Motor asymmetries in the human newborn are state dependent but independent of position in space
2000 (English)In: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106, Vol. 134, no 3, 378-384 p.Article in journal (Refereed) Published
Human newborns have a preference for turning and maintaining the head to one side of the body. Most studies confirm a right-sided preference in supine. Few have addressed the state dependency of this lateral bias, and even fewer have examined whether it is also expressed in the semi-upright position. We investigated whether it varies as a function of behavioural state and position in space. Kinematic recordings of head movements were made with the newborn secured on a platform in the supine or semi-upright position, which alleviated biomechanical and postural constraints imposed by gravity. Newborns differed as to whether they had a vertex, Caesarean or breech delivery. The majority of infants maintained a right-sided preference in both positions, but it was strongly mediated by state. Delivery type did not account for any lateral bias. These findings provide convincing evidence that a lateral bias in movement and positioning of the head are reflections of active neural processes rooted in the regulation of state.
Place, publisher, year, edition, pages
2000. Vol. 134, no 3, 378-384 p.
human newborns, head position preference, head movements, behavioural state, delivery type
Social Sciences Medical and Health Sciences Neurosciences
Research subject Psychology; Developmental Neurosciences
IdentifiersURN: urn:nbn:se:umu:diva-63354DOI: 10.1007/s002210000467ISI: 000089608500011OAI: oai:DiVA.org:umu-63354DiVA: diva2:581805