external stimuli

Sensory input sources

External stimuli are signals or changes originating outside an organism that provoke a response.

Light, sound, temperature, touch, and smell are common examples.

The term appears frequently in biology and psychology to distinguish environmental inputs from internal states like hunger or emotion: The experiment measured how subjects responded to external stimuli.

Singular: external stimulus.

sensory

sight

Visual perception faculty

  • soundAudible wave phenomenon
  • smellOlfactory perception
  • tasteFlavor perception ability

touch · light · noise · aroma · texture · vibration · temperature · pressure · pain · brightness

reaction

response

Answer to stimulus

  • reflexInvoluntary stimulus response
  • startleFrighten suddenly
  • flinchInvoluntary retreat from threat

recoil · fight-or-flight · arousal · alarm · orienting · habituation · sensitization · adaptation · conditioning · instinct

interaction

engagement

Commitment to wed or attend

influence · impact · provocation · elicitation · activation · arousal · prompting · inducement · evocation · bombardment

environment

surroundings

Area around something

conditions · atmosphere · milieu · climate · noise pollution · sensory overload · urban · nature · artificial · digital

perception

detect

Notice or discover

recognize · discern · notice · register · process · interpret · filter · attend · focus · awareness

Opposites
source/origin

external stimuliinner experience

Subjective mental life

mental imagery · inner dialogue · imagination · memory · mental states

environmental relationship

external stimuligut feelings

Intuitive sense without reasoning

hunger · thirst · pain · fatigue · mood

observability

external stimuliqualia

Subjective character of experiences

Family

external, exterior, extrinsic, externalize, stimuli, externalized, externalization, externality, externalizes

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