Timeline of psychology

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This article is a general timeline of psychology. A more general description of the development of the subject of psychology can be found in the History of psychology article. Related information can be found in the Timeline of psychiatry article. A more specific review of important events in the development of psychotherapy can be found in the Timeline of psychotherapy article.

Ancient history — CE

First century

  • ca. 50 - Aulus Cornelius Celsus died, leaving De Medicina, a medical encyclopedia; Book 3 covers mental diseases. The term insania, insanity, was first used by him. The methods of treatment included bleeding, frightening the patient, emetics, enemas, total darkness, and decoctions of poppy or henbane, and pleasant ones such as music therapy, travel, sport, reading aloud, and massage. He was aware of the importance of the doctor-patient relationship.[6]
  • ca. 100 - Rufus of Ephesus believed that the nervous system was instrumental in voluntary movement and sensation. He discovered the optic chiasma by anatomical studies of the brain. He stressed taking a history of both physical and mental disorders. He gave a detailed account of melancholia, and was quoted by Galen.[3]
  • 93-138 - Soranus of Ephesus advised kind treatment in healthy and comfortable conditions, including light, warm rooms.[3]

Second century

  • ca. 130-200 - Galen "was schooled in all the psychological systems of the day: Platonic, Aristotelian, Stoic, and Epicurean"[4]
  • ca. 150-200 - Aretaeus of Cappadocia[4]

Third century

  • 155-220 Tertullian[2]
  • 205-270 Plotinus wrote Enneads a systematic account of Neoplatonist philosophy, also nature of visual perception and how memory might work.[5]

Fourth century

Fifth century

  • 5th century - Caelius Aurelianus opposed harsh methods of handling the insane, and advocated humane treatment.[3]
  • ca. 423-529 - Theodosius the Cenobiarch founded a monastery at Kathismus, near Bethlehem. Three hospitals were built by the side of the monastery: one for the sick, one for the aged, and one for the insane.[3]
  • ca. 451 - Patriarch Nestorius of Constantinople: his followers dedicated themselves to the sick and became physicians of great repute. They brought the works of Hippocrates, Aristotle, and Galen, and influenced the approach to physical and mental disorders in Persia and Arabia[3]

Seventh century

  • 625-690 - Paul of Aegina suggested that hysteria should be treated by ligature of the limbs, and mania by tying the patient to a mattress placed inside a wicker basket and suspended from the ceiling. He also recommended baths, wine, special diets, and sedatives for the mentally ill. He described the following mental disorders: phrenitis, delirium, lethargus, melancholia, mania, incubus, lycanthropy, and epilepsy

Eighth century

Ninth century

Tenth century

  • ca. 900 – The concept of mental health (mental hygiene) was introduced by Ahmed ibn Sahl al-Balkhi. He also recognized that illnesses can have both psychological and/or physiological causes.[9]
  • ca. 900 – al-Razi (Rhazes) recognized the concept of "psychotherapy" and referred to it as al-‘ilaj al-nafs.[10]

Eleventh century

Twelfth century

Thirteenth century

  • c. 1180 – 1245 Alexander of Hales
  • c. 1190 – 1249 William of Auvergne
  • 1215–1277 Peter Juliani taught in the medical faculty of the University of Siena, and wrote on medical, philosophical and psychological topics. He personal physician to Pope Gregory X and later became archbishop and cardinal. He was elected pope under the name John XXI in 1276.[5][13]
  • c. 1214 – 1294 Roger Bacon
  • 1221–1274 Bonaventure
  • 1193–1280 Albertus Magnus
  • 1225 – Thomas Aquinas
  • 1240 – Bartholomeus Anglicus published De Proprietatibus Rerum, which included a dissertation on the brain, recognizing that mental disorders can have a physical or psychological cause.
  • 1247 – Bethlehem Royal Hospital in Bishopsgate outside the wall of London, one of the most famous old psychiatric hospitals was founded as a priory of the Order of St. Mary of Bethlem to collect alms for Crusaders; after the English government secularized it, it started admitting mental patients by 1377 (c. 1403), becoming known as Bedlam Hospital; in 1547 it was acquired by the City of London, operating until 1948; it is now part of the British NHS Foundation Trust.[14]
  • 1266–1308 Duns Scotus
  • ca. 1270 - Witelo wrote Perspectiva, a work on optics containing speculations on psychology, nearly discovering the subconscious.
  • 1295 Lanfranc writes Science of Cirurgie[5]

Fourteenth century

  • 1347-50 - The Black Death devastated Europe.
  • ca. 1375 - English authorities regarded mental illness as demonic possession, treating it with exorcism and torture.[15]

Fifteenth century

  • ca. 1400 - Renaissance Humanism caused a reawakening of ancient knowledge of science and medicine.
  • 1433–1499 Marsilio Ficino was a renowned figure of the Italian Renaissance, a Neoplatonist humanist, a translator of Greek philosophical writing, and the most influential exponent of Platonism in Italy in the fifteenth century.[4]
  • ca. 1450 - The pendulum in Europe swings, bringing witch mania, causing thousands of women to be executed for witchcraft until the late 17th century.

Sixteenth century

  • 1590 – Scholastic philosopher Rudolph Goclenius coined the term "psychology"; though usually regarded as the origin of the term, there is evidence that it was used at least six decades earlier by Marko Marulić.

Seventeenth century

Eighteenth century

Nineteenth century


  • ca. 1800 - Franz Joseph Gall developed cranioscopy, the measurement of the skull to determine psychological characteristics, which was later renamed phrenology; it is now discredited.
  • 1807 - Georg Wilhelm Friedrich Hegel published Phenomenology of Spirit (Mind), which describes his thesis-antithesis-synthesis dialectical method, according to which knowledge pushes forwards to greater certainty, and ultimately towards knowledge of the noumenal world.
  • 1808 - Johann Christian Reil coined thetry".









Twentieth century











Twenty-first century



  • 2010 - The draft of DSM-5 by the American Psychiatric Association (APA) was distributed for comment and critique.
  • 2010 - Simon LeVay published Gay, Straight, and the Reason Why, which in 2012 received the Bullough Book Award for the most distinguished book written for the professional sexological community published in a given year.[79]
  • 2012 - In 2009 America's professional association of endocrinologists established best practices for transgender children that included prescribing puberty-suppressing drugs to preteens followed by hormone therapy beginning at about age 16, and in 2012 the American Academy of Child and Adolescent Psychiatry echoed these recommendations.[80]
  • 2012 - The American Psychiatric Association issued official position statements supporting the care and civil rights of transgender and gender non-conforming individuals.[81]
  • 2013 - On April 2 U.S. President Barack Obama announced the 10-year BRAIN Initiative to map the activity of every neuron in the human brain.
  • 2013 - DSM-5 was published by the American Psychiatric Association (APA). Among other things, it eliminated the term "gender identity disorder," which was considered stigmatizing, instead referring to "gender dysphoria," which focuses attention only on those who feel distressed by their gender identity.[82]
  • 2015 - The journal Psychology Today announced that it will no longer accept ads for gay conversion therapy, and is deleting medical practitioners who list such therapy in their professional profiles.[83]°
  • August 7, 2015 - The American Psychological Association barred psychologists from participating in national security interrogations at sites violating international law.[84]
  • August 27, 2015 - A team led by Brian Nosek of the University of Virginia published an article in Science that revealed that only 39 of 100 studies published in major psychology journals could be replicated.[85]


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