What term describes the phenomenon where the order of presenting experimental conditions influences study outcomes?

What term describes the phenomenon where the order of presenting experimental conditions influences study outcomes?

• A. Order effects
• B. Participant variables
• C. Non-equivalent groups
• D. Reactivity effects

Answer: (A)

Order effects occur when the sequence in which you present experimental conditions changes participants’ responses. In designs where the same people experience multiple conditions, factors like practice can boost performance on later tasks, fatigue can reduce it, and carryover can cause one condition to influence the next. For example, trying one study strategy first might alter motivation or attention, making the second strategy seem better or worse purely due to order. This is exactly what order effects describe. Other terms refer to different issues: participant variables are stable individual differences, non-equivalent groups are a design problem in between-subjects comparisons, and reactivity effects involve changes in behavior because participants know they are being observed. To minimize order effects, researchers counterbalance the order across participants or use randomization or Latin-square designs so each condition appears in each position roughly equally.

Order effects occur when the sequence in which you present experimental conditions changes participants’ responses. In designs where the same people experience multiple conditions, factors like practice can boost performance on later tasks, fatigue can reduce it, and carryover can cause one condition to influence the next. For example, trying one study strategy first might alter motivation or attention, making the second strategy seem better or worse purely due to order. This is exactly what order effects describe. Other terms refer to different issues: participant variables are stable individual differences, non-equivalent groups are a design problem in between-subjects comparisons, and reactivity effects involve changes in behavior because participants know they are being observed. To minimize order effects, researchers counterbalance the order across participants or use randomization or Latin-square designs so each condition appears in each position roughly equally.