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Featured researches published by Mary K. Fagan.


Journal of Deaf Studies and Deaf Education | 2010

Hearing Experience and Receptive Vocabulary Development in Deaf Children With Cochlear Implants

Mary K. Fagan; David B. Pisoni

This study investigated receptive vocabulary delay in deaf children with cochlear implants. Participants were 23 children with profound hearing loss, ages 6-14 years, who received a cochlear implant between ages 1.4 and 6 years. Duration of cochlear implant use ranged from 3.7 to 11.8 years. Peabody Picture Vocabulary Test, Third Edition (PPVT-III) data were analyzed first by examining childrens errors for evidence of difficulty in specific lexical content areas, and second by calculating standard scores with reference to hearing age (HA) (i.e., chronological age [CA]--age at implantation) rather than CA. Participants showed evidence of vocabulary understanding across all PPVT-III content categories with no strong evidence of disproportionate numbers of errors in any specific content area despite below-average mean standard scores. However, whereas mean standard scores were below the test mean established for hearing children when based on CA, they were within the average range for hearing children when calculated based on HA. Thus, childrens vocabulary knowledge was commensurate with years of cochlear implant experience, providing support for the role of spoken language experience in vocabulary acquisition.


Journal of Child Language | 2009

Mean Length of Utterance before words and grammar: Longitudinal trends and developmental implications of infant vocalizations

Mary K. Fagan

This study measured longitudinal change in six parameters of infant utterances (i.e. number of sounds, CV syllables, supraglottal consonants, and repetitions per utterance, temporal duration, and seconds per sound), investigated previously unexplored characteristics of repetition (i.e. number of vowel and CV syllable repetitions per utterance) and analyzed change in vocalizations in relation to age and developmental milestones using multilevel models. Infants (N=18) were videotaped bimonthly during naturalistic and semi-structured activities between 0 ; 3 and the onset of word use (M=11.8 months). Results showed that infant utterances changed in predictable ways both in relation to age and in relation to language milestones (i.e. reduplicated babble onset, word comprehension and word production). Looking at change in relation to the milestones of language development led to new views of babbling, the transition from babbling to first words, and processes that may underlie these transitions.


Journal of Experimental Child Psychology | 2015

Why repetition? Repetitive babbling, auditory feedback, and cochlear implantation

Mary K. Fagan

This study investigated the reduplicated, or repetitive vocalizations of hearing infants and infants with profound hearing loss with and without cochlear implants using a new measure of repetition in order to address questions not only about the effects of cochlear implantation on repetitive babbling, but also about the reason repetitive vocalizations occur at all and why they emerge around 7 or 8 months of age in hearing infants. Participants were 16 infants with profound hearing loss and 27 hearing infants who participated at a mean age of 9.9 months and/or a mean age of 17.7 months. Mean age at cochlear implantation for infants with profound hearing loss was 12.9 months, and mean duration of implant use was 4.2 months. The data show that before cochlear implantation, repetitive vocalizations were rare. However, 4 months after cochlear implant activation, infants with hearing loss produced both repetitive vocalizations and repetitions per vocalization at levels commensurate with their hearing peers. The results support the hypothesis that repetition emerges as a means of vocal exploration during the time when hearing infants (and infants with cochlear implants) form auditory-motor representations and neural connections between cortical areas active in syllable production and syllable perception, during the transition from nonlinguistic to linguistic vocalization.


Child Development | 2004

Infant Vocal-Motor Coordination: Precursor to the Gesture-Speech System?

Jana M. Iverson; Mary K. Fagan


Infancy | 2007

The Influence of Mouthing on Infant Vocalization

Mary K. Fagan; Jana M. Iverson


Infant Behavior & Development | 2014

Synchrony, complexity and directiveness in mothers' interactions with infants pre- and post-cochlear implantation.

Mary K. Fagan; Tonya R. Bergeson; Kourtney J. Morris


Journal of Experimental Child Psychology | 2014

Frequency of vocalization before and after cochlear implantation: Dynamic effect of auditory feedback on infant behavior

Mary K. Fagan


Journal of Speech Language and Hearing Research | 2017

Ordinary Interactions Challenge Proposals That Maternal Verbal Responses Shape Infant Vocal Development

Mary K. Fagan; Kate N. Doveikis


Archive | 2009

Developmental and Aging Aspects Perspectives on multisensory experience and cognitive development in infants with cochlear implants

Mary K. Fagan; David B. Pisoni


Archive | 2015

Spoken Vocabulary Development in Deaf Children With and Without Cochlear Implants

Mary K. Fagan

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David B. Pisoni

Indiana University Bloomington

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