| Summary: | The aim of the experiments reported in this thesis was to establish if the US is susceptible to learned changes in stimulus effectiveness (a notion well established for the CS). In Chapter Two a shock was preexposed followed by either consistent or inconsistent post-US events (or outcomes). It was found that a shock was less effective as a US hi a subsequent conditioning procedure when it was followed by an inconsistent, rather than a consistent, outcome m preexposure. This effect was observed whether the outcome was varying (that is, sometimes a clicker sometimes a noise stunulus) or partial (a clicker or noise stimulus occurring on only half of the trials).
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