The right hemisphere of a person who has had a split-brain operation can no longer perceive sensory information. understand verbal instructions. The effects of the split-brain operation suggest that consciousness developed in the right hemisphere. A researcher concluded that a drug made animals eat because it altered the insulin level in their blood. Darwin's theory of evolution suggests that all of an organism's characteristics are given to it by its creator. Behavior cannot be studied using tissue cultures or computers.
Computer research can replace animal research if the results are interpreted cautiously.
The results of research using tissue cultures can be more reliably replicated that the results of research using animals. Most professional physiological psychologists work in industry.