# Johannes von Kries

> Johannes Adolf von Kries was a German physiological psychologist who formulated the modern “duplicity” or “duplexity” theory of vision mediated by rod cells at low light levels and three types of cone cells at higher light levels. He made important contributions in the field of haemodynamics. In addition, von Kries was a significant theorist of the foundations of probability.

*German physiological psychologist (1853–1928)*

**Canonical URL:** https://fame.am/person/johannes-von-kries

## Identity
- **Profile type:** Doctor ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Doctors
- **Country:** Germany
- **Born:** 1853-10-06
- **Died:** 1928-12-30
- **Status:** deceased
- **Gender:** male

## Bio

Imported from discovery source: wikidata-dump

## Fame
- **Popularity score:** 38.9 / 100
- **Momentum:** 0.1 / 100  (trend: FALLING)
- **Historical depth:** 6.5 / 100
- **Now attention:** 0.0 / 100
- **Source confidence:** 40.0 / 100
- **Profile completeness:** 55.0 / 100

## Sources
- [Johannes von Kries](https://sv.wikipedia.org/wiki/Johannes_von_Kries)
- [جون كريس](https://arz.wikipedia.org/wiki/%D8%AC%D9%88%D9%86_%D9%83%D8%B1%D9%8A%D8%B3)
- [Johannes von Kries](https://de.wikipedia.org/wiki/Johannes_von_Kries)
- [Johannes von Kries](https://en.wikipedia.org/wiki/Johannes_von_Kries)
- [ヨハネス・フォン・クリース](https://ja.wikipedia.org/wiki/%E3%83%A8%E3%83%8F%E3%83%8D%E3%82%B9%E3%83%BB%E3%83%95%E3%82%A9%E3%83%B3%E3%83%BB%E3%82%AF%E3%83%AA%E3%83%BC%E3%82%B9)
- [Johannes von Kries](https://pl.wikipedia.org/wiki/Johannes_von_Kries)
- [Крис, Иоганн](https://ru.wikipedia.org/wiki/%D0%9A%D1%80%D0%B8%D1%81%2C_%D0%98%D0%BE%D0%B3%D0%B0%D0%BD%D0%BD)
- [Wikidata](https://www.wikidata.org/wiki/Q85929)

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