Research on Pavlovian conditioning has found that acquisition of a conditional response is fastest when the CS precedes the US by ½ second. This finding illustrates which of Hume's laws of association?

Question

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Hume's law of contiguity states that things that occur together in time and space are likely to be associated, and research on Pavlovian conditioning supports this law by showing that acquisition of a conditional response is fastest when the conditioned stimulus (CS) and unconditioned stimulus (US) are presented in close temporal contiguity (i.e., the CS precedes the US by ½ second).

Research on Pavlovian Conditioning Has Found That Acquisition of a Conditional