any stimulus evoking an unlearnt response, esp in the context of classical conditioning, in which the conditioned stimulus is followed by the unconditioned one
Examples of 'unconditioned stimulus' in a sentence
unconditioned stimulus
The unconditioned stimulus was an alternating current.
Nicolas Rouleau, Lukasz M. Karbowski, Michael A. Persinger 2016, 'Experimental Evidence of Classical Conditioning and Microscopic Engrams in an ElectroconductiveMaterial', PLOS ONE10.1371/journal.pone.0165269. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Furthermore, hemodynamic responses to the unconditioned stimulus predicted behavioral discrimination performance the following day.
João Lima, Trevor Sharp, David M. Bannerman, Stephen B. McHugh 2019, 'Enhanced discriminative aversive learning and amygdala responsivity in 5-HT transportermutant mice', Translational Psychiatryhttp://link.springer.com/article/10.1038/s41398-019-0476-8. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Mild footshocks served as the unconditioned stimulus in all conditioning phases.
Margaret Grace McCue, Margaret Grace McCue, Joseph E. LeDoux, Joseph E. LeDoux, ChristopherK. Cain, Christopher K. Cain 2014, 'Medial amygdala lesions selectively block aversive Pavlovian-instrumental transferin rats.', Frontiers in Behavioral Neurosciencehttp://journal.frontiersin.org/Journal/10.3389/fnbeh.2014.00329/full. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The unconditioned stimulus was an air blast (5 bar, 10 ms).
Youssef eShiban, Jasmin eWittmann, Mara eWeißinger, Andreas eMühlberger 2015, 'Gradual extinction reduces Reinstatement', Frontiers in Behavioral Neurosciencehttp://journal.frontiersin.org/Journal/10.3389/fnbeh.2015.00254/full. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Thus, our findings indicate unconditioned stimulus revaluation effectively promoted the extinction of conditioned fear within the memory reconsolidation window.
Xiang-Xing Zeng, Juan Du, Chu-Qun Zhuang, Jun-Hua Zhang, Yan-Lei Jia, Xi-Fu Zheng 2014, 'Unconditioned Stimulus Revaluation to Promote Conditioned Fear Extinction in the MemoryReconsolidation Window', PLoS ONE10.1371/journal.pone.0101589. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Stimulation was provided on the lower back with close proximity between the conditioned stimulus and the unconditioned stimulus.
Juliane Traxler, Victoria J. Madden, G. Lorimer Moseley, Johan W.S. Vlaeyen 2019, 'Modulating pain thresholds through classical conditioning', PeerJhttps://peerj.com/articles/6486.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Our results reveal a novel form of the auditory fear memory depending on striatal neurons at the low-intensity unconditioned stimulus.
Ayumi Kishioka, Fumiaki Fukushima, Tamae Ito, Hirotaka Kataoka, Hisashi Mori, ToshioIkeda, Shigeyoshi Itohara, Kenji Sakimura, Masayoshi Mishina 2009, 'A Novel Form of Memory for Auditory Fear Conditioning at a Low-Intensity UnconditionedStimulus', PLoS ONE10.1371/journal.pone.0004157. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
We propose that these are functional equivalents of neurons in the mammalian pallial amygdala, mediating the conditioned stimulus–unconditioned stimulus association.
Pradeep Lal, Hideyuki Tanabe, Maximiliano L. Suster, Deepak Ailani, Yuri Kotani, AkiraMuto, Mari Itoh, Miki Iwasaki, Hironori Wada, Emre Yaksi, Koichi Kawakami 2018, 'Identification of a neuronal population in the telencephalon essential for fear conditioningin zebrafish', BMC Biologyhttp://link.springer.com/article/10.1186/s12915-018-0502-y. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)