A sub-perceptual psychedelic experience is the level at which the subjective effects produced by a psychedelic are not yet directly perceptible, meaning that they only exert a very slight change to a person's behaviour and senses. Dosages which exert effects of this intensity are often referred to as a "microdose".
Sub-perceptual dosages of psychedelics typically induce a small range of extremely faint cognitive effects which may be beneficial for enhancing a person's motivation, focus, and creativity. However, these changes may be difficult to distinguish between that of genuine alterations and the placebo effect.
The specific sub-perceptual effects which generally occur at this level of intensity are described and documented within their own dedicated articles, each of which are listed below.