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Although routinely used, control group criteria vary considerably in research. Drawing from aspects in our normative study on musical emotion perception, we show how a group of participants who would normally be considered a control group in most studies, display clear event-related potential (ERP) differences when grouped by affective assessment scores that are rarely administered to presumed "control" group candidates. This preliminary finding demonstrates the importance of careful screeningdoi:10.4236/wjns.2014.44036 fatcat:dtmegkjb5jdj3fqqbpyontv234