v Vocalizationtypepermin vMaternalresponsivenesstotypeofvocalization

AlicjaRadkowska(a),Iris Nomikou (b),GiuseppeLeonardi (c),KatharinaRohfling (c) &JoannaRączaszek-Leonardi (a)

Results– repeatedmeasuresANOVA

Hypothesesv Incomparisontonon-speech-relatedvocalization,infant’samountof

speech-relatedvocalizationwillincreasewithage.vMotherswillrespondmoretospeech-relatedvocalizationsregardless

ofinfants’age(incomparisontonon-speech-relatedones).vMothersreactionstospeech-relatedvocalizationswillbequicker

regardlessofinfants’age(incomparisontonon-speech-relatedones).

Acknowledgements:ThisworkwassupportedbythebytheNCN-DFGcollaborativeBeethovenprojectEASE(2014/15/G/HS1/04536)andbyClusterofExcellenceCognitiveInteractionTechnology“CITEC”(EXC277)atBielefeldUniversityfundedbytheGermanResearchFoundation(DFG)andWarsawUniversityFoundation.Wethank theparticipating families.

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Germanlongitudinalstudyofparent– infantinteractionsStudydesign

(a) UniversityofWarsaw,(b)UniversityofPortsmouth,(c) PaderbornUniversity

Results– Cross-RecurrenceAnalysis:DiagonalProfiles

Scaffolding vocal development: maternal responsiveness to infant speechlike vocalizations at three, six and eight months

Participantsv Vocalizationtype:speech-related(SL)per

minute,non-speech-related(NS)perminutevMotherresponsivenesstovocalizationtype

within2secwindow– proportion:responsestoSL/SLvocalizations;proportion:responsestoNS/NSvocalizations;

vMeantimeofmotherresponse(MRT)tovocalizationtype:MRTtoSL,MRTtoNS

v ELFRA2– Overallproductivevocabularyat24monthsreportedbyparentsviaareport

Measuresv 16Germandyads(9boys,7girls)v Age:1st visitM=3,44;SD=0,18;Age4thvisitM=6,24;SD=0,26;Age6thvisit M=8,06,SD=0,14

Results– Cross-RecurrenceAnalysis:DiagonalProfiles

IntroductionParental responsiveness is an important feature of parent-infantinteractions for infant’s development and learning, including language.Responsiveness is also a part of a social feedback loop between parentsand children (Warlamount, Richards, Gilkerson &Oller, 2014) and mighthave consequences for their later language development (Tamis-LeMonda, Bornstein & Baumwell, 2001; Wu & Gros-Louis, 2014). Yet,most studies concerned with responsiveness to infants’ vocalizationshave investigated infants from 8 months on.

Parents are prompt to contingently respond to speech-relatedvocalizations of 8-48 months old children (Warlamount et al., 2014). Inthe present work we checked if parents promote spontaneous, speech-related sounds by timed responses even earlier in development.

We aimed to investigate longitudinally differences in parentalresponsiveness to early speech-related and non-speech-related infants’vocalizations when infants were 3, 6 and 8 months old. Furthermore, thetemporal characteristic of responses to those two types of vocalizationswas explored.

• trendformaineffectoftypeF(1,14)=4,18;p=0,06;η2 =0,23Ø SLvocalizationsrespondedto

morethanNS

• maineffectoftypeF(1,13)=4,9;p<0,05;η2 =0,27Ø MRTshorter forSLthan NS

vocalizations

• n.s.

vMeanreactiontimestovocalizationtype

Whole groupGroups:scoring high(left)or low (right)inELFRA2

Overall productive vocabulary

v For3month olds:the‘peak’forSLindiagonalprofileforwhole group is present inboth,highandlow ELFRA2groups.

v For6month olds:the‘peak’forSLintheprofileforhighELFRA2group (albeit small)which is notpresent inlow ELFRA2group;

v For8month olds:the‘peak’forSLobservable inprofileforwhole group is present inprofileforhighELFRA2group,butnotinlow ELFRA2.Mothers ofinfants inlow ELFRA2group seemed tonotdistinguish their reactions between SLandNSvocalizations.

Sample cross-recurrence plot

Conclusionsv In the 3-8 months age window infants tended to produce more speech-related

vocalizations with age in comparison to non-speech-related, but differences didn’treach significance.

vMothers showed higher responsiveness to speech-related vocalizations incomparison to non-speech-related regardless of infants’ age.

v Duration of mean reaction times of maternal responses to speech-relatedvocalizations was shorter than MRT to non-speech-related vocalizations, regardlessof the age of the infant. Taken together, these results suggest that mothers early indevelopment start to support emerging vocal communicational skills by selectiveand timed responses.

v Diagonal profiles from CRQA might be a robust method for characterization oftemporal dynamics of maternal responses to infant vocalizations.

v Early differences in maternal responses to different types of infants’ vocalizationsmay contribute to trajectories of development and later language outcomes.

Analysisv repeatedmeasuresANOVAv Cross-recurrencequantification

analysis(Dale,Warlamount &Richardson,2011)

• thelevelofrecurrencerate(%REC)wasextractedfromrecurrenceplots

• plotteddiagonal-wiserecurrenceprofiles(%RECasafunctionofthelaginawindowof± 5seconds)