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Tabula rasa, meaning blank slate in Latin, is the epistemological theory that individuals are born without built-in mental content and that their knowledge comes from experience and perception. Generally proponents of the tabula rasa thesis favour the "nurture" side of the nature versus nurture debate, when it comes to aspects of one's personality, social and emotional behaviour, and intelligence. The term in Latin equates to the English "blank slate" (or more accurately, "scraped tablet") (which refers to writing on a slate sheet in chalk) but comes from the Roman tabula or wax tablet, used for notes, which was blanked by heating the wax and then smoothing it to give a tabula rasa.
In Western philosophy, traces of the idea that came to be called the tabula rasa appear as early as the writings of Aristotle. Aristotle writes of the unscribed tablet in what is probably the first textbook of psychology in the Western canon, his treatise "Περί Ψυχῆς" (De Anima or On the Soul, Book III, chapter 4). However, besides some arguments by the Stoics and Peripatetics, the notion of the mind as a blank slate went largely unnoticed for more than 1,000 years.
In the 11th century, the theory of tabula rasa was developed more clearly by the Persian philosopher, Ibn Sina (known as "Avicenna" in the Western world). He argued that the "human intellect at birth is rather like a tabula rasa, a pure potentiality that is actualized through education and comes to know" and that knowledge is attained through "empirical familiarity with objects in this world from which one abstracts universal concepts" which is developed through a "syllogistic method of reasoning; observations lead to prepositional statements, which when compounded lead to further abstract concepts." He further argued that the intellect itself "possesses levels of development from the material intellect (al-‘aql al-hayulani), that potentiality can acquire knowledge to the active intellect (al-‘aql al-fa‘il), the state of the human intellect at conjunction with the perfect source of knowledge".
In the 12th century, the Andalusian-Islamic philosopher and novelist Ibn Tufail (known as "Abubacer" or "Ebn Tophail" in the West) demonstrated the theory of tabula rasa as a thought experiment through his Arabic philosophical novel, Hayy ibn Yaqzan, in which he depicted the development of the mind of a feral child "from a tabula rasa to that of an adult, in complete isolation from society" on a desert island, through experience alone. The Latin translation of his philosophical novel, entitled Philosophus Autodidactus, published by Edward Pococke the Younger in 1671, had an influence on John Locke's formulation of tabula rasa in An Essay Concerning Human Understanding.
In the 13th century, St. Thomas Aquinas brought the Aristotelian and Avicennian notions to the forefront of Christian thought. These notions sharply contrasted with the previously held Platonic notions of the human mind as an entity that preexisted somewhere in the heavens, before being sent down to join a body here on Earth (see Plato's Phaedo and Apology, as well as others). St. Bonaventure (also 13th century) was one of Aquinas' fiercest intellectual opponents, offering some of the strongest arguments towards the Platonic idea of the mind.
The writings of Avicenna, Ibn Tufail and Aquinas on the tabula rasa theory stood unprogressed and untested for several centuries. In fact, our modern idea of the theory is mostly attributed to John Locke's expression of the idea in An Essay Concerning Human Understanding in the 17th century. In Locke's philosophy, tabula rasa was the theory that the (human) mind is at birth a "blank slate" without rules for processing data, and that data is added and rules for processing are formed solely by one's sensory experiences. The notion is central to Lockean empiricism. As understood by Locke, tabula rasa meant that the mind of the individual was born "blank", and it also emphasized the individual's freedom to author his or her own soul. Each individual was free to define the content of his or her character - but his or her basic identity as a member of the human species cannot be so altered. It is from this presumption of a free, self-authored mind combined with an immutable human nature that the Lockean doctrine of "natural" rights derives. Locke's idea of tabula rasa is frequently compared with Thomas Hobbes's viewpoint of human nature, in which humans are endowed with inherent mental content – particular with selfishness.
Tabula rasa is also featured in Sigmund Freud's psychoanalysis. Freud depicted personality traits as being formed by family dynamics (see Oedipus complex, etc.). Freud's theories imply that humans lack free will, but also that genetic influences on human personality are minimal. In psychoanalysis, one is largely determined by one's upbringing.
Tabula rasa is used by 18th century philosopher Jean-Jacques Rousseau in order to support his argument that warfare is an advent of society and agriculture, rather than something that occurs from the human state of nature. Since tabula rasa states that humans are born with a "blank-slate" Rousseau uses this to suggest that humans must learn warfare.
The tabula rasa concept became popular in social sciences in the 20th century. Early ideas of eugenics posited that human intelligence correlated strongly with social class, but these ideas were rejected, and the idea that genes (or simply "blood") determined a person's character became regarded as racist. By the 1970s, scientists such as John Money had come to see gender identity as socially constructed rather than rooted in genetics.
Computer science 
In computer science, tabula rasa refers to the development of autonomous agents which are provided with a mechanism to reason and plan toward their goal, but no "built-in" knowledge-base of their environment. They are thus truly a "blank slate".
In reality autonomous agents are provided with an initial data-set or knowledge-base, but this should not be immutable or it will hamper autonomy and heuristic ability. Even if the data-set is empty, it can usually be argued that there is an in-built bias in the reasoning and planning mechanisms. Either intentionally or unintentionally placed there by the human designer, it thus negates the true spirit of tabula rasa.
Psychology and neurobiology 
As in Philosophy, there has been an enduring claim by a minority in the fields of psychology and neurobiology that the brain is tabula rasa, at least with respect to its behavioural repertoire. Thus several psychologists such as Howe have argued against the existence of innate talent, while in neuroscience there have been debates that the brain functions with Mass action, rather than by a series of interacting mechanisms – for instance by Karl Lashley and others.
Other psychologists and neurobiologists recognize that the entire cerebral cortex is indeed preprogrammed and organized in order to process sensory input, motor control, emotions, and natural responses. These programmed mechanisms in the brain then act to learn and refine the ability of the organism. For example, psychologist Steven Pinker argues that while the brain is "programmed" to pick up spoken language easily, it is not programmed to learn to read and write, and a human generally will not spontaneously learn to do so.
Important evidence against the tabula rasa model of the mind comes from Behavioural genetics, especially twin and adoption studies. These indicate strong genetic influences on personal characteristics such as IQ, alcoholism, gender identity, and other traits. Critically, multivariate studies show that the distinct faculties of the mind such as memory and reason fractionate along genetic boundaries. Cultural universals such as emotion and the relative resilience of psychological adaptation to accidental biological changes (for instance the David Reimer case of gender reassignment following an accident) also support basic biological mechanisms in the mind.
- Sajjad H. Rizvi (2006), Avicenna/Ibn Sina (CA. 980–1037), Internet Encyclopedia of Philosophy
- G. A. Russell (1994), The Impact of the Philosophus autodidactus: Pocockes, John Locke and the Society of Friends, in: G. A. Russell (ed.), The 'Arabick' Interest of the Natural Philosophers in Seventeenth-Century England, pp. 224–262, Brill Publishers, ISBN 90-04-09459-8.
- The Jargon Files: "Sussman attains enlightenment", also see the article section Hacker koan: Uncarved block
- M. J. Howe, J. W. Davidson and J. A. Sloboda. (1998). Innate talents: reality or myth? Behav Brain Sci, 21, 399-407; discussion 407-42.
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- Pinker, Steven. The Blank Slate. New York: Penguin. 2002.
- Aristotle, On the Soul (De Anima), W. S. Hett (trans.), pp. 1–203 in Aristotle, Volume 8, Loeb Classical Library, William Heinemann, London, UK, 1936.
- Avicenna, De Anima (Fi’l-Nafs), F. Rahman (trans.), London, UK, 1954.
- Tufail, Ibn, The Improvement of Human Reason: Exhibited in the Life of Hai Ebn Yokdhan (Hayy ibn Yaqzan), Simon Ockley (trans.), pp. 1–195, Edm. Powell, London, UK, 1708.
- Aquinas, Thomas, Summa Theologica, Fathers of the English Dominican Province (trans.), Daniel J. Sullivan (ed.), vols. 19–20 in Robert Maynard Hutchins (ed.), Great Books of the Western World, Encyclopædia Britannica, Inc., Chicago, IL, 1952.
- Locke, John, An Essay Concerning Human Understanding, Kenneth P. Winkler (ed.), pp. 33–36, Hackett Publishing Company, Indianapolis, IN, 1996.
- Baird, Forrest E.; Walter Kaufmann (2008). From Plato to Derrida. Upper Saddle River, New Jersey: Pearson Prentice Hall. ISBN 0-13-158591-6.