 A 2011 study conducted at the University of Virginia and published in the journal Pediatrics suggested that allowing preschool @-@ aged audiences to watch the series caused short @-@ term disruptions in mental function and attention span due to frequent shot changes . A Nickelodeon executive responded in an interview that the series was not intended for an audience of that age and that the study used " questionable methodology and could not possibly provide the basis for any valid findings that parents could trust " . 
