6. Samantha's cat salivates in response to the taste of food in its mouth. Each morning, Samantha places the cat's food on the back porch. When the door to the porch opens, a bell rings. So, each time Samantha opens the door the bell rings. Now, Samantha's cat salivates when the bell rings. What is the unconditioned stimulus in this example?

To take a standard test such as the psat or plan students must have an

Personality traits.. .remain stable throughout life ..change at different rates to different degrees ..are more obvious during childhood ..all of the above

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups. b. a researcher conducts a linguistic study of comments posted on a local public blog. c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression. d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.