As a result, the CS1, which is not associated
directly with the UCS, becomes able to evoke the conditioned
response which is the same one elicited by the UCS.
In the present study we examined the effects of spaced
training and massed training procedures on the sensory
preconditioning, particularly on the memory retention. It is
well known in psychology that spaced training, interposing
a rest interval between the multiple training sessions,
produces stronger and longer-lasting memory than massed