How does an analog model improve internal validity? analog models ensure that participants don't know which group they're in, so that extraneous variables are less likely to have an impact. analog models create different research groups and make sure that every person in the study has an equal chance of placement within any group. analog models ensure that results apply to everyone with a particular disorder, improving internal validity. analog models re-create phenomena in the controlled conditions of the laboratory, holding constant the extraneous variables that could affect the outcomes of the study?