Hand Preference In Rela.on to Hand Skill at 2 Yearshands.fiu.edu/ICIS16_Hartstein.pdf · Lauren E....
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Cheerio Task – Fine Motor Assessment Hand Preference In Rela.on to Hand Skill at 2 Years Lauren E. Hartstein 1 , Vishakha Agrawal 1 , Eliza L. Nelson 2 , Neil E. Berthier 1 1 University of MassachuseGs Amherst, 2 Florida InternaJonal University Development of Handedness • Consistent hand preference for acquiring objects emerges by 10-11 months of age in roughly 50% of infants 1 . • However, 11-to-14-month olds show no clear differences in hand skill between the preferred and non-preferred hand 2 . • By 24 months of age, nearly 100% of children exhibit a consistent hand preference for role- differenJated bimanual manipulaJon (RDBM) 3 . • Research has suggested that adults increase the use of the preferred hand when skill is required, such as in complex manipulaJon tasks 4 . How are hand preference and skill related at 2 years of age, a .mepoint when most children exhibit a consistent hand use paCern? RDBM Task – Hand Preference Assessment References 1. Michel, G. F., Babik, I., Sheu, C.- F., & Campbell, J. M. (2014). Latent classes in the developmental trajectories of infant handedness. Developmental Psychobiology, 50(2), 349-359. 2. Nelson, E. L., Konidaris, G. D., & Berthier, N. E. (2014). Hand preference status and reach kinemaJcs in infants. Infant Behavior and Development, 37, 615-623. 3. Nelson, E. L., Campbell, J. M., & Michel, G. F. (2013). Unimanual to bimanual: Tracking the development of handedness from 6 to 24 months. Infant Behavior & Development, 36(2), 181–188. 4. Bryden, P. J. (2015). The influence of M. P. Bryden’s work on lateralizaJon of motor skill: Is the preferred hand selected for and beGer at tasks requiring a high degree of skill? Laterality, 1-17. • Two-year-olds showed longer reach Jmes to an object with their preferred hand, which may be indicaJve of more care and precision. • This relaJonship followed a linear trajectory, in that stronger right-lateralizaJon lead to longer reach Jmes. • Two-year-olds fiGed a ball into the aperture more quickly with their preferred hand, showing finer coordinaJon with that hand. • Results also support a relaJon between right hand use and tasks requiring precision. • Future work should examine right hand skill in addiJonal lej-handers and those with no clear hand preference. By 2 years, a rela+onship emerges between hand preference and skill. high Conclusions Hand preference distribuJon • 20 children had a right hand preference for RDBM. • One child had a lej hand preference and 1 child had no hand preference. Bee Task – Fine Motor Assessment Method: • A beehive toy with a circular aperture on the top is placed at child’s midline, and a spherical “bee” is placed in front of the child’s lej or right hand. • The child is asked to put the bee into the beehive. • Reach Jme to the bee, Jme to grasp, and Jme to transfer the bee to the hole were coded. Results: • HI was significantly correlated with reach Jme for the preferred hand (r= .50, p= .03). • As parJcipants became more right dominant, their reach Jme with their right hand was longer. 60 70 80 90 100 400 500 600 700 Handedness Index Reach Time Preferred Hand (ms) N=18 Method: • A cup with a cheerio is placed in front of child, either in line with the lej or right hand, or at midline. • Reach Jme to the cup, Jme to grasp, and Jme to transfer the cheerio to the mouth were coded. Results: • Only 7 parJcipants contributed sufficient data for analysis (mulJple reaches with each hand). • No significant differences in Jme between hands was found on any stage of the acJon. • Large differences in grasp Jme with much shorter grasps with the preferred hand were observed, but not significant, possibly due to insufficient power. • HI did not predict whether child was more likely to reach with lej or right hand to cup placed at midline. Results: Preferred Hand Non-Preferred Hand 0 200 400 600 Reach Time (ms) Preferred Hand Non-Preferred Hand 0 200 400 600 800 1000 Grasp and Transfer Time (ms) Method: • 22 parJcipants aged 23 to 25 months. • Given 29 role-differenJated bimanual manipulaJon (RDBM) tasks to complete in which the object must be steadied with one hand and manipulated with the other hand (e.g. hold pouch, remove toy from inside). 4 • A Handedness Index (HI) was calculated for each child using the formula HI = # Right hand responses/Total * • Children had a marginally longer reach Jme with preferred hand. • During grasp and transfer, reach Jmes were significantly shorter with the preferred hand. Preferred Hand Non-Preferred Hand 0 100 200 300 400 Reach Time (ms) Preferred Hand Non-Preferred Hand 0 1000 2000 3000 Grasp Time (ms) Preferred Hand Non-Preferred Hand 0 200 400 600 800 Transfer Time (ms) N=7 N=7 N=7 N=19 N=19 N=22
Transcript of Hand Preference In Rela.on to Hand Skill at 2 Yearshands.fiu.edu/ICIS16_Hartstein.pdf · Lauren E....
CheerioTask–FineMotorAssessment
HandPreferenceInRela.ontoHandSkillat2Years
LaurenE.Hartstein1,VishakhaAgrawal1,ElizaL.Nelson2,NeilE.Berthier11UniversityofMassachuseGsAmherst,2FloridaInternaJonalUniversity
DevelopmentofHandedness
• Consistenthandpreferenceforacquiringobjectsemergesby10-11monthsofageinroughly50%ofinfants1.
• However,11-to-14-montholdsshownocleardifferencesinhandskillbetweenthepreferredandnon-preferredhand2.
• By24monthsofage,nearly100%ofchildrenexhibitaconsistenthandpreferenceforrole-differenJatedbimanualmanipulaJon(RDBM)3.
• Researchhassuggestedthatadultsincreasetheuseofthepreferredhandwhenskillisrequired,suchasincomplexmanipulaJontasks4.
Howarehandpreferenceandskillrelatedat2yearsofage,a.mepoint
whenmostchildrenexhibitaconsistenthandusepaCern?
RDBMTask–HandPreferenceAssessment
References
1. Michel,G.F.,Babik,I.,Sheu,C.-F.,&Campbell,J.M.(2014).Latentclassesinthedevelopmentaltrajectoriesofinfanthandedness.DevelopmentalPsychobiology,50(2),349-359.
2. Nelson,E.L.,Konidaris,G.D.,&Berthier,N.E.(2014).HandpreferencestatusandreachkinemaJcsininfants.InfantBehaviorandDevelopment,37,615-623.
3. Nelson,E.L.,Campbell,J.M.,&Michel,G.F.(2013).Unimanualtobimanual:Trackingthedevelopmentofhandednessfrom6to24months.InfantBehavior&Development,36(2),181–188.
4. Bryden,P.J.(2015).TheinfluenceofM.P.Bryden’sworkonlateralizaJonofmotorskill:IsthepreferredhandselectedforandbeGerattasksrequiringahighdegreeofskill?Laterality,1-17.
• Two-year-oldsshowedlongerreachJmestoanobjectwiththeirpreferredhand,whichmaybeindicaJveofmorecareandprecision.
• ThisrelaJonshipfollowedalineartrajectory,inthatstrongerright-lateralizaJonleadtolongerreachJmes.
• Two-year-oldsfiGedaball
intotheaperturemorequicklywiththeirpreferredhand,showingfinercoordinaJonwiththathand.
• ResultsalsosupportarelaJonbetweenrighthanduseandtasksrequiringprecision.
• FutureworkshouldexaminerighthandskillinaddiJonallej-handersandthosewithnoclearhandpreference.
By2years,arela+onshipemerges
betweenhandpreferenceandskill.
high
Conclusions
HandpreferencedistribuJon
• 20childrenhadarighthandpreferenceforRDBM.
• Onechildhadalejhandpreferenceand1childhadnohandpreference.
BeeTask–FineMotorAssessmentMethod:• Abeehivetoywithacircularapertureonthetopis
placedatchild’smidline,andaspherical“bee”isplacedinfrontofthechild’slejorrighthand.
• Thechildisaskedtoputthebeeintothebeehive.• ReachJmetothebee,Jmetograsp,andJmeto
transferthebeetotheholewerecoded.
Results:
• HIwassignificantlycorrelatedwithreachJmeforthepreferredhand(r=.50,p=.03).
• AsparJcipantsbecamemorerightdominant,theirreachJmewiththeirrighthandwaslonger.
60 70 80 90 100
400
500
600
700
Handedness Index
Rea
ch T
ime
Pref
erre
d H
and
(ms)
N=18
Method:• Acupwithacheerioisplacedinfrontofchild,either
inlinewiththelejorrighthand,oratmidline.• ReachJmetothecup,Jmetograsp,andJmeto
transferthecheeriotothemouthwerecoded.
Results:
• Only7parJcipantscontributedsufficientdataforanalysis(mulJplereacheswitheachhand).
• NosignificantdifferencesinJmebetweenhandswasfoundonanystageoftheacJon.
• LargedifferencesingraspJmewithmuchshortergraspswiththepreferredhandwereobserved,butnotsignificant,possiblyduetoinsufficientpower.
• HIdidnotpredictwhetherchildwasmorelikelytoreachwithlejorrighthandtocupplacedatmidline.
Results:
Preferred Hand Non-Preferred Hand0
200
400
600
Rea
ch T
ime
(ms)
Preferred Hand Non-Preferred Hand0
200
400
600
800
1000
Gra
sp a
nd T
rans
fer T
ime
(ms)
Method:• 22parJcipantsaged23to25months.
• Given29role-differenJatedbimanualmanipulaJon(RDBM)taskstocompleteinwhichtheobjectmustbesteadiedwithonehandandmanipulatedwiththeotherhand(e.g.holdpouch,removetoyfrominside).4
• AHandednessIndex(HI)wascalculatedforeachchildusingtheformulaHI=#Righthandresponses/Total
*• Childrenhadamarginallylonger
reachJmewithpreferredhand.
• Duringgraspandtransfer,reachJmesweresignificantlyshorterwiththepreferredhand.
Preferred Hand Non-Preferred Hand0
100
200
300
400
Rea
ch T
ime
(ms)
Preferred Hand Non-Preferred Hand0
1000
2000
3000
Gra
sp T
ime
(ms)
Preferred Hand Non-Preferred Hand0
200
400
600
800
Tran
sfer
Tim
e (m
s)
N=7
N=7
N=7
N=19 N=19
N=22
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