However , in this sensory preconditioning experiment the extinction of CS1 transferred to CS2 , suggesting an associative chain explanation whereby CS2 -- > CS1 -- > UCS -- > Response .
Normally , this CS1 extinction does not affect the CR to CS2 .
In this sensory preconditioning experiment the extinction of CS1 transferred to CS2 , suggesting an associative chain explanation whereby CS2 -- > CS1 -- > UCS -- > Response .
Normally , this CS1 extinction does not affect the CR to CS2 .