from Current topics in latent inhibition research
Published online by Cambridge University Press: 04 August 2010
What one knows and what one shows: acquisition vs. performance
Since the time of Aristotle, it has been commonly assumed that two events occurring in close proximity become associated to each other. This learning by contiguity is a central determinant of the phenomenon of classical conditioning, in which a neutral target stimulus (X) is repeatedly presented in close proximity to a stimulus that unconditionally produces a response (i.e., an unconditioned stimulus, US), with the consequence that X comes to elicit a response appropriate to the US. That is, X becomes a conditioned stimulus (CS) that produces a conditioned response (CR). However, there have been reports of various conditions under which CS–US pairings fail to result in an acquired response to the CS. For example, even though pairings of X and the US ordinarily result in a robust CR (i.e., acquisition), X will fail to gain response potential if it is trained in the presence of another, more salient CS, A (i.e., overshadowing; Pavlov,1927). Thus, even though the contiguity between CS X and the US is the same in the X–US acquisition and AX–US overshadowing conditions, the resulting behavioral control by CS X is not. An easy explanation for this difference is that subjects did not acquire an X–US association in the overshadowing condition.
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