# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/johannes-von-kries
# Generated: 2026-08-15T00:12:04.796Z

schema: https://schema.org/Person
url: "https://fame.am/person/johannes-von-kries"
name: "Johannes von Kries"
slug: "johannes-von-kries"
description: "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."
tagline: "German physiological psychologist (1853–1928)"
gender: "male"
country:
  name: "Germany"
  isoCode: "DE"
category:
  name: "Doctors"
  slug: "doctors"
profileType:
  name: "Doctor"
  slug: "doctor"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1853-10-06"
deathDate: "1928-12-30"
livingStatus: "DECEASED"
scores:
  popularity:           38.91
  momentum:             0.05494505494505495
  historical:           6.539921333333334
  currentAttention:     0
  sourceConfidence:     39.99999999999999
  profileCompleteness:  55
  trendDirection:       "FALLING"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://sv.wikipedia.org/wiki/Johannes_von_Kries"
    title: "Johannes von Kries"
    type:  "WIKIPEDIA"
  - url: "https://arz.wikipedia.org/wiki/%D8%AC%D9%88%D9%86_%D9%83%D8%B1%D9%8A%D8%B3"
    title: "جون كريس"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Johannes_von_Kries"
    title: "Johannes von Kries"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Johannes_von_Kries"
    title: "Johannes von Kries"
    type:  "WIKIPEDIA"
  - url: "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"
    title: "ヨハネス・フォン・クリース"
    type:  "WIKIPEDIA"
  - url: "https://pl.wikipedia.org/wiki/Johannes_von_Kries"
    title: "Johannes von Kries"
    type:  "WIKIPEDIA"
  - url: "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"
    title: "Крис, Иоганн"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q85929"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump