Truly random and traditional control procedures in CER conditioning in the rat

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Studied the effects of preexposure to truly random (tr) and to traditional single-stimulus control treatments on subsequent acquisition of an estes-skinner cer in 132 male hooded rats. When a high-density tr schedule was employed, the tr cs appeared to acquire excitatory properties, which facilitated cer acquisition; other control treatments tended to retard subsequent cer acquisition. When a low-density tr schedule was employed, the tr cs retarded subsequent cer acquisition to a greater degree than did prior exposure to either cs or ucs alone. The low-density tr schedule, unlike an explicitly unpaired treatment, did not produce a cs with conditioned inhibitory properties. Results indicate that properties of the cs used in a tr control procedure depend upon variables associated with stimulus density. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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