样本往往带有病理改变。很多学生以为 fMRI 直接拍到神经元放电，它记录的其实是血流变化，相关不等于因果，一项任务激活某个区域只能说明这个区域参与了任务。答题时把每种方法的时空分辨率与一条具体局限配对写，比笼统写准确或先进更容易落在得分点上。
Functional magnetic resonance imaging measures brain activity indirectly through the blood-oxygen-level-dependent signal, giving spatial resolution down to roughly one millimetre but temporal resolution only in seconds because the haemodynamic response lags. Electroencephalography records the summed electrical activity of cortical neurons from scalp electrodes with millisecond timing, at the price of poor spatial localisation, since skull and muscle potentials leak into the trace; event-related potentials average the EEG signal time-locked to a stimulus, which separates the response of interest from background noise. Post-mortem examination can reach deep structures and rare cases, though it cannot confirm the functional state before death and the tissue often carries pathological change. Many students believe fMRI photographs neuronal firing when it actually tracks blood flow, so activation shows only that a region took part in a task; pairing each method's resolution with one concrete limitation scores better than generic praise.
三种生物节律
昼夜节律的周期接近 24 小时，体温在清晨最低、傍晚最高，差距约 1 摄氏度，皮质醇与褪黑素的分泌也各有峰值。Siffre 在 1962 年进入洞穴独居约两个月，他的睡眠-清醒周期逐渐拉长到 24.5 小时以上，1972 年他又在洞穴里停留了 6 个月。次昼夜节律的周期长于 24 小时，月经周期约 28 天是被引用最多的例子，季节性情感障碍则随冬季日照缩短出现。亚昼夜节律短于 24 小时，睡眠阶段大约每 90 分钟循环一次，从浅睡进入深睡再到快速眼动睡眠。判别三类节律只看周期长度，题目给出一个现象让考生归类，写出小时数或天数即可。很多学生把季节性情感障碍归进昼夜节律，它的周期是年而不是天，归类错误往往连带丢掉两个分。
Circadian rhythms run close to 24 hours, with body temperature at its lowest in the early morning and its highest in the evening, a gap of about 1 degree Celsius. Siffre spent roughly two months alone in a cave in 1962 and, stripped of all time cues, his sleep-wake cycle drifted out beyond 24.5 hours, and he returned to a cave for six months in 1972. Infradian rhythms last longer than a day, the roughly 28-day menstrual cycle being the most quoted example, while seasonal affective disorder appears as winter daylight shortens; ultradian rhythms are shorter than a day, with sleep stages cycling about every 90 minutes from light sleep through deep sleep to rapid eye movement. Classifying the three types comes down to cycle length, so a question that supplies a phenomenon expects hours or days written down; students who file seasonal affective disorder under circadian rhythms lose two marks at once because its cycle is yearly.
内源起搏器与外部授时因子
内源起搏器是体内自带的计时装置，视交叉上核位于下丘脑，是哺乳动物的主起搏器，它通过松果体调节褪黑素分泌节律。外源授时因子是环境中的时间线索，光是最强的一个，社交线索、进食时间与闹钟的作用较弱，授时因子的功能是让内源节律与外界周期对齐。动物证据里，Ralph 在 1990 年把突变仓鼠的视交叉上核移植到正常仓鼠体内，受体的活动周期随供体改变；DeCoursey 在 2000 年破坏松鼠的视交叉上核之后，节律散乱且存活率下降。这些设计支持因果关系，代价是侵入性手术与物种推广问题，松鼠的夜间活动模式不能直接套到人身上。轮班工作与跨时区飞行的干预方案都建立在这套机制上，包括用强光照射把节律前移或推后。答题时把内源与外源各写一条证据并配一条局限，比只描述视交叉上核的位置更容易拿全分。
Endogenous pacemakers are the body's internal timekeepers, and the suprachiasmatic nucleus in the hypothalamus is the master pacemaker in mammals, regulating melatonin release through the pineal gland and shaping the rise and fall of temperature and cortisol. Exogenous zeitgebers are environmental time cues, of which light is the strongest, with social cues, meal times and alarms playing weaker roles, and their function is to keep the internal rhythm aligned with the outside world rather than to generate the rhythm. In animal work, Ralph transplanted the suprachiasmatic nucleus from mutant hamsters into normal ones in 1990 and the recipients' activity cycles followed the donors, while DeCoursey found that damaging the nucleus in ground squirrels in 2000 left rhythms disorganised and cut survival. Such designs support causal claims at the cost of invasive surgery and species generalisation, since a nocturnal squirrel is not a human; shift work and jet lag interventions, including bright light timed to advance or delay the rhythm, rest on the same mechanism. Writing one piece of evidence for each side with one limitation attached scores higher than describing where the nucleus sits.
卷面时间与答题结构
AQA 的 7182 Paper 2 卷面 96 分、时长 2 小时，生物心理学所在的 Section B 占 24 分，题目从多选、短答一直到 8 分以上的长答。Edexcel 的 9PS0 Paper 1 是 2 小时 15 分、90 分、占 35%，生物心理学的分节题多在 3 到 8 分之间，先按指令词写机制，再用经典研究与当代研究支持或反驳；Paper 3 Psychological Skills 是 2 小时、80 分、占 30%，考的是把同一批研究迁移到新情境。多选与短答尽量在 20 分钟内做完，长答每 5 分留 6 到 7 分钟，最后留 5 分钟检查单位、术语与题目要求的两个部分。结构上，AO1 一段写清机制或研究的程序与结果，AO3 一段给出支持与反对的证据各一条，收尾一句写明判断。很多学生把评价写成一串研究者名字，阅卷时拿不到评价分，因为没有说清这个研究为什么支持或削弱论点。时间不够时优先保长答的结构，短答留白比长答写半截更划算。
AQA Paper 2 for 7182 carries 96 marks in two hours, and the Biopsychology section accounts for 24 of them, moving from multiple choice and short answers to extended writing worth 8 marks or more. Edexcel Paper 1 for 9PS0 runs 2 hours 15 minutes for 90 marks and 35% of the qualification, where biological psychology questions usually sit between 3 and 8 marks: describe the mechanism the command word asks for, then support or challenge it with a classic study and a contemporary one. Budget about 20 minutes for multiple choice and short answers, six to seven minutes for every 5 marks of extended writing, and keep five minutes to check units and terminology. Structure the long answer with one paragraph of mechanism or study procedure and results, one paragraph holding a piece of supporting and a piece of opposing evidence, and a closing sentence that states a judgement; a list of researcher names earns little, because it never says why the study supports or undermines the argument.
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