References and Acknowledgements Results and Discussion Methods • Par9cipants: 59 children (29 females) completed the RDBM hand preference task during 1824 month visits, and returned at 36 months for a language assessment. • Language : Language was assessed at 36 months using the Preschool Language Scales (PLS5; Zimmerman et al., 2011). The PLS5 has 2 subscales: Expressive CommunicaSon and Auditory Comprehension. • Latent class growth analysis idenSfied 4 trajectories for RDBM handedness based on HI scores as shown in Figure 2: (1) consistent leZ hand preference (8.5%), (2) mixed leZ hand preference (14.5%), (3) mixed right hand preference (24%), and (4) consistent right hand preference (53%). 1824 months Handedness Predicts 36 months Expressive Language Skills S. L. Gonzalez 1 , E.L. Nelson 1 , J.M. Campbell 2 , E.C. Marcinowski 2 , S. Coxe 1 , & G.F. Michel 2 1 Department of Psychology, Florida InternaSonal University 2 Department of Psychology, University of North Carolina at Greensboro N = 13 • Mixed preference and consistent preference groups were combined for analyses, and independent samples ttests compared the mixed preference group (38.4%) and the consistent preference group (61.6%) on PLS5 total and subscale scores. • Children with a consistent hand preference trajectory had significantly higher PLS5 total scores compared to children with a mixed hand preference trajectory [t(54) = 2.394, p = .02, d = .70]. • Figure 3 shows children with a consistent hand preference trajectory scored significantly higher on the PLS5 Expressive CommunicaSon subscale [t(46.55)= 3.281, p = .002, d =.88]. There was no significant difference between trajectory groups and PLS5 Auditory Comprehension scores [t(54) = 1.627, p = .110, d = 0.47]. 1 0.75 0.5 0.25 0 0.25 0.5 0.75 1 18 19 20 21 22 23 24 HI Age Mixed Right Consistent Right Mixed LeZ Consistent LeZ 0 25 50 75 100 125 PLS5 Expressive PLS5 Comprehension PLS5 zscore Consistent Preference Mixed Preference Fig.1. RDBM ac9on. * Fig. 2. Handedness trajectories from 18 to 24 months. Fig. 3. Handedness trajectories on language skills at 36 months. TakeHome Point : Consistency in handedness for RDBM acSons from 1824 months relates to language skill at 36 months. Specifically, expressive language ability, but not comprehension, accounts for this relaSonship. We would like to acknowledge the families who have graciously parScipated in this longitudinal project and the members of the Infant Development Center and HANDS Lab who have helped in data collecSon and coding. Correspondence to: Sandy Gonzalez (sgonz219@fiu.edu). 1 Nelson et al. (2013). DOI: 10.1037/a0033803 Supported by NIH/NICHD grant T32 HD007376 to ELN and a travel award from NIH, the Sackler InsStute, and ISDP to SLG. Background and Aims • Previous longitudinal work found that a consistent right hand preference for object acquisiSon in infancy (6 to 14 months) predicted advanced language ability at 24 months. 1 • Here we are reporSng on handedness trajectories for role differenSated bimanual manipulaSon (RDBM) when children were toddlers (18 to 24 months) and language outcomes at 36 months in an extended sample. • Previously, we were unable to parse language skill into language comprehension and expressive language abiliSes. • Our aim was to (1) examine whether handedness trajectories conSnue to be linked to later language outcomes and (2) assess the contribuSon of comprehension and expressive abiliSes to the link between motor skills and language ability. • RDBM Hand Preference : Hand preference for RDBM was measured from 7 lab visits between 1824 months of age. Figure 1 shows an example of an RDBM acSon. Hand preference was calculated using the Handedness Index [HI=(RL)/R+L)].
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References and Acknowledgements
Results and Discussion
Methods
• Par9cipants: 59 children (29 females) completed the RDBM hand preference task during 18-‐24 month visits, and returned at 36 months for a language assessment.
• Language: Language was assessed at 36 months using the Preschool Language Scales (PLS-‐5; Zimmerman et al., 2011). The PLS-‐5 has 2 subscales: Expressive CommunicaSon and Auditory Comprehension.
• Latent class growth analysis idenSfied 4 trajectories for RDBM handedness based on HI scores as shown in Figure 2: (1) consistent leZ hand preference (8.5%), (2) mixed leZ hand preference (14.5%), (3) mixed right hand preference (24%), and (4) consistent right hand preference (53%).
18-‐24 months Handedness Predicts 36 months Expressive Language Skills
S. L. Gonzalez1, E.L. Nelson1, J.M. Campbell2, E.C. Marcinowski2, S. Coxe1, & G.F. Michel2
1Department of Psychology, Florida InternaSonal University 2Department of Psychology, University of North Carolina at Greensboro N = 13
N = 25 11 N = 14
• Mixed preference and consistent preference groups were combined for analyses, and independent samples t-‐tests compared the mixed preference group (38.4%) and the consistent preference group (61.6%) on PLS-‐5 total and subscale scores.
• Children with a consistent hand preference trajectory had significantly higher PLS-‐5 total scores compared to children with a mixed hand preference trajectory [t(54) = -‐2.394, p = .02, d = .70].
• Figure 3 shows children with a consistent hand preference trajectory scored significantly higher on the PLS-‐5 Expressive CommunicaSon subscale [t(46.55)= -‐3.281, p = .002, d =.88]. There was no significant difference between trajectory groups and PLS-‐5 Auditory Comprehension scores [t(54) = -‐1.627, p = .110, d = 0.47].
-‐1
-‐0.75
-‐0.5
-‐0.25
0
0.25
0.5
0.75
1
18 19 20 21 22 23 24
HI
Age
Mixed Right Consistent Right
Mixed LeZ Consistent LeZ
0
25
50
75
100
125
PLS-‐5 Expressive PLS-‐5 Comprehension
PLS-‐5 z-‐score
Consistent Preference Mixed Preference
Fig.1. RDBM ac9on.
*
Fig. 2. Handedness trajectories from 18 to 24 months. Fig. 3. Handedness trajectories on language skills at 36 months.
Take-‐Home Point: Consistency in handedness for RDBM acSons from 18-‐24 months relates to language skill at 36 months. Specifically, expressive language ability, but not comprehension, accounts for this relaSonship.
We would like to acknowledge the families who have graciously parScipated in this longitudinal project and the members of the Infant Development Center and HANDS Lab who have helped in data collecSon and coding. Correspondence to: Sandy Gonzalez ([email protected]).
1Nelson et al. (2013). DOI: 10.1037/a0033803 Supported by NIH/NICHD grant T32 HD-‐007376 to ELN and a travel award from NIH, the Sackler InsStute, and ISDP to SLG.
Background and Aims
• Previous longitudinal work found that a consistent right hand preference for object acquisiSon in infancy (6 to 14 months) predicted advanced language ability at 24 months.1
• Here we are reporSng on handedness trajectories for role-‐differenSated bimanual manipulaSon (RDBM) when children were toddlers (18 to 24 months) and language outcomes at 36 months in an extended sample.
• Previously, we were unable to parse language skill into language comprehension and expressive language abiliSes.
• Our aim was to (1) examine whether handedness trajectories conSnue to be linked to later language outcomes and (2) assess the contribuSon of comprehension and expressive abiliSes to the link between motor skills and language ability.
• RDBM Hand Preference: Hand preference for RDBM was measured from 7 lab visits between 18-‐24 months of age. Figure 1 shows an example of an RDBM acSon. Hand preference was calculated using the Handedness Index [HI=(R-‐L)/R+L)].
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