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Cortical processing of visual motion in young infants
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
2007 (English)In: Vision Research, ISSN 0042-6989, E-ISSN 1878-5646, Vol. 47, no 12, 1614-1623 p.Article in journal (Refereed) Published
Abstract [en]

High-density EEG was used to investigate the cortical processing of a rotatirig visual pattern in 2-, 3-, and 5-month-old infants and in adults. Motion induced ERP in the parietal and the temporal-occipital border regions (OT) was elicited at all ages. The ERP was discernable in the 2-months-olds, significant and unilateral in the 3-month-olds and significantly bilateral in the 5-month-olds and adults. The motion induced ERP in the primary visual area was absent in the 2-month-olds and later than in the OT area for the 3-month-olds indicating that information to OT may be supplied by the VI bypass at these ages. The results are in agreement with behavioural and psychophysical. data in infants.

Place, publisher, year, edition, pages
2007. Vol. 47, no 12, 1614-1623 p.
National Category
Psychology Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-97378DOI: 10.1016/j.visres.2007.03.004ISI: 000247058300006OAI: oai:DiVA.org:uu-97378DiVA: diva2:172299
Available from: 2008-08-18 Created: 2008-08-18 Last updated: 2011-02-09Bibliographically approved
In thesis
1. From Motion to Movements: Revelations by the Infant EEG
Open this publication in new window or tab >>From Motion to Movements: Revelations by the Infant EEG
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The introduction of high density EEG (hd-EEG) nets for easy application on subjects of all ages has improved the possibilities to investigate the development of the infant neurophysiology. This dissertation consists of three studies (I – III) that investigate the visual motion system and mirror neuron system of the infant, and methodological sections that outline the bioelectrical background and the characteristics of the methods used.

Study I covers the maturation of cortical areas involved in motion perception in adults and infants using an ERP paradigm. Over three age groups (2, 3 and 5 month olds) the cortical activation increased dramatically. All infant groups showed significant activation when moving displays was contrasted to static displays on a video screen. The study shows that 5-month-old infants and older can be expected to process motion in a similar fashion as adults.

Study II covers the infant mirror neuron system (MNS). In adults the mu rhythm perturbations is considered a reliable measure of activation of the MNS. This study presented both a mu rhythm analysis and a ERP analysis to detect MNS activity in 6-month-olds and in adults. This study concludes that the infant MNS can be measured using ERPs and that the development of mu rhythm perturbations requires further study.

Study III focused on exploring the mu rhythm suppressions. 8-month-olds observed a live actor that performed goal directed reaches and non-goal directed hand movements. The results show robust mu rhythm perturbations time-locked to the grasping moment. The study concluded that the MNS activity is possible to evaluate by analysis of mu rhythm perturbations and that the MNS show mature characteristics at the age of 8 months.

In summary, Study 2 and 3 present new methods to investigate the infant mirror neuron system and shows that the infant MNS is active at 6 months of age. At 8 months of age the infant MNS show mature EEG responses to simple actions such as reaching. How the MNS development relates to the infants’ motor development, and how the MNS interacts with the development of social skills requires further studies that could benefit from the methods presented here.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 87 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences, ISSN 1652-9030 ; 41
Keyword
Psychology, infant, brain, EEG, mirror neurons, ERP, ICA, MNS, Psykologi
Identifiers
urn:nbn:se:uu:diva-9067 (URN)978-91-554-7243-6 (ISBN)
Public defence
2008-09-08, Sal IV, Universitetshuset, Övre Slottsgatan 2, Uppsala, 13:15
Opponent
Supervisors
Available from: 2008-08-18 Created: 2008-08-18Bibliographically approved

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