In classical conditioning, an unconditioned stimulus (US or UCS) is any stimulus that can evoke a response without the organism going through any previous learning; the response to the US (the unconditioned response) occurs naturally. For example, if you smell a lemon, it might get a sour taste in your mouth and you may salivate. This may occur from the time you are born and can occur without you ever having tasted a lemon before. The lemon, therefore, is a US since it produced the salivation and sour taste (the UR) naturally, without you having any previous experience with lemons.
Cite this article
mohammad looti (2025). Unconditional Stimulus. PSYCHOLOGICAL SCALES. Retrieved from https://scales.arabpsychology.com/trm/unconditional-stimulus/
mohammad looti. "Unconditional Stimulus." PSYCHOLOGICAL SCALES, 8 Oct. 2025, https://scales.arabpsychology.com/trm/unconditional-stimulus/.
mohammad looti. "Unconditional Stimulus." PSYCHOLOGICAL SCALES, 2025. https://scales.arabpsychology.com/trm/unconditional-stimulus/.
mohammad looti (2025) 'Unconditional Stimulus', PSYCHOLOGICAL SCALES. Available at: https://scales.arabpsychology.com/trm/unconditional-stimulus/.
[1] mohammad looti, "Unconditional Stimulus," PSYCHOLOGICAL SCALES, vol. X, no. Y, ص Z-Z, October, 2025.
mohammad looti. Unconditional Stimulus. PSYCHOLOGICAL SCALES. 2025;vol(issue):pages.