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• W2067410975 abstract "The ability of rats to discriminate durations of exteroceptive stimuli is disrupted by 5-HT1A receptor agonists; it is not known whether temporal discrimination is sensitive to stimulation of other 5-HT receptor subtypes. We examined the effect of quipazine, a 5-HT receptor agonist with nanomolar affinity for 5-HT3 receptors and micromolar affinity for 5-HT2A receptors, and m-chlorophenylbiguanide (m-CPBG), a selective 5-HT3 receptor agonist, on temporal discrimination. Twenty-four rats pressed levers for sucrose reinforcement under a discrete-trials psychophysical procedure. In each 50-s trial, a light was presented for t s, following which two levers (A and B) were presented. A response on A was reinforced if t<25 s, and a response on B if t>25 s. Logistic psychometric functions were fitted to the data, and timing parameters estimated (T50: value of t corresponding to %B=50; Weber fraction: [T75−T25]/2T50, where T75 and T25 are values of t corresponding to %B=75 and %B=25). Quipazine (0.5–2 mg/kg) displaced the psychometric curve to the right and reduced its slope, reflected in increases in T50 and the Weber fraction; m-CPBG (2.5–10 mg/kg) had no effect. The effects of quipazine were reversed by the 5-HT2A receptor antagonist ketanserin (2 mg/kg) but not by the 5-HT3 receptor antagonist topanyl 3,5-dichlorobenzoate (MDL-72222) (1 mg/kg). The results indicate that 5-HT2A but not 5-HT3 receptor stimulation disrupts temporal discrimination." @default.
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• W2067410975 date "2005-02-01" @default.
• W2067410975 modified "2023-10-03" @default.
• W2067410975 title "Effects of quipazine and m-chlorophenylbiguanide (m-CPBG) on the discrimination of durations: evidence for the involvement of 5-HT2A but not 5-HT3 receptors" @default.
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• W2067410975 doi "https://doi.org/10.1097/00008877-200502000-00005" @default.
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