Two experiments assessed the effects of extinguishing a conditioned cue on subsequent context conditioning. Each experiment used a different video-game method where sensors predicted attacking spaceships and participants responded to the sensor in a way that prepared them for the upcoming attack. In Experiment 1 extinction of a cue which signaled…

Learning to ignore irrelevant stimuli is essential to achieving efficient and fluid attention, and serves as the complement to increasing attention to relevant stimuli. The different cholinergic (ACh) subsystems within the basal forebrain regulate attention in distinct but complementary ways. ACh projections from the substantia innominata/nucleus…

The NMDA receptor partial agonist d-cycloserine (DCS) enhances the extinction of learned fear in rats and exposure therapy in humans with anxiety disorders. Despite these benefits, little is known about the mechanisms by which DCS promotes the loss of fear. The present study examined whether DCS augments extinction retention (1) through reductions…

In four conditioned taste aversion experiments with rats as subjects, the effects of extinguished or pre-exposed flavors on retardation and summation tests was compared. Experiment 1 showed that when steps were taken to ensure similar exposure to the target flavor in all conditions, acquisition after pre-exposure and reacquisition after extinction…

The method of transfer learning was manipulated in a study of proactive inhibition. Results suggest that the joint recall of two lists during transfer increases list differentiation and reduces competition between alternative sets of responses on the retention test. (Editor/RK)

Two experiments found reduced proactive inhibition when subjects were induced to use the nonpreferred components of a compound stimulus during first-list learning. (Editor)

Two hundred sixty-five subjects learned a mixed list of paired associates in an AB, AD and AB, CD transfer paradigm. Two levels of semantic processing were factorially varied across original and interpolated pairs. Recall of original pairs was shown to be directly related to the processing depth of original pairs in both paradigms and inversely…