
Where a Conditioned Response is produced by a Conditioned
Stimulus similar to the original Conditioned Stimulus e.g. A smaller 
bell
 
     

 
Where a Conditioned Response is not produced by a Conditioned
Stimulus that is too different to the original Conditioned Stimulus e.g. a
buzzer rather than a bell
 

 
Where the Conditioned Response ceases to be produced when the
Conditioned Stimulus is repeatedly presented without the original Unconditioned
Stimulus e.g. bell rung many times without food
 

After response becomes extinct it may start up again if
animal is returned to training condition
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