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Developmental asymmetries between horizontal and vertical tracking
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.
2006 (English)In: Vision Research, ISSN 0042-6989, E-ISSN 1878-5646, Vol. 46, no 11, 1754-1761 p.Article in journal (Refereed) Published
Abstract [en]

The development of the asymmetry between horizontal and vertical eye tracking was investigated longitudinally at 5, 7, and 9 months of age. The target moved either on a 2D circular trajectory or on a vertical or horizontal 1D sinusoidal trajectory. Saccades, smooth pursuit, and head movements were measured. Vertical tracking was found to be inferior to horizontal tracking at all age levels. The results also show that the mechanisms responsible for horizontal and vertical tracking mutually influence one another in the production of 2D visual pursuit. Learning effects were observed within-trials but no transfer between trials was found.

Place, publisher, year, edition, pages
2006. Vol. 46, no 11, 1754-1761 p.
Keyword [en]
Visual development, Infants, Visual tracking, Vertical eye movements, 2D tracking
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:uu:diva-78687DOI: 10.1016/j.visres.2005.11.007OAI: oai:DiVA.org:uu-78687DiVA: diva2:106600
Available from: 2006-03-28 Created: 2006-03-28 Last updated: 2017-01-25Bibliographically approved
In thesis
1. Visual motor development in full term and preterm infants
Open this publication in new window or tab >>Visual motor development in full term and preterm infants
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Smooth tracking and efficient reaching for moving objects require the ability to predict the velocity and trajectory of the object. This skill is important to be able to perceive human action and object motion in the world. This thesis explores early visual motor development in full term and preterm infants.

Study I showed that horizontal eye tracking develops ahead of vertical (full term infants at 5, 7 and 9 months of age). The vertical component is also more affected when a second dimension is added during circular pursuit. It is concluded that different mechanisms appear to underlie vertical and horizontal eye movements

Study II-IV compared the development of the ability to visually track and reach for moving objects in very preterm infants born <32 gestational weeks to healthy infants born at term. The development of horizontal smooth pursuit at 2 and 4 months of corrected age was delayed for the preterm group (Study II). Some infants were catching up whereas others were not improving at all. A question raised by the results was whether the delay was caused by specific injuries as a result of the prematurity. However, the delays persisted when all infants with known neonatal complications and infants born small for gestational age were excluded (Study III), indicating that they were caused by prematurity per se. At 8 months corrected age preterm and full term infants were equally good at aiming reaches and successfully catching a moving object. Nevertheless, the preterm group used a bimanual strategy more often and had a more jerky and circuitous path than the full term group (Study IV). In summary, preterm infants showed a delayed visual motor development compared to infants born at term.

The results of these studies suggest that there is additional diffuse damage to the visual motor system that is not related to neonatal complications as diagnosed today. Measuring smooth pursuit could potentially be a new method for early non-invasive diagnosis of impaired visual function.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 70 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences, ISSN 1652-9030 ; 62
Keyword
infant development, smooth pursuit, eye tracking, reaching, preterm infants
National Category
Psychology
Research subject
Psychology
Identifiers
urn:nbn:se:uu:diva-130858 (URN)978-91-554-7892-6 (ISBN)
Public defence
2010-10-29, Sydney Alrutz-salen, Blåsenhus, Von Kraemers allé 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2010-10-08 Created: 2010-09-15 Last updated: 2016-05-02Bibliographically approved

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Grönqvist, HelenaGredebäck, Gustafvon Hofsten, Claes

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