PMID- 17324050 OWN - NLM STAT- MEDLINE DCOM- 20070405 LR - 20070227 IS - 0735-7044 (Print) IS - 0735-7044 (Linking) VI - 121 IP - 1 DP - 2007 Feb TI - Time and stimulus specificity in extinction of the conditioned nictitating membrane response in the rabbit (Oryctolagus cuniculus). PG - 50-62 AB - The present experiments demonstrated that, in the rabbit nictitating membrane preparation, a conditioned response (CR) can be selectively eliminated in one portion of a conditioned stimulus (CS) while it is still paired with the unconditioned stimulus (US). Rabbits were initially trained with two stimuli (tone, light). Each was paired with the US by using a mixture of two CS-US interstimulus intervals (ISIs): 200 ms and 1,200 ms in Experiment 1; 150 ms and 500 ms in Experiment 2. The CRs showed double peaks, one for each ISI. Subsequently, one CS (A) was trained with only the longer ISI, whereas the other CS (B) continued to be trained with both ISIs. Consequently, the CR peak based on the shorter ISI disappeared for CSA but not for CSB. The later CR peaks during both CSA and CSB were maintained. These results support time-based models of conditioning. Implications for proposed mechanisms of extinction are discussed. CI - Copyright (c) 2007 APA, all rights reserved. FAU - Joscelyne, A AU - Joscelyne A AD - School of Psychology, University of New South Wales, Sydney, NSW, Australia. FAU - Kehoe, E James AU - Kehoe EJ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Behav Neurosci JT - Behavioral neuroscience JID - 8302411 SB - IM MH - *Acoustic Stimulation MH - Adaptation, Physiological MH - Animals MH - Conditioning, Classical/*physiology MH - *Extinction, Psychological MH - Female MH - Nictitating Membrane/*physiology MH - Rabbits MH - Reaction Time/*physiology MH - Time Factors EDAT- 2007/02/28 09:00 MHDA- 2007/04/06 09:00 CRDT- 2007/02/28 09:00 PHST- 2007/02/28 09:00 [pubmed] PHST- 2007/04/06 09:00 [medline] PHST- 2007/02/28 09:00 [entrez] AID - 2007-02025-005 [pii] AID - 10.1037/0735-7044.121.1.50 [doi] PST - ppublish SO - Behav Neurosci. 2007 Feb;121(1):50-62. doi: 10.1037/0735-7044.121.1.50.