THS AP World History Must Know Dates Flashcards
According to anonymous sources, the starred dates are the ones most likely to show up on the AP World History Exam.
| 9636868625 | ca. 8000 BCE | Beginnings of agriculture | 0 | |
| 9636868626 | 3500 BCE | Invention of wheel, plough (Mesopotamia) and sail (Egypt) | 1 | |
| 9636868627 | 3200 BCE | Invention of writing in Mesopotamia | 2 | |
| 9636868628 | ca. 3000 BCE | Beginnings of Bronze Age - early civ's | 3 | |
| 9636868629 | 1300 BCE | Iron Age | 4 | |
| 9636868630 | 6th Century BCE | Life of Buddha, Confucius, Laozi. Beginnings of Confucianism, Buddhism, Daoism | 5 | |
| 9636975578 | 5th Cen. BCE | Greek Golden Age - Philosophers | 6 | |
| 9636980763 | 403-221 BCE | China - Warring States Period | 7 | |
| 9636868631 | 323 BCE | Alexander the Great | 8 | |
| 9636868632 | 221 BCE | Qin unified China (end of period of warring states) | 9 | |
| 9636868633 | 184 BCE | Fall of the Mauryan Dynasty | 10 | |
| 9636868634 | 32 CE | Beginnings of Christianity | 11 | |
| 9636990141 | 180 CE | End of pax romana | 12 | |
| 9636868636 | 220 CE | end of Han Dynasty | 13 | |
| 9636868637 | 312 CE | Roman Emperor Constantine converts to Christianity | 14 | |
| 9636868638 | 320 CE | Rise of the Gupta in India | 15 | |
| 9636868639 | 333 CE | Roman capital moved to Constantinople | 16 | |
| 9636868730 | 4th Century | Beginning of Trans-Saharan Trade Routes | 17 | |
| 9636868640 | 476 CE | Fall of Rome in the West ends 800 years of Roman Hegemony | 18 | |
| 9636868641 | 527 CE | Justinian rules Byzantine Empire | 19 | |
| 9636868642 | 550 CE | Fall of the Gupta in India | 20 | |
| 9636868643 | 622 CE * | Rise of Islam/beginning of Islamic calendar/hijrah | 21 | |
| 9636868644 | ca. 730 CE | Printing invented in China | 22 | |
| 9636868645 | 732 CE | Battle of Tours (end of Muslim move to France) | 23 | |
| 9636868646 | ca. 900 CE | Decline of classical Maya | 24 | |
| 9636868647 | 1054 CE | Schism of Eastern Orthodox and Latin Roman Catholic Churches divides Christianity permanently into two geographical and denominational halves | 25 | |
| 9636868648 | 1066 CE | Norman Conquest of England (William the Conqueror, the song) | 26 | |
| 9637029461 | 1071 CE | Battle of Manzikert (Seljuk Turns defeat Byzantine Army) | 27 | |
| 9636868649 | 1095 CE | 1st Crusade | 28 | |
| 9636868650 | 1206 CE * | Genghis Khan begins Mongol conquest of Asia | 29 | |
| 9636868651 | 1215 CE | Magna Carta signed by King John at Runnymede: Beginning of constitutional rule | 30 | |
| 9636868652 | 1258 CE | Mongols conquer Baghdad | 31 | |
| 9636868653 | 1271-1295 CE | Marco Polo travels | 32 | |
| 9637043485 | 1279-1368 CE | Yuan (Mongol) dynasty in China | 33 | |
| 9636868654 | 1300s | Rise of the Ottomans | 34 | |
| 9636868655 | 1324 CE | Mansa Musa's pilgrimage/hajj | 35 | |
| 9636868656 | 1325- 1349 CE | Travels of Ibn Battuta | 36 | |
| 9636868657 | 1347- 1348 CE | Bubonic Plague in Europe | 37 | |
| 9636868658 | 1405-1433 CE | Zheng He's voyages | 38 | |
| 9636868659 | 1438 CE | Rise of the Incas | 39 | |
| 9636868660 | 1453 CE* | Ottomans capture Constantinople | 40 | |
| 9637057232 | 1450s | Gutenberg's printing press in Europe | 41 | |
| 9636868661 | 1480s CE | Aztec Empire at its height | 42 | |
| 9636868662 | 1488 CE | Dias rounded Cape of Good Hope | 43 | |
| 9636868663 | 1492 CE* | Columbus sailed to Hispaniola/ Reconquista of Spain | 44 | |
| 9636868664 | 1502 CE* | First African slaves transported to Caribbean | 45 | |
| 9636868665 | 1517 CE | Martin Luther (95 Theses, Protestant Reformation) | 46 | |
| 9636868666 | 1521 CE | Cortez conquered the Aztecs | 47 | |
| 9637069817 | 1529 | 1st unsuccessful Ottoman siege of Vienna (under Suleiman) | 48 | |
| 9636868667 | 1533 CE | Pizarro conquers Inca | 49 | |
| 9636868668 | 1545 CE* | Silver discovered at Potosi | 50 | |
| 9636868669 | 1571 CE | Battle of Lepanto- naval defeat of Ottomans | 51 | |
| 9636868670 | 1588 CE | Defeat of the Spanish Armada | 52 | |
| 9636868671 | 1600 CE* | beginning of Tokugawa Shogunate/Battle of Sekigahara | 53 | |
| 9636868672 | 1607 CE | Founding of Jamestown (first slaves there in 1619) | 54 | |
| 9636868673 | 1618-1648 CE | 30 years war in Europe | 55 | |
| 9636868674 | 1644 CE | End of Ming Dynasty- rise of the Qing | 56 | |
| 9636868675 | 1652 CE | Establishment of Cape Town Colony (Dutch) | 57 | |
| 9636868676 | 1683 CE | 2nd unsuccessful Ottoman siege of Vienna | 58 | |
| 9636868677 | 1689 CE | Glorious Revolution/ English Bill of Rights | 59 | |
| 9636868678 | 1756-1763 CE | 7 years war/ French and Indian War | 60 | |
| 9636868679 | 1760 CE | About when the Industrial Revolution begins (steam locomotives, textiles, etc) | 61 | |
| 9636868680 | 1767 CE | Invention of the Spinning Jenny: man-using machines | 62 | |
| 9636868681 | 1776 CE | The American Declaration of Independence | 63 | |
| 9644685283 | 1776 CE | Smith writes "Wealth of Nations" | 64 | |
| 9636868682 | 1789 CE | French Revolution. The French Declaration of the RIghts of Man and Citizen (Olympe de Gouges' "Declaration of the Rights of Women and the Female Citizen" in 1791) | 65 | |
| 9636868683 | 1796 CE | Edward Jenner's smallpox vaccination: the first real breakthrough in combating infectious diseases | 66 | |
| 9636868684 | 1804 CE* | Haitian Independence | 67 | |
| 9636868685 | 1807 CE | British abolition of the slave trade | 68 | |
| 9644706172 | 1807-1808 CE | Janissary Revolt | 69 | |
| 9636868686 | 1810-1825 CE | Latin American independence (first Mexican Revolution) | 70 | |
| 9636868687 | 1815 CE | Metternich hosts Congress of Vienna (after Battle of Waterloo: The Napoleonic Empire ends) | 71 | |
| 9636868688 | 1839 CE | 1st Opium War between China and England | 72 | |
| 9644721096 | 1839-1878 CE | Tanzimat Reforms | 73 | |
| 9636868689 | 1848 CE | European Revolutions/ Marx and Engels write "Communist Manifesto"/ The resolutions passed at the Seneca Falls Conference | 74 | |
| 9644734292 | 1848-1849 CE | European Revolutions | 75 | |
| 9636868690 | 1853 CE | Commodore Perry opens Japan | 76 | |
| 9636868691 | 1857 CE* | Sepoy Mutiny in India | 77 | |
| 9636868692 | 1861 CE* | End of Russian serfdom by Alexander II/ Italian unification | 78 | |
| 9644745343 | 1861-1865 CE | U.S. Civil War | 79 | |
| 9644752542 | 1861-1870 CE | Italian Unification | 80 | |
| 9636868693 | 1863 CE | "Emancipation Proclamation" issued in US | 81 | |
| 9636868694 | 1871 CE | German unification | 82 | |
| 9636868695 | 1885 CE | Berlin Conference/Benz develops first petrol-driven car | 83 | |
| 9636868696 | 1893 CE | New Zealand first to give women suffrage (other nations in the Commonwealth soon follow) | 84 | |
| 9636868697 | 1896 CE | Battle of Adwa. Ethiopians fend of Italians | 85 | |
| 9636868698 | 1898 CE | Spanish-American War- Spain loses Cuba, Puerto Rico, and the Phillipines | 86 | |
| 9636868699 | 1899 CE | Boer War- Dutch under British rule in South Africa | 87 | |
| 9636868700 | 1905 CE* | Russo-Japanese War and Einstein's theory of special relativity published | 88 | |
| 9636868701 | 1910-1920* | Mexican Revolution | 89 | |
| 9636868702 | 1911* | Chinese Revolution (End of Qing) | 90 | |
| 9636868703 | 1914-1919* | World War I and Treaty of Versailles | 91 | |
| 9636868704 | 1917* | Russian Revolution | 92 | |
| 9644789013 | 1918 | Armistice of WWI | 93 | |
| 9636868731 | 1919 | Treaty of Versailles | 94 | |
| 9644798719 | 1928 | Kellogg-Briand Pact | 95 | |
| 9636868705 | 1929 | Stock Market Crash/ Great Depression | 96 | |
| 9636868706 | 1931* | Japanese invasion of Manchuria | 97 | |
| 9636868707 | 1935 | Italian Invasion of Ethiopia | 98 | |
| 9644807766 | 1937 | Japanese invasion of China | 99 | |
| 9636868708 | 1939 | German Blitzkreig on Poland | 100 | |
| 9636868709 | 1941 | Pearl Harbor | 101 | |
| 9636868710 | 1943 | Soviets defeat Germans at Stalingrad | 102 | |
| 9644820865 | 1945 (Feb) | Yalta Conference | 103 | |
| 9644828216 | 1945 (Aug) | Hiroshima/Nagasaki | 104 | |
| 9636868711 | 1945* (Sept) | End of World War II | 105 | |
| 9644842556 | 1947 (June) | Truman Doctrine | 106 | |
| 9636868712 | 1947* (Aug) | Freedom and partition of India | 107 | |
| 9636868713 | 1948* | Birth of Israel and the UN Universal Declaration of Human Rights | 108 | |
| 9644848384 | 1948-1949 | Berlin Blockade/Airlift | 109 | |
| 9644858767 | 1949 (Apr) | NATO founded | 110 | |
| 9636868714 | 1949* | Chinese Communist Revolution | 111 | |
| 9636868715 | 1950-1953 | Korean War | 112 | |
| 9636868716 | 1954 | Vietnamese defeat French at Dien Bien Phu | 113 | |
| 9644868207 | 1955 | Bandung Conference - reps from twenty-nine gov'ts of Asian & African nations in Bandung, Indonesia to discuss peace and the role of the Third World in the Cold War, economic development, and decolonization | 114 | |
| 9636868717 | 1956* | de-Stalinization/ Nationalization of Suez Canal | 115 | |
| 9636868718 | 1957* | Ghana is the first African Nation to gain independence | 116 | |
| 9644874327 | 1957 | Sputnik | 117 | |
| 9636868719 | 1959* | Cuban Revolution and invention of silicon chip (beginning of the computer age) | 118 | |
| 9636868732 | 1962 | Cuban missile crisis | 119 | |
| 9644879284 | 1966-1976 | Chinese Cultural Revolution | 120 | |
| 9636868720 | 1967 | 6 day war/ Chinese Cultural Revolution | 121 | |
| 9636868721 | 1973 | Yom Kippur War | 122 | |
| 9636868722 | 1979* | Iranian Revolution | 123 | |
| 9644893104 | 1979 | China begins "Socialist Market Economy" reforms | 124 | |
| 9636868723 | 1987 | 1st Palestinian Intifada | 125 | |
| 9636868724 | 1989* | Tiananmen Square/ fall of Berlin Wall- Collapse of Communist regimes in Europe | 126 | |
| 9636868725 | 1990 | Namibia is the last country to gain independence in Africa | 127 | |
| 9636868726 | 1991* | Fall of the USSR/ 1st Gulf War | 128 | |
| 9636868727 | 1994 | Genocide in Rwanda/ 1st all race elections in South Africa | 129 | |
| 9636868728 | 2001 | 9/11 attacks/ War in Afghanistan | 130 | |
| 9644906328 | 2003 | US invades Iraq ("Enduring Freedom") | 131 | |
| 9644919200 | 2004 | Facebook founded | 132 | |
| 9636868729 | 2007 | Great Global Recession begins | 133 | |
| 9644922019 | 2011 | Wikileaks, "Arab Spring" democracy | 134 |
AP Lang figurative language Flashcards
| 15024759113 | Euphemism | a mild or indirect word or expression substituted for one considered to be harsh or blunt when referring to something unpleasant or embarrassing EX: saying that one has "passed away" | 0 | |
| 15024759114 | oxymoron | a figure of speech in which apparently contradictory terms appear in conjunction EX: Wolfshelm eating with "ferocious delicacy" | 1 | |
| 15024759115 | metaphor | a figure or speech in which a word for a phrase is applied to an object or action to church it is not literally applicable EX: Gatsby throwing around his shirts represents him flaunting his money | 2 | |
| 15024759116 | Litotes | ironic understatement EX: Gatsby refers to the accident on the road "you see that little detour" | 3 | |
| 15024759117 | cliché | a phrase or opinion that is overused and betrays a lack or original thought it a sterotypical idea. EX: male dominance, female gold digger | 4 | |
| 15024759118 | personification | the attribution of a personal nature or human character to something nonhuman, or the representation of an abstract quality in human form. EX:A "half a dozen fingers pointed at the amputated wheel" | 5 | |
| 15024759119 | idiom | a group of words established by usage as having a meaning not deductable from those of the individual words EX: "Daisy's voice was made of money" | 6 | |
| 15024759120 | slimile | a figure of speech involving the comparison of one thing with another thing of a different kind, used to make a description word more emphatic or vivid | 7 | |
| 15024759121 | analogy | a comparison between two things, typically for the purpose of explanation or clarification EX: "Tom compared a person leaving their rich husband for a poor one to interracial marriage" | 8 | |
| 15024759122 | junxtaposation | the fact of two things being close together or places with contrasting effect. EX: The heat of ch.7 is juxtaposed with Daisy's phrase "you look so cool" | 9 | |
| 15024759123 | antithesis | a person or thing that is the direct opposite of someone or something else EX: East Egg and the Valley of the Ashes, so therefore Tom and George live... | 10 | |
| 15024759124 | synecdocge | a figure of speech in which a part is made to represent the whole EX: Owl eyes is reffered to by his glasses | 11 | |
| 15024759125 | metonymy | the substitution of the name of an attribute if adjunct for that thing ment EX: the use of the East Egg and West Egg as a reference to the people that inhabit it | 12 | |
| 15024759126 | paradox | a seemingly absurb over self contradictory statement or a proposition that when invested or explained may prove to be well founded or true EX: I like large parties, they are so intimate | 13 | |
| 15024759127 | apostrophe | when the speaker speaks directly to someone who is not present or is dead, or speak to an inanimate object. EX: "romeo o Romeo where for art thou" | 14 | |
| 15024759128 | hyperbole | exaggerate statements or claims not ment to be taken lightly EX: I've been lying on that couch for as long as I can remember | 15 |
AP Vocab Flashcards
| 14971245950 | jurar | to swear | 0 | |
| 14971251460 | jaleo | uproar | 1 | |
| 14971261927 | arrepentir | to repent | 2 | |
| 14971267620 | aprovechar | to take advantage of (an opportunity) | 3 | |
| 14971267621 | ocultar | to hide | 4 | |
| 14971277052 | pillar | to plunder | 5 | |
| 14971280572 | bajón | decline | 6 | |
| 14971289490 | sobrar | to have in excess | 7 | |
| 14971294161 | ateo | atheist | 8 | |
| 14971363720 | cotidianidad, cotidiano | daily living, daily | 9 | |
| 14971356682 | venenar | to poison | 10 | |
| 14971374681 | dotado | gifted | 11 | |
| 14971378831 | engañoso | decietful | 12 | |
| 14971384132 | Autoconocimiento | self-knowledge | 13 | |
| 14971388432 | sesgada | biased | 14 | |
| 14971392796 | retos | challenges | 15 | |
| 14971392797 | forjando | forging | 16 | |
| 14971400548 | componente | component | 17 | |
| 14971405676 | mercer | to deserve | 18 | |
| 14971405677 | plantearse | to consider; to pose (a question) | 19 | |
| 14971413266 | agotador | exhausting | 20 | |
| 14971418349 | pedagógico | educational | 21 | |
| 14971427462 | adquirir | to acquire | 22 | |
| 14971431787 | curaduría | curatorship | 23 | |
| 14971437627 | balas | bullets | 24 | |
| 14971444805 | auge (el) | peak | 25 | |
| 14971450279 | contundente | convincing, conclusive | 26 | |
| 14971453807 | mermar | to reduce | 27 | |
| 14971463123 | retornar | to return | 28 | |
| 14971468420 | surtir | to produce | 29 | |
| 14971478144 | entretejer | to interweave | 30 | |
| 14971482147 | maniatado | handcuffed | 31 | |
| 14971487218 | vencido | conquered | 32 | |
| 14971493122 | cifra | figure | 33 | |
| 14971499609 | preponderante | preponderant | 34 | |
| 14971499610 | teoría | theory | 35 | |
| 14971516625 | alcanzar | to reach | 36 | |
| 14971510182 | vertiginoso | dizzying | 37 | |
| 14971523857 | atraidos | attracted | 38 | |
| 14971530564 | argamasa | cement | 39 | |
| 14971534402 | desmentir | to deny | 40 |
AP Human Geography - Religion Flashcards
Vocabulary flashcards from chapter 6 on religion
| 8475958884 | Religion | a system of beliefs and practices that attempts to order life in terms of culturally perceived ultimate priorities | ![]() | 0 |
| 8475958885 | Monotheistic Religion | belief system in which one supreme being is revered as creator and arbiter of all that exists in the universe | ![]() | 1 |
| 8475958886 | Polytheistic Religion | belief system in which multiple deities are revered as creators and arbiters of all that exists in the universe | ![]() | 2 |
| 8475958887 | Animistic Religion | the belief that inanimate objects, such as hills, trees, rocks, rivers, and other elements of the natural landscape, possess souls and can help or hinder human efforts on Earth | 3 | |
| 8475958888 | Universalizing Religion | A religion that appeals to all people and in some cases great effort is undertake in evangelism and missionary work. | 4 | |
| 8475958889 | Ethnic Religion | a religion that is particular to one, culturally distinct, group of people. | 5 | |
| 8475958890 | Hinduism | one of the oldest religions in the modern world, dating back over 4000 years, and originating in the Indus River Valley of what is today part of Pakistan... is unique among the world's religions in that it does not have a single founder, a single theology, or agreement on its origins. | ![]() | 6 |
| 8475958891 | Caste System | the strict social segregation of people—specifically in India's Hindu society—on the basis of ancestry and occupation | 7 | |
| 8475958892 | Buddhism | religion founded in the sixth century BCE and characterized by the belief that enlightenment would come through knowledge, especially self-knowledge; elimination of greed, craving, and desire; complete honesty; and never hurting another person or animal. | ![]() | 8 |
| 8475958893 | Confucianism | a philosophy of ethics, education, and public service based on the writings of Confucius and traditionally thought of as one of the core elements of Chinese culture. | ![]() | 9 |
| 8475958894 | Judaism | religion with its roots in the teachings of Abraham (from Ur), who is credit with uniting his people to worship only one God. | ![]() | 10 |
| 8475958895 | Diaspora | a term describing forceful or voluntary dispersal of a people from their homeland to a new place. Originally denoting the dispersal of Jews. | ![]() | 11 |
| 8475958896 | Zionism | the movement to unite the Jewish people of the diaspora and to establish a national homeland for them in the promised land | ![]() | 12 |
| 8475958897 | Christianity | religion based on the teachings of Jesus. According to Christian teaching, Jesus is the son of God, placed on Earth to teach people how to live according to God's plan | ![]() | 13 |
| 8475958898 | Eastern Orthodox Church (eoc) | one of the three major branches of Christianity, In 1054 CE, Christianity was divided along that same line when the church, centered in Constantinople; and the Roman Catholic Church, centered in Rome, split. | ![]() | 14 |
| 8475958899 | Protestant | one of three major branches of Christianity, many adherents to the Catholic church began to question the role of religion in their lives and opened the door to the Protestant Reformation in 1517 | ![]() | 15 |
| 8475958900 | Islam | the youngest of the major world religions, Islam is based on the teachings of Muhammad, born in Mecca in 571 CE. According to the teaching, Muhammad received the truth directly from Allah in a series of revelations during which Muhammad spoke the verses of the Qu'ran (Koran), the Islamic holy book. | ![]() | 16 |
| 8475958901 | Sunnis | Adherents to the largest branch of Islam, called the orthodox or traditionalist. They believe in the effectiveness of family and community in the solution of life's problems, and they differ from the Shiites in accepting the traditions of Muhammad as authoritative | 17 | |
| 8475958902 | Shiites | adherents of one of the two main divisions of Islam.... represent the Persian (Iranian) variation of Islam and believe in the infallibility and divine right to authority of the Imams, descendants of Ali (based largely in Iraq & Iran) | 18 | |
| 8475958903 | Indigenous Religions | belief systems and philosophies practiced and traditionally passed from generation to generation among peoples within a ... tribe or group | 19 | |
| 8475958904 | Minarets | tower attached to a Muslim mosque, having one or more projecting balconies from which a crier call Muslims to prayer | ![]() | 20 |
| 8475958905 | Hajj | the Muslim pilgrimage to Mecca, the birthplace of Muhammad | ![]() | 21 |
| 8475958906 | Religious Fundamentalism | religious movement whose objectives are to return to the foundations of the faith and to influence state policy | 22 | |
| 8475958907 | Religious Extremism | religious fundamentalism carried to the point of violence | 23 | |
| 8475958908 | Shari'a Laws | The system of Islamic law, sometimes called Quranic law. Unlike most western systems of law that are based on legal precedence, sharia is based on varying degrees of interpretation of the Quran. | 24 | |
| 8475958909 | Jihad | a doctrine within Islam. Commonly translated as "Holy War," Jihad represents either a personal or collective struggle on the part of Muslims to live up to the religious standards set by the Qu'ran | 25 |
Flashcards
AP Psychology Unit 4 Flashcards
Advanced Placement Psychology
Enterprise High School, Redding, CA
All terms from Myers Psychology for AP (BFW Worth, 2011)
| 11646862562 | sensation | the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment. | 0 | |
| 11646862563 | perception | the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events. | 1 | |
| 11646862564 | bottom-up processing | analysis that begins with the sensory receptors and works up to the brain's integration of sensory information. | 2 | |
| 11646862565 | top-down processing | information processing guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectations. | 3 | |
| 11646862566 | selective attention | the focusing of conscious awareness on a particular stimulus. | 4 | |
| 11646862567 | inattentional blindness | failing to see visible objects when our attention is directed elsewhere. | 5 | |
| 11646862568 | change blindness | failing to notice changes in the environment. | 6 | |
| 11646862569 | psychophysics | the study of relationships between the physical characteristics of stimuli, such as their intensity, and our psychological experience of them. | 7 | |
| 11646862570 | absolute threshold | the minimum stimulation needed to detect a particular stimulus 50 percent of the time. | 8 | |
| 11646862571 | signal detection theory | a theory predicting how and when we detect the presence of a faint stimulus (signal) amid background stimulation (noise). Assumes there is no single absolute threshold and that detection depends partly on a person's experience, expectations, motivation, and alertness. | 9 | |
| 11646862572 | subliminal | below one's absolute threshold for conscious awareness | 10 | |
| 11646862573 | priming | the activation, often unconsciously, of certain associations, thus predisposing one's perception, memory, or response. | 11 | |
| 11646862574 | difference threshold | the minimum difference between two stimuli required for detection 50 percent of the time. Also called the just noticeable difference (jnd). | 12 | |
| 11646862575 | Weber's law | the principle that, to be perceived as different, two stimuli must differ by a constant percentage (rather than a constant amount). | 13 | |
| 11646862576 | sensory adaptation | diminished sensitivity as a consequence of constant stimulation. | 14 | |
| 11646862577 | transduction | conversion of one form of energy into another. In sensation, the transforming of stimulus energies, such as sights, sounds, and smells, into neural impulses our brains can interpret. | 15 | |
| 11646862578 | wavelength | the distance from the peak of one light or sound wave to the peak of the next. Electromagnetic versions of this vary from the short blips of cosmic rays to the long pulses of radio transmission. | 16 | |
| 11646862579 | hue | the dimension of color that is determined by the wavelength of light; what we know as the color names blue, green, and so forth. | 17 | |
| 11646862580 | intensity | the amount of energy in a light or sound wave, which we perceive as brightness or loudness, as determined by the wave's amplitude. | 18 | |
| 11646862581 | pupil | the adjustable opening in the center of the eye through which light enters. | 19 | |
| 11646862582 | iris | a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening. | 20 | |
| 11646862583 | lens | the transparent structure behind the pupil that changes shape to help focus images on the retina. | 21 | |
| 11646862584 | retina | the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information. | 22 | |
| 11646862585 | accomodation | the process by which the eye's lens changes shape to focus near or far objects on the retina. | 23 | |
| 11646862586 | rods | retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don't respond. | 24 | |
| 11646862587 | cones | retinal receptor cells that are concentrated near the center of the retina and that function in daylight or in well-lit conditions. These detect fine detail and give rise to color sensations. | 25 | |
| 11646862588 | optic nerve | the nerve that carries neural impulses from the eye to the brain. | 26 | |
| 11646862589 | blind spot | the point at which the optic nerve leaves the eye and no receptor cells are located there. | 27 | |
| 11646862590 | fovea | the central focal point in the retina, around which the eye's cones cluster. | 28 | |
| 11646862591 | feature detectors | nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement. | 29 | |
| 11646862592 | parallel processing | the processing of many aspects of a problem simultaneously; the brain's natural mode of information processing for many functions, including vision. Contrasts with the step-by-step (serial) processing of most computers and of conscious problem solving. | 30 | |
| 11646862593 | Young-Helmholtz trichromatic (three-color) theory | the theory that the retina contains three different color receptors—one most sensitive to red, one to green, one to blue—which, when stimulated in combination, can produce the perception of any color. | 31 | |
| 11646862594 | opponent-process theory | the theory that opposing retinal processes (red-green, yellow-blue, white-black) enable color vision. For example, some cells are stimulated by green and inhibited by red; others are stimulated by red and inhibited by green. | 32 |
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