Jane had leukemia as a child and had to undergo numerous bouts of chemotherapy. she had associated the waiting room with nausea. now 35 years old, she had to take her mother to the same hospital for breast cancer treatment. she became nauseous while in the waiting room with her mother. her nausea best illustrates:

The nausea is considered to be an unconditioned response. An unconditioned response occurs when it is associated with an unconditioned stimulus causing a response to naturally occur in which would be classified as an unconditioned response after it has been previously associated with the unconditioned stimulus.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's