Categorical perception has been shown in the perception of all of the following except ___

Rousseau's philosophy included which of the following two influential concepts?

A) stage and maturation B) evolution and stage C) natural selection and survival of the fittest D) maturation and natural selection

A pediatrician has prescribed a trial of stimulant medication to deal with eight-year-old Sal's problems in paying attention in school. When his parents ask about the expected time frame for the effects, what will they be told?

a) The drug will begin to have an effect within 30 minutes and it will wear off within 4 to 6 hours. b) It will take several hours before the drug has an initial observable effect, which will last for several more hours. c) The drug will have its initial effect within 24 hours and it will last for approximately 24 hours before another dose is needed. d) It will take several days for the drug to build in the system before it has an effect, which will last for several days after the initial doses.