According to associative learning to learn, one has to associate stimuli and responses or to associate stimuli. There are two types of associative learning: classical conditioning and operant conditioning.
The classic conditioning was the Russian researcher Ivan Pavlov who, by studying the dog's digestive reflexes, discovered a form of learning present in humans and other animals.
The operant conditioning was the American researcher Rufus Skinner who develops an experience that will lead you to discover the way so many of our learnings are processed and maintained.
The ruling in Roe v. Wade made state laws outlawing abortion unconstitutional. The ruling did still allow states to place some restrictions on the practice, such as not allowing abortions in third trimester.
