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dc.contributor.authorMorasch, Katherine Colonaen
dc.date.accessioned2014-03-14T20:10:14Zen
dc.date.available2014-03-14T20:10:14Zen
dc.date.issued2007-04-13en
dc.identifier.otheretd-04202007-152907en
dc.identifier.urihttp://hdl.handle.net/10919/27065en
dc.description.abstractOne of the most intriguing and enduring issues in contemporary developmental cognitive neuroscience centers on the development of the ability to remember past experiences and the neural systems which support this capacity. Over the past 25 years, through methodological advancements and direct challenges to established assumptions, the focus of this developmental question has shifted to highlight the second half of the first year of life as the time when true explicit memory functionally emerges and begins to rapidly develop. The purpose of the following study was to test specific hypotheses regarding the biobehavioral development of explicit memory during infancy and present a new approach to studying the behavioral and physiological expression of this system. This study, which was guided by hypothesized neural substrates of this memory system, is the first direct investigation of continuous brain electrical activity during both the encoding and retrieval phases of explicit memory processing in infants. Memory-related differences in behavior and task-related brain activity in individual cortical areas were of particular interest. The results of this study provided some support for the hypothesis that baseline-to-task changes in EEG power can distinguish between successful and unsuccessful ordered-recall memory. Specifically, decreases in brain-electrical activity relative to a baseline period were found at both frontal and temporal locations during stimulus encoding and retrieval for infants who failed the recall tests. However, either no change, or increases in EEG power at frontal and temporal sites was related to successful performance on this task. In addition, different patterns of brain-electrical activity were present for correct and incorrect responses from the same child. This study contributes to our understanding of the biobehavioral expression of infant explicit memory in three main ways. First, changes in both frontal and temporal lobe activity are directly involved in explicit memory processing both during event encoding as well as retrieval. Second, this work provides evidence of a developmentally appropriate and valid pattern of electrophysiology specific to explicit memory processing. Finally, this study bridges the gap between a classic behavioral task of infant memory (which has been conceptually linked to neuropsychological data) and current developmental cognitive neuroscience.en
dc.publisherVirginia Techen
dc.relation.haspartMorasch_IRB.pdfen
dc.relation.haspartMorasch_ETD.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectexplicit memoryen
dc.subjectEEGen
dc.subjectdevelopmental cognitive neuroscienceen
dc.subjectinfanten
dc.titleExplicit Memory and Brain-Electrical Activity in 10-month-old Infantsen
dc.typeDissertationen
dc.contributor.departmentPsychologyen
dc.description.degreePh. D.en
thesis.degree.namePh. D.en
thesis.degree.leveldoctoralen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplinePsychologyen
dc.contributor.committeechairBell, Martha Annen
dc.contributor.committeememberDeater-Deckard, Kirbyen
dc.contributor.committeememberHoffman, Kurt A.en
dc.contributor.committeememberSmith, Cynthia L.en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04202007-152907/en
dc.date.sdate2007-04-20en
dc.date.rdate2010-10-08en
dc.date.adate2007-05-03en


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