STIMULI
STIMULUS
stimulation, stimulus, stimulant, input
(noun) any stimulating information or event; acts to arouse action
Source: WordNet® 3.1
Noun
stimuli
plural of stimulus
Source: Wiktionary
STIMULUS
Stim"u*lus, n.; pl. Stimuli. Etym: [L., for stigmulus, akin to L.
instigare to stimulate. See Instigare, Stick, v. t.]
1. A goad; hence, something that rouses the mind or spirits; an
incentive; as, the hope of gain is a powerful stimulus to labor and
action.
2. That which excites or produces a temporary increase of vital
action, either in the whole organism or in any of its parts;
especially (Physiol.), any substance or agent capable of evoking the
activity of a nerve or irritable muscle, or capable of producing an
impression upon a sensory organ or more particularly upon its
specific end organ.
Note: Of the stimuli applied to the sensory apparatus, physiologists
distinguish two kinds: (a) Homologous stimuli, which act only upon
the end organ, and for whose action the sense organs are especially
adapted, as the rods and cones of the retina for the vibrations of
the either. (b) Heterologous stimuli, which are mechanical, chemical,
electrical, etc., and act upon the nervous elements of the sensory
apparatus along their entire course, producing, for example, the
flash of light beheld when the eye is struck. Landois & Stirling.
Source: Webster’s Unabridged Dictionary 1913 Edition