Answer:classical conditioning is used to define and understand the behavioural response by animals and humans to certain stimulus .
It looks at the natural unconditioned stimulus that produces unconditioned responses and neutral previous stimulus that may lead to conditioned response .
What is an unconditioned stimulus this is a stimulus that triggers a reaction or response from a person or an animal without the involvement of an outside source , so it occurs naturally.
For example when one cuts an onion they get tear drop from their eyes , this occurs natural .
Onion here is referred to as an unconditioned stimulus whilst the tears that comes from your face when you cut it are referred to as unconditioned response.
You find yourself shedding those tears naturally not because you are sad or something has upset you .
Over time you may find yourself shedding those tears when you see a knife which is usually used to cut onions , a knife here is a previously neutral stimulus which now triggers a conditioned response because you know a knife is associated with cutting onion when you see it it now triggers the same response as that triggered by an unconditioned stimulus, now a knife can be referred to as a conditioned stimulus.
It is a conditioned stimulus because this reaction it cause is dependent on the fact that it is associated with the unconditioned stimulus (onion)
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