Eugenics is a set of beliefs and practices that aim to improve the genetic quality of a human population by excluding certain genetic groups judged to be inferior, promoting other genetic groups judged to be superior. The definition of eugenics has been a matter of debate since the term was coined by Francis Galton in 1883; the concept predates the term. Frederick Osborn's 1937 journal article "Development of a Eugenic Philosophy" framed it as a social philosophy—a philosophy with implications for social order; that definition is not universally accepted. Osborn advocated for higher rates of sexual reproduction among people with desired traits or reduced rates of sexual reproduction or sterilization of people with less-desired or undesired traits. Alternatively, by 2014, gene selection was made possible through advances in genome editing, leading to what is sometimes called new eugenics known as "neo-eugenics", "consumer eugenics", or "liberal eugenics". While eugenic principles have been practiced as early as ancient Greece, the contemporary history of eugenics began in the early 20th century, when a popular eugenics movement emerged in the United Kingdom, spread to many countries, including the United States and most European countries.
In this period, eugenic ideas were espoused across the political spectrum. Many countries adopted eugenic policies, intended to improve the quality of their populations' genetic stock; such programs included both positive measures, such as encouraging individuals deemed "fit" to reproduce, negative measures, such as marriage prohibitions and forced sterilization of people deemed unfit for reproduction. Those deemed "unfit to reproduce" included people with mental or physical disabilities, people who scored in the low ranges on different IQ tests, criminals and "deviants," and members of disfavored minority groups; the eugenics movement became associated with Nazi Germany and the Holocaust when many of the defendants at the Nuremberg trials attempted to justify their human rights abuses by claiming there was little difference between the Nazi eugenics programs and the U. S. eugenics programs. In the decades following World War II, with the institution of human rights, many countries began to abandon eugenics policies, although some Western countries, the United States and Sweden among them, continued to carry out forced sterilizations.
Since the 1980s and 1990s, with new assisted reproductive technology procedures available, such as gestational surrogacy, preimplantation genetic diagnosis, cytoplasmic transfer, fear has emerged about the possible revival of a more potent form of eugenics after decades of promoting human rights. The State of California Legislature and Governor passed a form of negative eugenics into law via SB 1095, resulting in a State law requiring the screening for "any disease" "detectable in the blood" prior to birth; the bill, still law in California, has been regarded as a form of scientific racism, though its proponents continue to claim that it is necessary. A system was proposed by California Senator Skinner to compensate victims of the well-documented examples of prison sterilizations resulting from California's eugenics programs, but this did not pass by the bill's 2018 deadline in the Legislature. A major criticism of eugenics policies is that, regardless of whether negative or positive policies are used, they are susceptible to abuse because the genetic selection criteria are determined by whichever group has political power at the time.
Furthermore, negative eugenics in particular is criticized by many as a violation of basic human rights, which include the right to reproduce. Another criticism is that eugenics policies lead to a loss of genetic diversity, thereby resulting in inbreeding depression due to a loss of genetic variation, yet another criticism of contemporary eugenics policies is that they propose to permanently and artificially disrupt millions of years of evolution, that attempting to create genetic lines "clean" of "disorders" can have far-reaching ancillary downstream effects in the genetic ecology, including negative effects on immunity and species resilience. The concept of positive eugenics to produce better human beings has existed at least since Plato suggested selective mating to produce a guardian class. In Sparta, every Spartan child was inspected by the council of elders, the Gerousia, which determined if the child was fit to live or not. In the early years of ancient Rome, a Roman father was obliged by law to kill his child if they were physically disabled.
Among the ancient Germanic tribes, people who were cowardly, unwarlike or "stained with abominable vices" were put to death by being drowned in swamps. The first formal negative eugenics, a legal provision against the birth of inferior human beings, was promulgated in Western European culture by the Christian Council of Agde in 506, which forbade marriage between cousins; this idea was promoted by William Goodell who advocated the castration and spaying of the insane. The idea of a modern project of improving the human population through a statistical understanding of heredity used to encourage good breeding was developed by Francis Galton and was linked to Darwinism and his theory of natural selection. Galton had read his half-cousin Charles Darwin's theory of
Boston is the capital and most populous city of the Commonwealth of Massachusetts in the United States. The city proper covers 48 square miles with an estimated population of 685,094 in 2017, making it the most populous city in New England. Boston is the seat of Suffolk County as well, although the county government was disbanded on July 1, 1999; the city is the economic and cultural anchor of a larger metropolitan area known as Greater Boston, a metropolitan statistical area home to a census-estimated 4.8 million people in 2016 and ranking as the tenth-largest such area in the country. As a combined statistical area, this wider commuting region is home to some 8.2 million people, making it the sixth-largest in the United States. Boston is one of the oldest cities in the United States, founded on the Shawmut Peninsula in 1630 by Puritan settlers from England, it was the scene of several key events of the American Revolution, such as the Boston Massacre, the Boston Tea Party, the Battle of Bunker Hill, the Siege of Boston.
Upon gaining U. S. independence from Great Britain, it continued to be an important port and manufacturing hub as well as a center for education and culture. The city has expanded beyond the original peninsula through land reclamation and municipal annexation, its rich history attracts many tourists, with Faneuil Hall alone drawing more than 20 million visitors per year. Boston's many firsts include the United States' first public park, first public or state school and first subway system; the Boston area's many colleges and universities make it an international center of higher education, including law, medicine and business, the city is considered to be a world leader in innovation and entrepreneurship, with nearly 2,000 startups. Boston's economic base includes finance and business services, information technology, government activities. Households in the city claim the highest average rate of philanthropy in the United States; the city has one of the highest costs of living in the United States as it has undergone gentrification, though it remains high on world livability rankings.
Boston's early European settlers had first called the area Trimountaine but renamed it Boston after Boston, England, the origin of several prominent colonists. The renaming on September 7, 1630, was by Puritan colonists from England who had moved over from Charlestown earlier that year in quest for fresh water, their settlement was limited to the Shawmut Peninsula, at that time surrounded by the Massachusetts Bay and Charles River and connected to the mainland by a narrow isthmus. The peninsula is thought to have been inhabited as early as 5000 BC. In 1629, the Massachusetts Bay Colony's first governor John Winthrop led the signing of the Cambridge Agreement, a key founding document of the city. Puritan ethics and their focus on education influenced its early history. Over the next 130 years, the city participated in four French and Indian Wars, until the British defeated the French and their Indian allies in North America. Boston was the largest town in British America until Philadelphia grew larger in the mid-18th century.
Boston's oceanfront location made it a lively port, the city engaged in shipping and fishing during its colonial days. However, Boston stagnated in the decades prior to the Revolution. By the mid-18th century, New York City and Philadelphia surpassed Boston in wealth. Boston encountered financial difficulties as other cities in New England grew rapidly. Many of the crucial events of the American Revolution occurred near Boston. Boston's penchant for mob action along with the colonists' growing distrust in Britain fostered a revolutionary spirit in the city; when the British government passed the Stamp Act in 1765, a Boston mob ravaged the homes of Andrew Oliver, the official tasked with enforcing the Act, Thomas Hutchinson the Lieutenant Governor of Massachusetts. The British sent two regiments to Boston in 1768 in an attempt to quell the angry colonists; this did not sit well with the colonists. In 1770, during the Boston Massacre, the army killed several people in response to a mob in Boston.
The colonists compelled the British to withdraw their troops. The event was publicized and fueled a revolutionary movement in America. In 1773, Britain passed the Tea Act. Many of the colonists saw the act as an attempt to force them to accept the taxes established by the Townshend Acts; the act prompted the Boston Tea Party, where a group of rebels threw an entire shipment of tea sent by the British East India Company into Boston Harbor. The Boston Tea Party was a key event leading up to the revolution, as the British government responded furiously with the Intolerable Acts, demanding compensation for the lost tea from the rebels; this led to the American Revolutionary War. The war began in the area surrounding Boston with the Battles of Concord. Boston itself was besieged for a year during the Siege of Boston, which began on April 19, 1775; the New England militia impeded the movement of the British Army. William Howe, 5th Viscount Howe the commander-in-chief of the British forces in North America, led the British army in the siege.
On June 17, the British captured the Charlestown peninsula in Boston, during the Battle of Bunker Hill. The British army outnumbered the militia stationed there, but it was a Py
Bucks County, Pennsylvania
Bucks County is a county located in the Commonwealth of Pennsylvania. As of the 2010 census, the population was 625,249, making it the fourth-most populous county in Pennsylvania and the 99th-most populous county in the United States; the county seat is Doylestown. The county is named after the English county of Buckinghamshire or more its shortname. Bucks County constitutes part of the northern boundary of the Philadelphia–Camden–Wilmington, PA–NJ–DE–MD Metropolitan Statistical Area, more known as the Delaware Valley, it is located northeast of Philadelphia and forms part of the southern tip of the eastern state border. Bucks County is one of the three original counties created by colonial proprietor William Penn in 1682. Penn named the county after Buckinghamshire, the county, he built a country estate called Pennsbury Manor in Bucks County. Some places in Bucks County were named after locations in Buckinghamshire, including Buckingham Township, named after the county town of Buckinghamshire.
Bucks County was much larger than it is today. Northampton County was formed in 1752 from part of Bucks County, Lehigh County was formed in 1812 from part of Northampton County. General George Washington and his troops camped in Bucks County as they prepared to cross the Delaware River to take Trenton, New Jersey, by surprise on the morning of December 26, 1776, their successful attack on Britain's Hessian forces was a turning point in the American War of Independence. The town of Washington Crossing and Washington Crossing Historic Park were named to commemorate the event. According to the U. S. Census Bureau, the county has a total area of 622 square miles, of which 604 square miles is land and 18 square miles is water; the southern third of the county between Philadelphia and Trenton, New Jersey called Lower Bucks, resides in the Atlantic Coastal Plain, is flat and near sea level, the county's most populated and industrialized area. Bucks County shares a western border with Montgomery County, borders Philadelphia to the southwest, Northampton and Lehigh Counties to the north.
From north to south, it is linked to Warren, Hunterdon and Burlington Counties in New Jersey by bridges. Tohickon Creek and Neshaminy Creek are the largest tributaries of the Delaware in Bucks County. Tohickon Creek empties into the river at Point Neshaminy at Croydon. Lehigh County Northampton County Warren County, New Jersey Hunterdon County, New Jersey Mercer County, New Jersey Burlington County, New Jersey Philadelphia County Montgomery County Relatively speaking, Bucks County experiences warm/hot and humid summers with chilly/cold and somewhat snowy winters. Episodes of high humidity occur every year during or close to the summer months occasionally reaching extreme levels; when high humidity combines with air temperatures in the mid-upper 90's, dangerous heat index values of >= 105 °F can sometimes result. Winter minimum air temperatures fall into the single digits to below 0 °F; when the coldest temperatures combine with higher winds, wind chill values can sometimes plummet below 0 °F to as cold as -20 °F. Spring and fall are comparatively tranquil.
The climate cools as one moves from the lower elevation, dense suburban areas in southern Bucks County, to the higher elevation, rural areas of northern Bucks. Precipitation is well-distributed throughout the year; the average seasonal snowfall, which can occur from as early as October to as late as April, is around 2 feet in extreme southern Bucks, around 3 feet in the highest elevations of far northern Bucks. The fall foliage season peaks in mid-October in northern Bucks, mid-late October in central Bucks, late-October/early-November in southern Bucks; these dates correlate with the typical date of first freeze. Peak spring foliage occurs during the month of April, which correlates with the typical date of last freeze. Bucks County has four distinct seasons and has a hot-summer humid continental climate except for some far southern lowlands including Bristol which have a humid subtropical climate; the hardiness zones are 7a. Monthly climatic averages for Quakertown, upper Bucks County, PA. Monthly climatic averages for Doylestown, central Bucks County, PA.
Monthly climatic averages for Bristol, lower Bucks County, PA. As of the 2010 census, there were 625,249 people; the population density was 1,034.7 people per square mile. The racial makeup of the county was 86.6% White non-Hispanic, 3.9% Black or African American, 0.3% Native American, 4.1% Asian 0.1% Pacific Islander, 1.7% were of two or more races, 1.5% were of other races. 4.4% of the population were Hispanic or Latino of any race. As of the census of 2000, there were 218,725 households, 160,981 families residing in the county. There were 225,498 housing units at an average density of 371 per square mile. 20.1 % were of 19.1 % Irish, 14.0 % Italian, 7.5 % English and 5.9 % Polish ancestry. There were 218,725 households, out of which 35.30% had children under the age of 18 living with them, 61.20% were married coup
Visual perception is the ability to interpret the surrounding environment using light in the visible spectrum reflected by the objects in the environment. This is different from visual acuity, which refers to how a person sees. A person can have problem with visual perceptual processing if he/she has 20/20 vision; the resulting perception is known as visual perception, sight, or vision. The various physiological components involved in vision are referred to collectively as the visual system, are the focus of much research in linguistics, cognitive science and molecular biology, collectively referred to as vision science; the visual system in animals allows individuals to assimilate information from their surroundings. The act of seeing starts when the cornea and the lens of the eye focuses light from its surroundings onto a light-sensitive membrane in the back of the eye, called the retina; the retina is part of the brain, isolated to serve as a transducer for the conversion of light into neuronal signals.
Based on feedback from the visual system, the lens of the eye adjusts its thickness to focus light on the photoreceptive cells of the retina known as the rods and cones, which detect the photons of light and respond by producing neural impulses. These signals are processed via complex feedforward and feedback processes by different parts of the brain, from the retina upstream to central ganglia in the brain. Note that up until now much of the above paragraph could apply to octopuses, worms and things more primitive. However, the following applies to mammals and birds: The retina in these more complex animals sends fibers to the lateral geniculate nucleus, to the primary and secondary visual cortex of the brain. Signals from the retina can travel directly from the retina to the superior colliculus; the perception of objects and the totality of the visual scene is accomplished by the visual association cortex. The visual association cortex combines all sensory information perceived by the striate cortex which contains thousands of modules that are part of modular neural networks.
The neurons in the striate cortex send axons to the extrastriate cortex, a region in the visual association cortex that surrounds the striate cortex. The human visual system is believed to perceive visible light in the range of wavelengths between 370 and 730 nanometers of the electromagnetic spectrum. However, some research suggests that humans can perceive light in wavelengths down to 340 nanometers the young; the major problem in visual perception is that what people see is not a translation of retinal stimuli. Thus people interested in perception have long struggled to explain what visual processing does to create what is seen. There were two major ancient Greek schools, providing a primitive explanation of how vision is carried out in the body; the first was the "emission theory" which maintained that vision occurs when rays emanate from the eyes and are intercepted by visual objects. If an object was seen directly it was by'means of rays' coming out of the eyes and again falling on the object.
A refracted image was, seen by'means of rays' as well, which came out of the eyes, traversed through the air, after refraction, fell on the visible object, sighted as the result of the movement of the rays from the eye. This theory was championed by scholars like their followers; the second school advocated the so-called'intro-mission' approach which sees vision as coming from something entering the eyes representative of the object. With its main propagators Aristotle and their followers, this theory seems to have some contact with modern theories of what vision is, but it remained only a speculation lacking any experimental foundation. Both schools of thought relied upon the principle that "like is only known by like", thus upon the notion that the eye was composed of some "internal fire" which interacted with the "external fire" of visible light and made vision possible. Plato makes this assertion in his dialogue Timaeus, in his De Sensu. Alhazen carried out many investigations and experiments on visual perception, extended the work of Ptolemy on binocular vision, commented on the anatomical works of Galen.
He was the first person to explain that vision occurs when light bounces on an object and is directed to one's eyes. Leonardo da Vinci is believed to be the first to recognize the special optical qualities of the eye, he wrote "The function of the human eye... was described by a large number of authors in a certain way. But I found it to be different." His main experimental finding was that there is only a distinct and clear vision at the line of sight—the optical line that ends at the fovea. Although he did not use these words he is the father of the modern distinction between foveal and peripheral vision. Issac Newton was the first to discover through experimentation, by isolating individual colors of the spectrum of light passing through a prism, that the visually perceived color of objects appeared due to the character
Radcliffe College was a women's liberal arts college in Cambridge and functioned as the female coordinate institution for the all-male Harvard College. It was one of the Seven Sisters colleges, among which it shared with Bryn Mawr College, Wellesley College, Smith College, others the popular reputation of having a intellectual and independent-minded female student body. Radcliffe conferred Radcliffe College diplomas to undergraduates and graduate students for the first 70 or so years of its history and joint Harvard-Radcliffe diplomas to undergraduates beginning in 1963. A formal "non-merger merger" agreement with Harvard was signed in 1977, with full integration with Harvard completed in 1999. Today, within Harvard University, Radcliffe's former administrative campus is home to the Radcliffe Institute for Advanced Study, former Radcliffe housing at the Radcliffe Quadrangle has been incorporated into the Harvard College house system. Under the terms of the 1999 consolidation, the Radcliffe Yard and the Radcliffe Quadrangle retain the "Radcliffe" designation in perpetuity.
The "Harvard Annex," a private program for the instruction of women by Harvard faculty, was founded in 1879 after prolonged efforts by women to gain access to Harvard College. Arthur Gilman, Cambridge resident, banker and writer, was the founder of what became The Annex/Radcliffe. At a time when higher education for women was a controversial topic, Gilman hoped to establish a higher educational opportunity for his daughter that exceeded what was available in female seminaries and the new women's colleges such as Vassar and Wellesley, most of which in their early years had substantial numbers of faculty who were not university trained. In conversations with the chair of Harvard's classics department, he outlined a plan to have Harvard faculty deliver instruction to a small group of Cambridge and Boston women, he approached Harvard President Charles William Eliot with the idea and Eliot approved. Gilman and Eliot recruited a group of prominent and well-connected Cambridge women to manage the plan.
These women were Elizabeth Cary Agassiz, Mary H. Cooke, Stella Scott Gilman, Mary B. Greenough, Ellen Hooper Gurney, Alice Mary Longfellow and Lillian Horsford. Building upon Gilman's premise, the committee convinced 44 members of the Harvard faculty to consider giving lectures to female students in exchange for extra income paid by the committee; the program came to be known informally as "The Harvard Annex." The course of study for the first year included 51 courses in 13 subject areas, an "impressive curriculum with greater diversity than that of any other women's college at its inception. Courses were offered in Greek, English, French and Spanish; the first graduation ceremonies took place in the library of Longfellow House on Brattle Street, just above where George Washington's generals had slept a century earlier. The committee members hoped that by raising an enticing endowment for The Annex they would be able to convince Harvard to admit women directly into Harvard College. However, the university resisted.
In his inaugural address as president of Harvard in 1869, Charles Eliot summed up the official Harvard position toward female students when he said, "The world knows next to nothing about the capacities of the female sex. Only after generations of civil freedom and social equality will it be possible to obtain the data necessary for an adequate discussion of woman's natural tendencies and capabilities... It is not the business of the University to decide this mooted point." In a similar vein, when confronted with the notion of females receiving Harvard degrees in 1883, the University's treasurer stated, "I have no prejudice in the matter of education of women and am quite willing to see Yale or Columbia take any risks they like, but I feel bound to protect Harvard College from what seems to me a risky experiment."Some of President Eliot's objections stemmed from 19th century notions of propriety. He was against co-education, commenting that "The difficulties involved in a common residence of hundreds of young men and women of immature character and marriageable age are grave.
The necessary police regulations are exceedingly burdensome." The committee persevered despite Eliot's skepticism. Indeed, the project proved attracting a growing number of students; as a result, the Annex was incorporated in 1882 as the Society for the Collegiate Instruction of Women, with Elizabeth Cary Agassiz, widow of Harvard professor Louis Agassiz, as president. This Society did not have the power to confer academic degrees. In subsequent years, on-going discussions with Harvard about admitting women directly into the university still came to a dead end, instead Harvard and the Annex negotiated the creation of a degree-granting institution, with Harvard professors serving as its faculty and visiting body; this modification of the Annex was chartered by the Commonwealth of Massachusetts as Radcliffe College in 1894, the eponym being early Harvard benefactor Lady Ann Mowlson. The Boston Globe reported "President of Harvard To Sign Parchments of the Fair Graduates"). Students seeking admission to the new women's college were required to sit for the same entrance examinations required of Harvard students.
By 1896, the Globe could headline a story: "Sweet Girls. They Graduate in Shoals at Radcliffe. Commencement Exercises at Sanders Theatre. Galleries Filled with Students. Handsome Mrs. Agassiz Made Fine Address. Pres Eliot Commends the Work of the New Inst
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
Psychology is the science of behavior and mind. Psychology includes the study of conscious and unconscious phenomena, as well as feeling and thought, it is an academic discipline of immense scope. Psychologists seek an understanding of the emergent properties of brains, all the variety of phenomena linked to those emergent properties; as a social science it aims to understand individuals and groups by establishing general principles and researching specific cases. In this field, a professional practitioner or researcher is called a psychologist and can be classified as a social, behavioral, or cognitive scientist. Psychologists attempt to understand the role of mental functions in individual and social behavior, while exploring the physiological and biological processes that underlie cognitive functions and behaviors. Psychologists explore behavior and mental processes, including perception, attention, intelligence, motivation, brain functioning, personality; this extends to interaction between people, such as interpersonal relationships, including psychological resilience, family resilience, other areas.
Psychologists of diverse orientations consider the unconscious mind. Psychologists employ empirical methods to infer causal and correlational relationships between psychosocial variables. In addition, or in opposition, to employing empirical and deductive methods, some—especially clinical and counseling psychologists—at times rely upon symbolic interpretation and other inductive techniques. Psychology has been described as a "hub science" in that medicine tends to draw psychological research via neurology and psychiatry, whereas social sciences most draws directly from sub-disciplines within psychology. While psychological knowledge is applied to the assessment and treatment of mental health problems, it is directed towards understanding and solving problems in several spheres of human activity. By many accounts psychology aims to benefit society; the majority of psychologists are involved in some kind of therapeutic role, practicing in clinical, counseling, or school settings. Many do scientific research on a wide range of topics related to mental processes and behavior, work in university psychology departments or teach in other academic settings.
Some are employed in industrial and organizational settings, or in other areas such as human development and aging, sports and the media, as well as in forensic investigation and other aspects of law. The word psychology derives from Greek roots meaning study of soul; the Latin word psychologia was first used by the Croatian humanist and Latinist Marko Marulić in his book, Psichiologia de ratione animae humanae in the late 15th century or early 16th century. The earliest known reference to the word psychology in English was by Steven Blankaart in 1694 in The Physical Dictionary which refers to "Anatomy, which treats the Body, Psychology, which treats of the Soul."In 1890, William James defined psychology as "the science of mental life, both of its phenomena and their conditions". This definition enjoyed widespread currency for decades. However, this meaning was contested, notably by radical behaviorists such as John B. Watson, who in his 1913 manifesto defined the discipline of psychology as the acquisition of information useful to the control of behavior.
Since James defined it, the term more connotes techniques of scientific experimentation. Folk psychology refers to the understanding of ordinary people, as contrasted with that of psychology professionals; the ancient civilizations of Egypt, China and Persia all engaged in the philosophical study of psychology. In Ancient Egypt the Ebers Papyrus mentioned thought disorders. Historians note that Greek philosophers, including Thales and Aristotle, addressed the workings of the mind; as early as the 4th century BC, Greek physician Hippocrates theorized that mental disorders had physical rather than supernatural causes. In China, psychological understanding grew from the philosophical works of Laozi and Confucius, from the doctrines of Buddhism; this body of knowledge involves insights drawn from introspection and observation, as well as techniques for focused thinking and acting. It frames the universe as a division of, interaction between, physical reality and mental reality, with an emphasis on purifying the mind in order to increase virtue and power.
An ancient text known as The Yellow Emperor's Classic of Internal Medicine identifies the brain as the nexus of wisdom and sensation, includes theories of personality based on yin–yang balance, analyzes mental disorder in terms of physiological and social disequilibria. Chinese scholarship focused on the brain advanced in the Qing Dynasty with the work of Western-educated Fang Yizhi, Liu Zhi, Wang Qingren. Wang Qingren emphasized the importance of the brain as the center of the nervous system, linked mental disorder with brain diseases, investigated the causes of dreams and insomnia, advanced a theory of hemispheric lateralization in brain function. Distinctions in types of awareness appear in the ancient thought of India, influenced by Hinduism. A central idea of the Upanishads is the distinction between a person's transient mundane self and their eternal unchanging soul. Divergent Hindu doctrines, Buddhism, have challenged this hierarchy of selves, but have all emphasized the importance of reaching higher