Conditioning in pigs as a function of the interval between CS and US

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The effect of length of CS-US interval on efficiency of classical conditioning in swine was investigated. In the 1st experiment independent groups were tested with intervals of .5, 1, 1.5, and 2 sec. A control condition received CS-only and US-only trials. The 2-sec. condition gave reliably better conditioning than all other intervals. In the 2nd experiment the CS-US intervals were 1, 2, 4, and 8 sec. During early trials conditioning was best for intervals of 1 and 2 sec., but late in training conditioning was best for 4 and 8 sec. These results conflict with those for human Ss and for fish. (21 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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