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imperceptible

imperceptible In historical psychology, imperceptible refers to a stimulus or a difference between stimuli that is too weak to be consciously noticed.

In historical psychology, imperceptible refers to a stimulus or a difference between stimuli that is too weak to be consciously noticed. It describes stimulation lying below the conscious threshold, in contrast to what is just barely noticeable above it.

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Imperceptible” (Imperceptible).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “imperceptible.” Development preview.

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imperceptible

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Sources

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