Final answer:
Dr. Lonsbary's study likely addresses construct validity through a manipulation check, not by using a demand characteristic, counterbalancing, or a placebo group, which serves different purposes in experimental design.
Step-by-step explanation:
Dr. Lonsbary's study likely includes the technique of a manipulation check to address a threat to construct validity. This is a procedure used to determine whether the manipulation of the independent variable has the intended effect on the participants. This would not include a demand characteristic, which is a cue that makes participants aware of what the experimenter expects to find or how participants are expected to behave, nor would it specifically refer to counterbalancing, which is used to control for the effects of the order in which treatments are administered in a repeated measures design. It is also distinct from a placebo group, which is a control group given an inert treatment to control for the placebo effect where participant expectations could influence the outcome. Utilizing a placebo group helps researchers isolate the effects of the treatment itself by balancing the effects of expectations across different groups in an experiment.