Ignaz Paul Vital Troxler (17 August 1780 – 6 March 1866) was a

Swiss Swiss most commonly refers to: * the adjectival form of Switzerland * Swiss people Swiss may also refer to: Places * Swiss, Missouri * Swiss, North Carolina * Swiss, West Virginia * Swiss, Wisconsin Other uses * Swiss Café, an old café located ...

physician A physician, medical practitioner (British English), medical doctor, or simply doctor is a health professional who practices medicine, which is concerned with promoting, maintaining or restoring health through the Medical education, study, Med ...

politician A politician is a person who participates in Public policy, policy-making processes, usually holding an elective position in government. Politicians represent the people, make decisions, and influence the formulation of public policy. The roles ...

, and

philosopher Philosophy ('love of wisdom' in Ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, Value (ethics and social sciences), value, mind, and language. It is a rational an ...

Early life, education, and career

Troxler was born in August 1780 in

Beromünster Beromünster is a municipality in the district of Sursee in the canton of Lucerne in Switzerland. On 1 January 2004 the former municipality of Schwarzenbach merged into the municipality of Beromünster.Switzerland Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...

. He studied in

Jena Jena (; ) is a List of cities and towns in Germany, city in Germany and the second largest city in Thuringia. Together with the nearby cities of Erfurt and Weimar, it forms the central metropolitan area of Thuringia with approximately 500,000 in ...

and

Göttingen Göttingen (, ; ; ) is a college town, university city in Lower Saxony, central Germany, the Capital (political), capital of Göttingen (district), the eponymous district. The River Leine runs through it. According to the 2022 German census, t ...

. Among his teachers were

Georg Wilhelm Friedrich Hegel Georg Wilhelm Friedrich Hegel (27 August 1770 – 14 November 1831) was a 19th-century German idealist. His influence extends across a wide range of topics from metaphysical issues in epistemology and ontology, to political philosophy and t ...

and

Friedrich Wilhelm Joseph von Schelling Friedrich Wilhelm Joseph Schelling (; 27 January 1775 – 20 August 1854), later (after 1812) von Schelling, was a German philosopher. Standard histories of philosophy make him the midpoint in the development of German idealism, situating him be ...

. After earning his degree, he worked as a physician in

Vienna Vienna ( ; ; ) is the capital city, capital, List of largest cities in Austria, most populous city, and one of Federal states of Austria, nine federal states of Austria. It is Austria's primate city, with just over two million inhabitants. ...

, where he befriended

Ludwig van Beethoven Ludwig van Beethoven (baptised 17 December 177026 March 1827) was a German composer and pianist. He is one of the most revered figures in the history of Western music; his works rank among the most performed of the classical music repertoire ...

and married Wilhelmine Polborn. During that time, Troxler discovered a phenomenon of

visual perception Visual perception is the ability to detect light and use it to form an image of the surrounding Biophysical environment, environment. Photodetection without image formation is classified as ''light sensing''. In most vertebrates, visual percept ...

which is remarkably often confused with color-fading color-adaptation, that now bears his name,

Troxler's fading Troxler's fading, also called Troxler fading or the Troxler effect, is an optical illusion affecting visual perception. When one fixates on a particular point for even a short period of time, an unchanging stimulus away from the fixation point w ...

Teaching and later life

In 1811, he returned to Beromünster. Troxler represented Switzerland at the

Congress of Vienna The Congress of Vienna of 1814–1815 was a series of international diplomatic meetings to discuss and agree upon a possible new layout of the European political and constitutional order after the downfall of the French Emperor Napoleon, Napol ...

in 1815. In 1820 he became a professor for philosophy and history at the

lyceum The lyceum is a category of educational institution defined within the education system of many countries, mainly in Europe. The definition varies among countries; usually it is a type of secondary school. Basic science and some introduction to ...

Lucerne Lucerne ( ) or Luzern ()Other languages: ; ; ; . is a city in central Switzerland, in the Languages of Switzerland, German-speaking portion of the country. Lucerne is the capital of the canton of Lucerne and part of the Lucerne (district), di ...

but had to leave after a year due to political problems. He founded an educational institution in

Aarau Aarau (, ) is a List of towns in Switzerland, town, a Municipalities of Switzerland, municipality, and the capital of the northern Swiss Cantons of Switzerland, canton of Aargau. The List of towns in Switzerland, town is also the capital of the d ...

and continued working as a physician. In 1830, he returned to teaching, this time in

Basel Basel ( ; ), also known as Basle ( ), ; ; ; . is a city in northwestern Switzerland on the river Rhine (at the transition from the High Rhine, High to the Upper Rhine). Basel is Switzerland's List of cities in Switzerland, third-most-populo ...

; but had to leave once again the next year due to political problems. In 1832 he was elected to the legislative assembly of the

canton Canton may refer to: Administrative divisions * Canton (administrative division), territorial/administrative division in some countries * Township (Canada), known as ''canton'' in Canadian French Arts and entertainment * Canton (band), an It ...

Aargau Aargau ( ; ), more formally the Canton of Aargau (; ; ; ), is one of the Canton of Switzerland, 26 cantons forming the Switzerland, Swiss Confederation. It is composed of eleven districts and its capital is Aarau. Aargau is one of the most nort ...

. He became a professor at the newly established

University of Berne The University of Bern (, , ) is a public research university in the Swiss capital of Bern. It was founded in 1834. It is regulated and financed by the canton of Bern. It is a comprehensive university offering a broad choice of courses and progra ...

in 1834, where he stayed until 1850. In 1848, Troxler succeeded in altering the

Swiss Federal Constitution The Federal Constitution of the Swiss Confederation (SR 10; (BV); (Cst.); (Cost.); ) of 18 April 1999 (SR 101) is the third and current federal constitution of Switzerland. It establishes the Swiss Confederation as a federal republic of ...

to include elements of the

United States Constitution The Constitution of the United States is the Supremacy Clause, supreme law of the United States, United States of America. It superseded the Articles of Confederation, the nation's first constitution, on March 4, 1789. Originally includi ...

Death

Troxler died on 6 March 1866 in Aarau, Switzerland, and is buried there.

References

{{DEFAULTSORT:Troxler, Ignaz Paul Vital 1780 births 1866 deaths Swiss psychologists 19th-century Swiss physicians Swiss philosophers People from Aarau