Thehumanbrainisknowntobeinfluencedbyenvironmentalstimuli(Feeneyetal.,1982;Kaplan,1988).Therefore,researchonthebrainactivationpatternbyexternalstimulihasbeenanimportanttopicinneuroscience(Kaplan,1988).Chewinggumhasbeenknowntohaveapositiveeffectoncognition,includingalertness,attention,cognitiveprocessingspeed,