After he was spanked on several occasions for spilling his milk at a restaurant, colin became afraid to go to the restaurant. in this case, spanking was a(n) for colin's fear. question 4 options:

In this case,spanking was an unconditioned stimulus for colin's fear.
unconditioned stimulus refers to the type of situation that naturally trigger a response without having to be learn (because it triggers something biological rather than environmental such as physical pain, the feeling of hunger, reflexive respinse, etc)

The jugular vein located, on an animal, starts proximally at the base of the neck and moving towards the head along the jugular groove.