from Current topics in latent inhibition research
Published online by Cambridge University Press: 04 August 2010
Introduction: effects of time and context on latent inhibition
Despite its apparent simplicity, the phenomenon of latent inhibition (LI) represents one of the most sophisticated and flexible mechanisms that organisms with complex nervous systems have developed through evolution to ensure efficient interaction with the environment. Because the environment is constantly changing, mechanisms that determine the processing of a neutral stimulus depend on a large range of different circumstances. In this chapter we will focus on the role played by two factors, namely, time and context, that seemingly affect LI separately, as well as in combination. The impact of these factors (both apart and conjointly) on LI is still one of the greatest challenges to associative theories of learning.
In any learning process there is a series of elements that determine the intensity and type of association that is formed. In the case of classical conditioning, some of the parameters on which Pavlov (1927) concentrated in his original studies were related to the temporal contiguity between stimuli (e.g., whether the stimuli involved in the pairings were presented simultaneously or sequentially, or the order in their presentation when presented sequentially), as well as to the excitatory vs. inhibitory nature of the association acquired under different treatments. Some other elements that have subsequently demonstrated their relevance to associative learning were also pointed out by Pavlov, although sometimes in a quite intuitive manner. For example, he mentioned that conditioned reflexes could be affected by the surrounding stimuli during conditioning in the animal's environment.
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