In this lecture we shall be concerned with a very general characteristic which broadly, though not absolutely, distinguishes the behaviour of living organisms from that of dead matter. The characteristic in question is this:

The response of an organism to a given stimulus¹ is very often dependent upon the past history of the organism, and not merely upon the stimulus and the HITHERTO DISCOVERABLE present state of the organism.

This characteristic is embodied² in the saying "a burnt child fears the fire." The burn may have left no visible traces, yet it modifies the reaction of the child in the presence of fire. It is customary to assume that, in such cases, the past operates by modifying the structure of the brain, not directly. I have no wish to suggest that this hypothesis is false; I wish only to point out that it is a hypothesis. At the end of the present lecture I shall examine the grounds in its favour. If we confine ourselves to facts which have been actually observed, we must say that past occurrences, in addition to the present stimulus and the present ascertainable³ condition of the organism, enter into the causation of the response.

The characteristic is not wholly confined to living organisms. For example, magnetized steel looks just like steel which has not been magnetized, but its behaviour is in some ways different. In the case of dead matter, however, such phenomena⁴ are less frequent and important than in the case of living organisms, and it is far less difficult to invent satisfactory hypotheses as to the microscopic⁵ changes of structure which mediate⁶ between the past occurrence and the present changed response. In the case of living organisms, practically everything that is distinctive⁷ both of their physical and of their mental behaviour is bound up with this persistent

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1 stimulus
n.刺激，刺激物，促进因素，引起兴奋的事物
参考例句：
Regard each failure as a stimulus to further efforts.把每次失利看成对进一步努力的激励。 Light is a stimulus to growth in plants.光是促进植物生长的一个因素。

2 embodied
v.表现( embody的过去式和过去分词 )；象征；包括；包含
参考例句：
a politician who embodied the hopes of black youth 代表黑人青年希望的政治家 The heroic deeds of him embodied the glorious tradition of the troops. 他的英雄事迹体现了军队的光荣传统。 来自《简明英汉词典》

3 ascertainable
adj.可确定（探知），可发现的
参考例句：
Is the exact value of the missing jewels ascertainable? 那些不知去向之珠宝的确切价值弄得清楚吗？ 来自辞典例句 Even a schoolboy's jape is supposed to have some ascertainable point. 即使一个小男生的戏言也可能有一些真义。 来自互联网

4 phenomena
n.现象
参考例句：
Ade couldn't relate the phenomena with any theory he knew.艾德无法用他所知道的任何理论来解释这种现象。 The object of these experiments was to find the connection,if any,between the two phenomena.这些实验的目的就是探索这两种现象之间的联系，如果存在着任何联系的话。

5 microscopic
adj.微小的，细微的，极小的，显微的
参考例句：
It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。 A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。

6 mediate
vi.调解，斡旋；vt.经调解解决；经斡旋促成
参考例句：
The state must mediate the struggle for water resources.政府必须通过调解来解决对水资源的争夺。 They may be able to mediate between parties with different interests.他们也许能在不同利益政党之间进行斡旋。

7 distinctive
adj.特别的，有特色的，与众不同的
参考例句：
She has a very distinctive way of walking.她走路的样子与别人很不相同。 This bird has several distinctive features.这个鸟具有几种突出的特征。

8 persistent
adj.坚持不懈的，执意的；持续的
参考例句：
Albert had a persistent headache that lasted for three days.艾伯特连续头痛了三天。 She felt embarrassed by his persistent attentions.他不时地向她大献殷勤，使她很难为情。

9 logic
n.逻辑(学)；逻辑性
参考例句：
What sort of logic is that?这是什么逻辑？ I don't follow the logic of your argument.我不明白你的论点逻辑性何在。

10 advantageous
adj.有利的；有帮助的
参考例句：
Injections of vitamin C are obviously advantageous.注射维生素C显然是有利的。 You're in a very advantageous position.你处于非常有利的地位。

11 derived
vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取
参考例句：
Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》 He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》

12 modifications
n.缓和( modification的名词复数 )；限制；更改；改变
参考例句：
The engine was pulled apart for modifications and then reassembled. 发动机被拆开改型，然后再组装起来。 来自《简明英汉词典》 The original plan had undergone fairly extensive modifications. 原计划已经作了相当大的修改。 来自《简明英汉词典》

13 modification
n.修改，改进，缓和，减轻
参考例句：
The law,in its present form,is unjust;it needs modification.现行的法律是不公正的，它需要修改。 The design requires considerable modification.这个设计需要作大的修改。

14 smelt
v.熔解，熔炼；n.银白鱼，胡瓜鱼
参考例句：
Tin is a comparatively easy metal to smelt.锡是比较容易熔化的金属。 Darby was looking for a way to improve iron when he hit upon the idea of smelting it with coke instead of charcoal.达比一直在寻找改善铁质的方法，他猛然想到可以不用木炭熔炼，而改用焦炭。

15 recollect
v.回忆，想起，记起，忆起，记得
参考例句：
He tried to recollect things and drown himself in them.他极力回想过去的事情而沉浸于回忆之中。 She could not recollect being there.她回想不起曾经到过那儿。

16 maxim
n.格言，箴言
参考例句：
Please lay the maxim to your heart.请把此格言记在心里。 "Waste not,want not" is her favourite maxim.“不浪费则不匮乏”是她喜爱的格言。

17 mazes
迷宫( maze的名词复数 )； 纷繁复杂的规则； 复杂难懂的细节； 迷宫图
参考例句：
The mazes of the dance were ecstatic. 跳舞那种错综曲折，叫人快乐得如登九天。 For two hours did this singlehearted and simpleminded girl toil through the mazes of the forest. 这位心地单纯的傻姑娘在林间曲径中艰难地走了两个来小时。

18 habitual
adj.习惯性的；通常的，惯常的
参考例句：
He is a habitual criminal.他是一个惯犯。 They are habitual visitors to our house.他们是我家的常客。

19 stimuli
n.刺激（物）
参考例句：
It is necessary to curtail or alter normally coexisting stimuli.必需消除或改变正常时并存的刺激。 My sweat glands also respond to emotional stimuli.我的汗腺对情绪刺激也能产生反应。

20 spoke
n.（车轮的）辐条；轮辐；破坏某人的计划；阻挠某人的行动 v.讲，谈（speak的过去式）；说；演说；从某种观点来说
参考例句：
They sourced the spoke nuts from our company.他们的轮辐螺帽是从我们公司获得的。 The spokes of a wheel are the bars that connect the outer ring to the centre.辐条是轮子上连接外圈与中心的条棒。

21 purely
adv.纯粹地，完全地
参考例句：
I helped him purely and simply out of friendship.我帮他纯粹是出于友情。 This disproves the theory that children are purely imitative.这证明认为儿童只会单纯地模仿的理论是站不住脚的。

22 sensational
adj.使人感动的，非常好的，轰动的，耸人听闻的
参考例句：
Papers of this kind are full of sensational news reports.这类报纸满是耸人听闻的新闻报道。 Their performance was sensational.他们的演出妙极了。

23 subjectively
主观地； 臆
参考例句：
Subjectively, the demand of interest is the desire of human being. 荀子所说的对利的需要从主观上说就是人的欲望。 A sound also has an amplitude, a property subjectively heard as loudness. 声音有振幅，振幅的主观感觉是声音的大小。

24 instinctive
adj.(出于)本能的；直觉的；(出于)天性的
参考例句：
He tried to conceal his instinctive revulsion at the idea.他试图饰盖自己对这一想法本能的厌恶。 Animals have an instinctive fear of fire.动物本能地怕火。

25 correlation
n.相互关系，相关，关连
参考例句：
The second group of measurements had a high correlation with the first.第二组测量数据与第一组高度相关。 A high correlation exists in America between education and economic position.教育和经济地位在美国有极密切的关系。

26 entirely
ad.全部地，完整地；完全地，彻底地
参考例句：
The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。 His life was entirely given up to the educational work. 他的一生统统献给了教育工作。

27 astonishment
n.惊奇，惊异
参考例句：
They heard him give a loud shout of astonishment.他们听见他惊奇地大叫一声。 I was filled with astonishment at her strange action.我对她的奇怪举动不胜惊异。

28 psychology
n.心理，心理学，心理状态
参考例句：
She has a background in child psychology.她受过儿童心理学的教育。 He studied philosophy and psychology at Cambridge.他在剑桥大学学习哲学和心理学。

29 vaguely
adv.含糊地，暖昧地
参考例句：
He had talked vaguely of going to work abroad.他含糊其词地说了到国外工作的事。 He looked vaguely before him with unseeing eyes.他迷迷糊糊的望着前面，对一切都视而不见。

30 primal
adj.原始的；最重要的
参考例句：
Jealousy is a primal emotion.嫉妒是最原始的情感。 Money was a primal necessity to them.对于他们，钱是主要的需要。

31 embody
vt.具体表达，使具体化；包含，收录
参考例句：
The latest locomotives embody many new features. 这些最新的机车具有许多新的特色。 Hemingway's characters plainly embody his own values and view of life.海明威笔下的角色明确反映出他自己的价值观与人生观。

32 dealing
n.经商方法，待人态度
参考例句：
This store has an excellent reputation for fair dealing.该商店因买卖公道而享有极高的声誉。 His fair dealing earned our confidence.他的诚实的行为获得我们的信任。

33 equilibrium
n.平衡，均衡，相称，均势，平静
参考例句：
Change in the world around us disturbs our inner equilibrium.我们周围世界的变化扰乱了我们内心的平静。 This is best expressed in the form of an equilibrium constant.这最好用平衡常数的形式来表示。

34 specially
adv.特定地；特殊地；明确地
参考例句：
They are specially packaged so that they stack easily.它们经过特别包装以便于堆放。 The machine was designed specially for demolishing old buildings.这种机器是专为拆毁旧楼房而设计的。

35 simultaneously
adv.同时发生地，同时进行地
参考例句：
The radar beam can track a number of targets almost simultaneously.雷达波几乎可以同时追着多个目标。 The Windows allow a computer user to execute multiple programs simultaneously.Windows允许计算机用户同时运行多个程序。

36 isolated
adj.与世隔绝的
参考例句：
His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。 Patients with the disease should be isolated. 这种病的患者应予以隔离。

37 recurs
再发生，复发( recur的第三人称单数 )
参考例句：
This theme recurs several times throughout the book. 这一主题在整部书里出现了好几次。 Leap year recurs every four years. 每四年闰年一次。

38 innate
adj.天生的，固有的，天赋的
参考例句：
You obviously have an innate talent for music.你显然有天生的音乐才能。 Correct ideas are not innate in the mind.人的正确思想不是自己头脑中固有的。

39 formulates
v.构想出( formulate的第三人称单数 )；规划；确切地阐述；用公式表示
参考例句：
Article Eleven SEPA formulates the overall plans of the training. 第十一条环保总局统筹规划培训工作。 来自互联网 This paper carries on the experimental analysis and formulates some anti-disturbance measures. 文章对电磁干扰进行了实验分析，并有针对性地制定一些抗干扰措施。 来自互联网

40 formulate
v.用公式表示；规划；设计；系统地阐述
参考例句：
He took care to formulate his reply very clearly.他字斟句酌，清楚地做了回答。 I was impressed by the way he could formulate his ideas.他陈述观点的方式让我印象深刻。

41 formerly
adv.从前，以前
参考例句：
We now enjoy these comforts of which formerly we had only heard.我们现在享受到了过去只是听说过的那些舒适条件。 This boat was formerly used on the rivers of China.这船从前航行在中国内河里。

42 recurrence
n.复发，反复，重现
参考例句：
More care in the future will prevent recurrence of the mistake.将来的小心可防止错误的重现。 He was aware of the possibility of a recurrence of his illness.他知道他的病有可能复发。

43 alteration
n.变更，改变；蚀变
参考例句：
The shirt needs alteration.这件衬衣需要改一改。 He easily perceived there was an alteration in my countenance.他立刻看出我的脸色和往常有些不同。

44 invoked
v.援引( invoke的过去式和过去分词 )；行使（权利等）；祈求救助；恳求
参考例句：
It is unlikely that libel laws will be invoked. 不大可能诉诸诽谤法。 She had invoked the law in her own defence. 她援引法律为自己辩护。 来自《简明英汉词典》

45 physiology
n.生理学，生理机能
参考例句：
He bought a book about physiology.他买了一本生理学方面的书。 He was awarded the Nobel Prize for achievements in physiology.他因生理学方面的建树而被授予诺贝尔奖。

46 disturbances
n.骚乱( disturbance的名词复数 )；打扰；困扰；障碍
参考例句：
The government has set up a commission of inquiry into the disturbances at the prison. 政府成立了一个委员会来调查监狱骚乱事件。 Extra police were called in to quell the disturbances. 已调集了增援警力来平定骚乱。

47 recollecting
v.记起，想起( recollect的现在分词 )
参考例句：
Once wound could heal slowly, my Bo Hui was recollecting. 曾经的伤口会慢慢地愈合，我卜会甾回忆。 来自互联网 I am afraid of recollecting the life of past in the school. 我不敢回忆我在校过去的生活。 来自互联网

48 standing
n.持续，地位；adj.永久的，不动的，直立的，不流动的
参考例句：
After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。 They're standing out against any change in the law.他们坚决反对对法律做任何修改。

49 remains
n.剩余物，残留物；遗体，遗迹
参考例句：
He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。 The remains of the meal were fed to the dog.残羹剩饭喂狗了。

50 embodying
v.表现( embody的现在分词 )；象征；包括；包含
参考例句：
Every instrument constitutes an independent contract embodying a payment obligation. 每张票据都构成一份独立的体现支付义务的合同。 来自口语例句 Fowth, The aesthetical transcendency and the beauty embodying the man's liberty. \" 第四部分：审美的超越和作为人类自由最终体现的“美”。 来自互联网

51 interval
n.间隔，间距；幕间休息，中场休息
参考例句：
The interval between the two trees measures 40 feet.这两棵树的间隔是40英尺。 There was a long interval before he anwsered the telephone.隔了好久他才回了电话。

52 disposition
n.性情，性格；意向，倾向；排列，部署
参考例句：
He has made a good disposition of his property.他已对财产作了妥善处理。 He has a cheerful disposition.他性情开朗。

53 dependence
n.依靠，依赖；信任，信赖；隶属
参考例句：
Doctors keep trying to break her dependence of the drug.医生们尽力使她戒除毒瘾。 He was freed from financial dependence on his parents.他在经济上摆脱了对父母的依赖。

54 psychical
adj.有关特异功能现象的；有关特异功能官能的；灵魂的；心灵的
参考例句：
Conclusion: The Liuhe-lottery does harm to people, s psychical health and should be for bidden. 结论：“六合彩”赌博有害人们心理卫生，应予以严禁。 来自互联网

55 unwilling
adj.不情愿的
参考例句：
The natives were unwilling to be bent by colonial power.土著居民不愿受殖民势力的摆布。 His tightfisted employer was unwilling to give him a raise.他那吝啬的雇主不肯给他加薪。

56 brute
n.野兽，兽性
参考例句：
The aggressor troops are not many degrees removed from the brute.侵略军简直象一群野兽。 That dog is a dangerous brute.It bites people.那条狗是危险的畜牲，它咬人。

57 solely
adv.仅仅，唯一地
参考例句：
Success should not be measured solely by educational achievement.成功与否不应只用学业成绩来衡量。 The town depends almost solely on the tourist trade.这座城市几乎完全靠旅游业维持。

58 validly
正当地，妥当地
参考例句：
There are many ways of doing science validly appropriate in different situations. 在不同场合有很多种方式正当地搞科学。 This may not validly be done. 这个也许得不到有效的处理。

59 alleged
a.被指控的，嫌疑的
参考例句：
It was alleged that he had taken bribes while in office. 他被指称在任时收受贿赂。 alleged irregularities in the election campaign 被指称竞选运动中的不正当行为

60 pointed
adj.尖的，直截了当的
参考例句：
He gave me a very sharp pointed pencil.他给我一支削得非常尖的铅笔。 She wished to show Mrs.John Dashwood by this pointed invitation to her brother.她想通过对达茨伍德夫人提出直截了当的邀请向她的哥哥表示出来。

61 physiologists
n.生理学者( physiologist的名词复数 )；生理学( physiology的名词复数 )；生理机能
参考例句：
Quite unexpectedly, vertebrate physiologists and microbial biochemists had found a common ground. 出乎意外，脊椎动物生理学家和微生物生化学家找到了共同阵地。 来自辞典例句 Physiologists are interested in the workings of the human body. 生理学家对人体的功能感兴趣。 来自辞典例句

62 breach
n.违反，不履行；破裂；vt.冲破，攻破
参考例句：
We won't have any breach of discipline.我们不允许任何破坏纪律的现象。 He was sued for breach of contract.他因不履行合同而被起诉。

63 symposium
n.讨论会，专题报告会；专题论文集
参考例句：
What have you learned from the symposium?你参加了这次科学讨论会有什么体会？ The specialists and scholars present at the symposium come from all corners of the country.出席研讨会的专家学者们来自全国各地。

64 conclusively
adv.令人信服地，确凿地
参考例句：
All this proves conclusively that she couldn't have known the truth. 这一切无可置疑地证明她不可能知道真相。 来自《简明英汉词典》 From the facts,he was able to determine conclusively that the death was not a suicide. 根据这些事实他断定这起死亡事件并非自杀。 来自《简明英汉词典》

65 conclusive
adj.最后的，结论的；确凿的，消除怀疑的
参考例句：
They produced some fairly conclusive evidence.他们提供了一些相当确凿的证据。 Franklin did not believe that the French tests were conclusive.富兰克林不相信这个法国人的实验是结论性的。

66 physiological
adj.生理学的，生理学上的
参考例句：
He bought a physiological book.他买了一本生理学方面的书。 Every individual has a physiological requirement for each nutrient.每个人对每种营养成分都有一种生理上的需要。

67 possessed
adj.疯狂的；拥有的，占有的
参考例句：
He flew out of the room like a man possessed.他像着了魔似地猛然冲出房门。 He behaved like someone possessed.他行为举止像是魔怔了。

68 maxims
n.格言，座右铭( maxim的名词复数 )
参考例句：
Courts also draw freely on traditional maxims of construction. 法院也自由吸收传统的解释准则。 来自英汉非文学 - 行政法 There are variant formulations of some of the maxims. 有些准则有多种表达方式。 来自辞典例句

69 detailed
adj.详细的，详尽的，极注意细节的，完全的
参考例句：
He had made a detailed study of the terrain.他对地形作了缜密的研究。 A detailed list of our publications is available on request.我们的出版物有一份详细的目录备索。

70 previously
adv.以前，先前（地）
参考例句：
The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。 Let me digress for a moment and explain what had happened previously.让我岔开一会儿，解释原先发生了什么。

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