The ability to follow an individual conversation due to the "cocktail party effect" involves ___ of the competing conversations, presumably due to the action of the ___

Because knowing the true nature of a study may bias a participant's behavior and

invalidate the findings, researchers sometimes a. postpone informed consent until the subject's participation in the study is over. b. skip debriefing altogether. c. use deception. d. do not promise confidentiality to the participants. e. counterbalance the administration of the independent variable.

When a neuron is polarized, ______

a. both positive and negative ions are concentrated outside the neural membrane b. positive ions are concentrated outside the neural membrane while negative ions are concentrated inside the membrane c. negative ions are concentrated outside the neural membrane while positive ions are concentrated inside the membrane d. both positive and negative ions are concentrated inside the neural membrane