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Stimulus

Trigger

A stimulus is any input — external or internal — that prompts a human response. It is the starting point of experience: the raw event before it has been given any meaning.

In plain language

Something happens. That's the stimulus. It hasn't meant anything yet — it's just the thing that occurred.

Duration

Instantaneous — a single moment or event

Origin

The world around you, your body, or your own thoughts

Purpose

To provide the raw material of experience. Without a stimulus there is nothing to interpret, and therefore nothing to feel.

Characteristics

Neutral until interpreted

Can be external (a sound, a comment) or internal (a memory, a pain)

Precedes every emotion

Objective — it is what actually happened

Examples

A friend does not reply to your messageRain begins to fallA stranger frowns at youA memory surfaces unexpectedly

Real-life situations

A late reply

Your message is left on read for six hours. That is the stimulus. Whether it means rejection or a busy day is not part of the stimulus itself.

A raised voice

Someone speaks to you loudly. The raised voice is the stimulus — the interpretation of anger, urgency, or excitement comes next.

Common confusion

Everyday language

“That made me angry.”

More precisely

“That was the stimulus; my interpretation produced the anger.”

A stimulus cannot directly create an emotion. It must first pass through interpretation. The same stimulus can produce very different emotions in different people.