Newborn Perceptual Motor Behaviour: Difference between revisions

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== Introduction ==
== Introduction ==
Infant motor behaviour relies on perception or taking in and organising sensory information and feedback from prior movement patterns or experiences. Learning new motor skills affords infants new opportunities to interact with caregivers and their environment.  Infant socialisation with their caregiver and environment shapes their developmental path by affecting the learning of new skills and when those skills will appear.<ref name=":0">Adolph KE, Franchak JM. T[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5182199/ he development of motor behavior.] Wiley Interdisciplinary Reviews: Cognitive Science. 2017 Jan;8(1-2):e1430.</ref>  
Newborn infants when they are awake and alert and lying on a firm surface respond to visual and auditory events in the environment and actively engage in spontaneous movements of the limbs. The looking, listening and moving provides opportunities for linking what they do to what is seen, heard and felt, creating the perception-action loops that are the basis for making the shift from spontaneous exploratory movements to intentional, goal directed actions that allow the infant to interact with people, things and events in their environment.<ref>Versfeld, P. SfA Infant Perceptual Motor Development</ref>
 
== Limb Movement Synergies at Birth ==
[[File:Newborn perceptual motor synergies.jpg|right|frameless]]
The multi-segmented structure of the body provides the basis for producing the varied movement patterns seen in human actions. To simplify control of the many degrees of freedom inherent in a multi-segmented body, spontaneous infant movements are constrained and organised into synergies.<ref>Von Hofsten C. Mastering reaching and grasping: The development of manual skills in infancy. InAdvances in psychology 1989 Jan 1 (Vol. 61, pp. 223-258). North-Holland.</ref>
 
* Lower limb synergy pattern includes intralimb coupling of
** hip flexion, knee flexion and dorsiflexion
** hip extension and knee extension
 
*
 
* Upper limb synergy pattern includes a combination of
** shoulder and elbow extension with extension of the fingers and wrist;
** flexion of the elbow with finger flexion.<ref name=":1" />


== Movements ==
== Movements ==
Line 26: Line 40:


== Posture ==
== Posture ==
Good postural control enables infants to perform a range of tasks that serve a function in motor development.<ref>Pin TW, Butler PB, Cheung HM, Shum SL. [https://bmcpediatr.biomedcentral.com/articles/10.1186/s12887-018-1153-4 Segmental Assessment of Trunk Control in infants from 4 to 9 months of age-a psychometric study]. BMC paediatrics. 2018 Dec;18(1):1-8.</ref> Movement of the extremities follows sufficient postural control.<ref name=":0" /> Varying postures facilitate or reduce physical interactions with objects, caregivers and the environment.<ref name=":0" /> <ref name=":3">Thurman SL, Corbetta D. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473077/ Changes in posture and interactive behaviors as infants progress from sitting to walking: a longitudinal study]. Frontiers in psychology. 2019 Apr 12;10:822.</ref> When infants are prone, one hand is needed to lift the torso, leaving only one hand to manipulate objects.<ref name=":0" /> Having to focus on balance will limit object manipulations.<ref name=":3" /> Contrastingly, in sitting the infant is free to use both hands to explore and play increasing possibilities of action.<ref name=":0" /> Continuous trial and error learning exploration increases the infant’s ability to choose the best motor strategies.<ref name=":7">Sigmundsson H, Lorås HW, Haga M. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5408080/#B15 Exploring task-specific independent standing in 3-to 5-month-old infants. Frontiers in psychology.] 2017 Apr 28;8:657.</ref> Due to visual and social benefits, infants have a preference for upright postures.<ref name=":7" /> As infants age and with increased experiences, more adaptive postural responses emerge. One study demonstrated that even 3-5-month-olds can perform task-specific standing by adjusting their posture. The participants in this study stood with a stiff posture which is a common theme when learning a new motor skill. With continued trial and error, freezing posture is replaced by more flexibility, which in turn increases postural control.<ref name=":7" />
Good postural control enables infants to perform a range of tasks that serve a function in motor development.<ref>Pin TW, Butler PB, Cheung HM, Shum SL. [https://bmcpediatr.biomedcentral.com/articles/10.1186/s12887-018-1153-4 Segmental Assessment of Trunk Control in infants from 4 to 9 months of age-a psychometric study]. BMC paediatrics. 2018 Dec;18(1):1-8.</ref> Movement of the extremities follows sufficient postural control.<ref name=":0">Adolph KE, Franchak JM. T[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5182199/ he development of motor behavior.] Wiley Interdisciplinary Reviews: Cognitive Science. 2017 Jan;8(1-2):e1430.</ref> Varying postures facilitate or reduce physical interactions with objects, caregivers and the environment.<ref name=":0" /> <ref name=":3">Thurman SL, Corbetta D. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473077/ Changes in posture and interactive behaviors as infants progress from sitting to walking: a longitudinal study]. Frontiers in psychology. 2019 Apr 12;10:822.</ref> When infants are prone, one hand is needed to lift the torso, leaving only one hand to manipulate objects.<ref name=":0" /> Having to focus on balance will limit object manipulations.<ref name=":3" /> Contrastingly, in sitting the infant is free to use both hands to explore and play increasing possibilities of action.<ref name=":0" /> Continuous trial and error learning exploration increases the infant’s ability to choose the best motor strategies.<ref name=":7">Sigmundsson H, Lorås HW, Haga M. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5408080/#B15 Exploring task-specific independent standing in 3-to 5-month-old infants. Frontiers in psychology.] 2017 Apr 28;8:657.</ref> Due to visual and social benefits, infants have a preference for upright postures.<ref name=":7" /> As infants age and with increased experiences, more adaptive postural responses emerge. One study demonstrated that even 3-5-month-olds can perform task-specific standing by adjusting their posture. The participants in this study stood with a stiff posture which is a common theme when learning a new motor skill. With continued trial and error, freezing posture is replaced by more flexibility, which in turn increases postural control.<ref name=":7" />


== Head Control ==
== Head Control ==

Revision as of 05:35, 14 May 2022

Original Editor - Robin Tacchetti based on the course by Pam Versfeld

Top Contributors - Robin Tacchetti, Robin Leigh Tacchetti, Tarina van der Stockt, Ewa Jaraczewska, Kim Jackson and Jess Bell  

Introduction[edit | edit source]

Newborn infants when they are awake and alert and lying on a firm surface respond to visual and auditory events in the environment and actively engage in spontaneous movements of the limbs. The looking, listening and moving provides opportunities for linking what they do to what is seen, heard and felt, creating the perception-action loops that are the basis for making the shift from spontaneous exploratory movements to intentional, goal directed actions that allow the infant to interact with people, things and events in their environment.[1]

Limb Movement Synergies at Birth[edit | edit source]

Newborn perceptual motor synergies.jpg

The multi-segmented structure of the body provides the basis for producing the varied movement patterns seen in human actions. To simplify control of the many degrees of freedom inherent in a multi-segmented body, spontaneous infant movements are constrained and organised into synergies.[2]

  • Lower limb synergy pattern includes intralimb coupling of
    • hip flexion, knee flexion and dorsiflexion
    • hip extension and knee extension
  • Upper limb synergy pattern includes a combination of
    • shoulder and elbow extension with extension of the fingers and wrist;
    • flexion of the elbow with finger flexion.[3]

Movements[edit | edit source]

Newborn general movements are described as writhing until about 2 months old. Voluntary, goal-directed functional movements replace spontaneous movement around 3 months old. Infants aged between 3 and 5 months will begin to reach out for objects.[4]

Hip and knee flexion

Newborn lower limb posture assumes a flexed posture. The hip and knee flexors present with increased tone due to the tight space in utero. Restriction in hip extension is referred to as hip flexion contracture. Upper limb posture for newborns is slight external rotation, elbow flexion with the hands slightly open. Spontaneous movements of the arm bring the hand into contact with the face.[3]

Synergies[edit | edit source]

Muscle synergies, the activation of muscle groups, are the basis for newborn motor control. As infants age and become toddlers and then adults, muscle synergies increase and become more complex.[5] Productive movement implementation can be achieved by combining muscle synergies.[6] Research shows that muscle synergies are innate, but acquiring new tasks may demand fine-tuning of the early synergies.[7] Pam Versfeld[3] describes infant upper and lower limb synergies as follows:

  • Lower limb synergy pattern: hip flexion, knee flexion and dorsiflexion; hip extension, knee extension.
  • Upper limb synergy pattern: shoulder, elbow extension with extension of the fingers and wrist; flexion of the elbow with finger flexion.[3]

Combining muscle synergies is valuable to development, skilled motor tasks and postural control.[6]

Posture[edit | edit source]

Good postural control enables infants to perform a range of tasks that serve a function in motor development.[8] Movement of the extremities follows sufficient postural control.[9] Varying postures facilitate or reduce physical interactions with objects, caregivers and the environment.[9] [10] When infants are prone, one hand is needed to lift the torso, leaving only one hand to manipulate objects.[9] Having to focus on balance will limit object manipulations.[10] Contrastingly, in sitting the infant is free to use both hands to explore and play increasing possibilities of action.[9] Continuous trial and error learning exploration increases the infant’s ability to choose the best motor strategies.[11] Due to visual and social benefits, infants have a preference for upright postures.[11] As infants age and with increased experiences, more adaptive postural responses emerge. One study demonstrated that even 3-5-month-olds can perform task-specific standing by adjusting their posture. The participants in this study stood with a stiff posture which is a common theme when learning a new motor skill. With continued trial and error, freezing posture is replaced by more flexibility, which in turn increases postural control.[11]

Head Control[edit | edit source]

During the first year of life, postural stability develops rapidly as infants learn to control their head and trunk.[12]  Controlling the head is a precursor for more advanced motor development. Newborns have limited control of their head. In supine, they can maintain their head in the midline when observing a visual event, but tend to turn their head to one side when at rest.[3] In prone, newborns can briefly lift their head against gravity. During the second month of life, infants can hold their head up in prone and in a supported sitting.[3]  Between 3-4 months of age, infants can stabilise their head using visual information to reach and grasp[13] The video below by Pediatric Physical Therapy Exercises demonstrates head control in an infant:

[14]


Visual Perception[edit | edit source]

Moving eyes in the direction of a target is referred to as visual perception. Pointing eyes to a specific location involves coordinating the body, head and eyes to the target. Newborns who lack head control can only view whatever is in their line of vision. Young infants track larger targets that move in predictable ways. Smaller and faster targets can be tracked once the infant has had many months of practice.[9] 

Imitation[edit | edit source]

Imitating the action of others is a powerful learning tool for infants.[15] [13] Through imitation of behaviour, postures, vocalisations and action on objects they acquire new knowledge.[15] Cause and effect, properties of objects and the actions of others are all learning skills infants gain through imitation. As they imitate others, they learn about themselves, their abilities, similarities to others and their own characteristics. Research shows that who and what when is imitated and when is chosen by the infant in a deliberate and selective manner. In addition, infants choose trustworthy and friendly models to imitate. Studies show that infants will less likely imitate a behaviour linked to negative emotion.[13] Very shortly after birth, infants will imitate adult behaviour. Pam Versfeld[3] describes some ways infants mimic others including: mouth opening, tongue protruding, sequential finger movements and head-turning. The video below by Lund University demonstrates how babies mimic others:

[16]

Reaching[edit | edit source]

Good postural support enables infants to interact within their environment by reaching and grasping.[9] [17] Reaching supersedes grasping.[17] Initially, reaching movements are jerky and infants may overshoot or undershoot the target. A 3-month-old will typically bat at objects because they do not have the hand control necessary for grasping. When infants begin using their hands to grasp, they tend to bring the object to their face for mouthing or looking. Manual grasping skills advance to squeezing, rotating and transferring objects from hand to hand.[9] Reaching and grasping objects enable new social interactions between the infant and caregiver.[17] The following video by Pathways.org details typical and nontypical motor skills in a 2 month old:

[18]

Resources[edit | edit source]

References[edit | edit source]

  1. ↑ Versfeld, P. SfA Infant Perceptual Motor Development
  2. ↑ Von Hofsten C. Mastering reaching and grasping: The development of manual skills in infancy. InAdvances in psychology 1989 Jan 1 (Vol. 61, pp. 223-258). North-Holland.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Versfeld, P. Newborn Perceptual Motor Behaviour Course. Physioplus. 2021
  4. ↑ Ouss L, Le Normand MT, Bailly K, Leitgel Gille M, Gosme C, Simas R, Wenke J, Jeudon X, Thepot S, Da Silva T, Clady X. Developmental trajectories of hand movements in typical infants and those at risk of developmental disorders: an observational study of kinematics during the first year of life. Frontiers in psychology. 2018 Feb 19;9:83.
  5. ↑ Booth AT, Van Der Krogt MM, Harlaar J, Dominici N, Buizer AI. Muscle synergies in response to biofeedback-driven gait adaptations in children with cerebral palsy. Frontiers in physiology. 2019 Sep 27;10:1208.
  6. ↑ 6.0 6.1 Saito H, Yokoyama H, Sasaki A, Kato T, Nakazawa K. Flexible recruitments of fundamental muscle synergies in the trunk and lower limbs for highly variable movements and postures. Sensors. 2021 Jan;21(18):6186.
  7. ↑ Cheung VC, Cheung BM, Zhang JH, Chan ZY, Ha SC, Chen CY, Cheung RT. Plasticity of muscle synergies through fractionation and merging during development and training of human runners. Nature communications. 2020 Aug 31;11(1):1-5.
  8. ↑ Pin TW, Butler PB, Cheung HM, Shum SL. Segmental Assessment of Trunk Control in infants from 4 to 9 months of age-a psychometric study. BMC paediatrics. 2018 Dec;18(1):1-8.
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 Adolph KE, Franchak JM. The development of motor behavior. Wiley Interdisciplinary Reviews: Cognitive Science. 2017 Jan;8(1-2):e1430.
  10. ↑ 10.0 10.1 Thurman SL, Corbetta D. Changes in posture and interactive behaviors as infants progress from sitting to walking: a longitudinal study. Frontiers in psychology. 2019 Apr 12;10:822.
  11. ↑ 11.0 11.1 11.2 Sigmundsson H, Lorås HW, Haga M. Exploring task-specific independent standing in 3-to 5-month-old infants. Frontiers in psychology. 2017 Apr 28;8:657.
  12. ↑ Pineda RG, Reynolds LC, Seefeldt K, Hilton CL, Rogers CE, Inder TE. Head lag in infancy: What is it telling us?. American Journal of Occupational Therapy. 2016 Jan 1;70(1):7001220010p1-8.
  13. ↑ 13.0 13.1 13.2 Meltzoff AN, Marshall PJ. Human infant imitation as a social survival circuit. Current Opinion in Behavioral Sciences. 2018 Dec 1;24:130-6.
  14. ↑ Pediatric Physical Therapy Exercises. Shoulders Down Sitting: Head Control for Babies, Pediatric Physical Therapy for babies #1. 2016. Available from: https://www.youtube.com/watch?v=gFK3ZegQ69Q [last accessed 7/2/2022]
  15. ↑ 15.0 15.1 Jones SS. Infants learn to imitate by being imitated. InProceedings of the International Conference on Development and Learning: The Tenth International Conference on Development and Learning 2006 Jun 3. Indiana University Bloomington, IN.
  16. ↑

    Lund University: Babies know when you imitate them - and like it. 2020. Available from https://www.youtube.com/watch?v=63u7l5-x1Hk&t=4s
  17. ↑ 17.0 17.1 17.2 Lobo MA, Harbourne RT, Dusing SC, McCoy SW. Grounding early intervention: physical therapy cannot just be about motor skills anymore. Physical therapy. 2013 Jan 1;93(1):94-103
  18. ↑ Pathways: 2 Month Old Baby Typical & Atypical Development Side by Side. 2018. Available from: https://www.youtube.com/watch?v=_0cErYu3A8Q&t=1s
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