Specialization of the motor system in infancy: From broad tuning to selectively specialized purposeful actions
D'Souza, H.; Cowie, D.; Karmiloff-Smith, A.; Bremner, A.
Professor Dorothy Cowie email@example.com
In executing purposeful actions, adults select sufficient and necessary limbs. But infants often move goal-irrelevant limbs, suggesting a developmental process of motor specialization. Two experiments with 9- and 12-month-olds revealed gradual decreases in extraneous movements in non-acting limbs during unimanual actions. In Experiment 1, 9-month-olds produced more extraneous movements in the non-acting hand/arm and feet/legs than 12-month-olds. In Experiment 2, analysis of the spatiotemporal dynamics of infants’ movements revealed developmental declines in the spatiotemporal coupling of movements between acting and non-acting arms. We also showed that the degree of specialization in infants’ unimanual actions is associated with individual differences in motor experience and visual attention, indicating the experience-dependent and broad functional nature of these developmental changes. Our study provides important new insights into motor development: as in cognitive domains, motor behaviours are initially broadly tuned to their goal, becoming progressively specialized during the first year of life.
D'Souza, H., Cowie, D., Karmiloff-Smith, A., & Bremner, A. (2016). Specialization of the motor system in infancy: From broad tuning to selectively specialized purposeful actions. Developmental Science, 20(4), Article e12409. https://doi.org/10.1111/desc.12409
|Journal Article Type||Article|
|Acceptance Date||Jan 4, 2016|
|Online Publication Date||Jun 2, 2016|
|Publication Date||Jun 2, 2016|
|Deposit Date||May 24, 2016|
|Publicly Available Date||Jun 2, 2017|
|Peer Reviewed||Peer Reviewed|
Accepted Journal Article
This is the accepted version of the following article: D'Souza, H., Cowie, D., Karmiloff-Smith, A. and Bremner, A. J. (2016), Specialization of the motor system in infancy: from broad tuning to selectively specialized purposeful actions. Developmental Science, which has been published in final form at https://doi.org/10.1111/desc.12409. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
You might also like
The role of hand size in body representation: a developmental investigation
My virtual self: the role of movement in children's sense of embodiment
Pedunculopontine Nucleus Deep Brain Stimulation for Parkinsonian Disorders: A Case Series.