Unconscious inference (German:
unbewusster Schluss), also referred to as
unconscious conclusion, is a term of
perceptual psychology coined in 1867 by the German
physicist and
polymath Hermann von Helmholtz to describe an involuntary, pre-rational and reflex-like mechanism which is part of the formation of visual impressions. While precursory notions have been identified in the writings of
Thomas Hobbes,
Robert Hooke, and
Francis North (especially in connection with
auditory perception) as well as in
Francis Bacon's
Novum Organum, Helmholtz's theory was long ignored or even dismissed by philosophy and psychology. It has since received new attention from modern research, and the work of recent scholars, notably that of James Uleman, has approached Helmholtz's view.