Tabula rasa ( ) refers to the epistemological thesis that individuals are born without built-in mental content and that their knowledge comes from experience and sensory perception.

Generally proponents of the tabula rasa thesis favor the "nurture" side of the nature versus nurture debate, when it comes to aspects of one's personality, social and emotional behavior and intelligence.

History

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 Περι Ψυχης (De Anima or On the Soul). However, besides some arguments by the Stoics and Peripatetics, the notion of the mind as a blank slate went much unnoticed for more than 1,000 years.

Then in the 11th century, the theory of tabula rasa was developed more clearly by the Early Islamic 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 that 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.G. A. Russell (1994), The 'Arabick' Interest of the Natural Philosophers in Seventeenth-Century England, pp. 224-262, Brill Publishers, ISBN 9004094598.

In the 13th century, St. Thomas Aquinas brought the Aristotelian 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 pre-existed 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.