On the other hand: Overflow movements of infants' hands and legs during unimanual object exploration

Kasey C. Soska, Margaret A. Galeon, Karen Adolph

Research output: Contribution to journalArticle

Abstract

Motor overflow is extraneous movement in a limb not involved in a motor action. Typically, overflow is observed in people with neurological impairments and in healthy children and adults during strenuous and attention-demanding tasks. In the current study, we found that young infants produce vast amounts of motor overflow, corroborating claims of symmetry being the default state of the motor system. While manipulating an object with one hand, all 27 of the typically developing 4.5- to 7.5-month-old infants who we observed displayed overflow movements of the free hand (on 4/5 of unimanual actions). Mirror-image movements of the hands occurred on 1/8 of unimanual actions, and the hands and legs moved in synchrony on 1/3 of unimanual acts. Motor overflow was less frequent when infants were in a sitting posture and when infants watched their acting hand, suggesting that upright posture and visual examination may help to alleviate overflow and break obligatory symmetry in healthy infants.

Original languageEnglish (US)
Pages (from-to)372-382
Number of pages11
JournalDevelopmental Psychobiology
Volume54
Issue number4
DOIs
StatePublished - May 2012

Fingerprint

Leg
Hand
Posture
Extremities

Keywords

  • Infants
  • Motor overflow
  • Object manipulation
  • Posture
  • Symmetry

ASJC Scopus subject areas

  • Developmental Biology
  • Behavioral Neuroscience
  • Developmental Neuroscience
  • Developmental and Educational Psychology

Cite this

On the other hand : Overflow movements of infants' hands and legs during unimanual object exploration. / Soska, Kasey C.; Galeon, Margaret A.; Adolph, Karen.

In: Developmental Psychobiology, Vol. 54, No. 4, 05.2012, p. 372-382.

Research output: Contribution to journalArticle

@article{e243618b18ea47f5a699841a3ebc120c,
title = "On the other hand: Overflow movements of infants' hands and legs during unimanual object exploration",
abstract = "Motor overflow is extraneous movement in a limb not involved in a motor action. Typically, overflow is observed in people with neurological impairments and in healthy children and adults during strenuous and attention-demanding tasks. In the current study, we found that young infants produce vast amounts of motor overflow, corroborating claims of symmetry being the default state of the motor system. While manipulating an object with one hand, all 27 of the typically developing 4.5- to 7.5-month-old infants who we observed displayed overflow movements of the free hand (on 4/5 of unimanual actions). Mirror-image movements of the hands occurred on 1/8 of unimanual actions, and the hands and legs moved in synchrony on 1/3 of unimanual acts. Motor overflow was less frequent when infants were in a sitting posture and when infants watched their acting hand, suggesting that upright posture and visual examination may help to alleviate overflow and break obligatory symmetry in healthy infants.",
keywords = "Infants, Motor overflow, Object manipulation, Posture, Symmetry",
author = "Soska, {Kasey C.} and Galeon, {Margaret A.} and Karen Adolph",
year = "2012",
month = "5",
doi = "10.1002/dev.20595",
language = "English (US)",
volume = "54",
pages = "372--382",
journal = "Developmental Psychobiology",
issn = "0012-1630",
publisher = "John Wiley and Sons Inc.",
number = "4",

}

TY - JOUR

T1 - On the other hand

T2 - Overflow movements of infants' hands and legs during unimanual object exploration

AU - Soska, Kasey C.

AU - Galeon, Margaret A.

AU - Adolph, Karen

PY - 2012/5

Y1 - 2012/5

N2 - Motor overflow is extraneous movement in a limb not involved in a motor action. Typically, overflow is observed in people with neurological impairments and in healthy children and adults during strenuous and attention-demanding tasks. In the current study, we found that young infants produce vast amounts of motor overflow, corroborating claims of symmetry being the default state of the motor system. While manipulating an object with one hand, all 27 of the typically developing 4.5- to 7.5-month-old infants who we observed displayed overflow movements of the free hand (on 4/5 of unimanual actions). Mirror-image movements of the hands occurred on 1/8 of unimanual actions, and the hands and legs moved in synchrony on 1/3 of unimanual acts. Motor overflow was less frequent when infants were in a sitting posture and when infants watched their acting hand, suggesting that upright posture and visual examination may help to alleviate overflow and break obligatory symmetry in healthy infants.

AB - Motor overflow is extraneous movement in a limb not involved in a motor action. Typically, overflow is observed in people with neurological impairments and in healthy children and adults during strenuous and attention-demanding tasks. In the current study, we found that young infants produce vast amounts of motor overflow, corroborating claims of symmetry being the default state of the motor system. While manipulating an object with one hand, all 27 of the typically developing 4.5- to 7.5-month-old infants who we observed displayed overflow movements of the free hand (on 4/5 of unimanual actions). Mirror-image movements of the hands occurred on 1/8 of unimanual actions, and the hands and legs moved in synchrony on 1/3 of unimanual acts. Motor overflow was less frequent when infants were in a sitting posture and when infants watched their acting hand, suggesting that upright posture and visual examination may help to alleviate overflow and break obligatory symmetry in healthy infants.

KW - Infants

KW - Motor overflow

KW - Object manipulation

KW - Posture

KW - Symmetry

UR - http://www.scopus.com/inward/record.url?scp=84859433927&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859433927&partnerID=8YFLogxK

U2 - 10.1002/dev.20595

DO - 10.1002/dev.20595

M3 - Article

C2 - 22487940

AN - SCOPUS:84859433927

VL - 54

SP - 372

EP - 382

JO - Developmental Psychobiology

JF - Developmental Psychobiology

SN - 0012-1630

IS - 4

ER -