Clinical trial NCT05634356: Social Influences on Sensorimotor Integration of Speech Production and Perception During Early Vocal Learning
Official title: Social Influences on Sensorimotor Integration of Speech Production and Perception During Early Vocal Learning
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Sensorineural Hearing Loss
Speech
Lead sponsor: University of Southern California
Sponsor class: OTHER
Collaborators: name: Cornell University
name: National Institute on Deafness and Other Communication Disorders (NIDCD)
First posted: 2022-12-02
Enrollment: 120
Sex: ALL
Minimum age (years): 7
Maximum age (years): 24
Standard ages: CHILD
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: We have a parallel design in which parent-infant dyads are assigned to either the intervention or to a random control group.
Primary purpose: BASIC_SCIENCE

Brief summary: The goal of this study is to investigate the role of social factors on speech learning, including production and perception, in infants ranging in age from \~7-18 months. Infants have either typical hearing or sensorineural hearing loss. The main prediction of the study is that social reinforcement will engender improvements in vocal learning above and beyond gains in hearing in infants with hearing loss. As part of this study:

* The parent and infant engage in a free play session in the playroom while the investigator cues the parent to say simple nonsense words;
* Infants hear playback of the same words during a second phase.

Detailed description: Infant vocal learning and development is embedded in a social feedback loop. Babbling vocalizations catalyze consistent responding by caregivers, and these predictable social reactions provide opportunities for infant learning. Naturalistic data and experimental manipulations have verified both the potency of babbling for eliciting social-vocal responses from caregivers, and the efficacy of social feedback for rapid advances in infant vocal learning. The impact of infant hearing loss, however, has never been studied with regard to the social feedback loop. Infants born with significant sensorineural hearing loss may be deprived not only of early auditory experience but of social experience as well. The reduction or elimination of social feedback to immature vocalizations, either by reduced or unpredictable parental responses or by infants' lessened ability to perceive those responses, is likely to have strong effects on learning and development of speech. Restoring hearing via cochlear implants improves auditory perception but does not remediate lost social learning opportunities or provide knowledge of how to learn from social partners. The goal of this project is to investigate how social interactions mediate the ability to incorporate phonological patterns of the language environment into vocal repertoires in infants with typical hearing versus infants with hearing loss (who either continue with hearing aids or experience gains in hearing via receipt of a cochlear implant). The investigators' method is to remotely observe naturally-occurring interactions between infants and a parent while recording their vocalizations; the investigators instruct the parent via headphones to provide vocal-social reinforcement to the infants when they produce a babbling utterance. Infant-parent dyads in a yoked control condition receive the same schedule of social reinforcement cues as a matched pair, which is random with respect to actual infant utterances in the control condition.

Eligibility criteria: Inclusion Criteria:

* infants ca. 7-16 months of age at study onset
* Infants less than 24 months of age (for follow-up visits only)
* At least one English-speaking or Spanish-speaking parent in the home who can participate in the study
* Subjects will include infants with typical hearing, hearing loss, or hearing loss remediated by a hearing aid or cochlear implant.

Exclusion Criteria:

* infants who are not exposed to English or Spanish in the home
* infants who do not have a parent who can participate in the study will be excluded (Caregivers who are not parents will not be eligible to participate in the study)

Primary outcomes:
measure: Change in Vocal Codes During Study Visit
timeFrame: Measured over the course of 30 minutes
Secondary outcomes:
measure: Change in Vocal Codes Between Visits
timeFrame: Measured at initial visit and up to three additional times between 30-180 days following the initial visit
measure: Perception
timeFrame: Measured at initial visit and up to three additional times between 30-180 days following the initial visit
measure: MacArthur Communicative Development Inventory
timeFrame: assessed at 16 months and/or 6 months after initial visit
Other outcomes:
Locations:
city: Los Angeles
country: United States
facility: University of Southern California
state: California
Study officials:
affiliation: University of Southern California
name: Sarah W Bottjer, Ph.D.
role: PRINCIPAL_INVESTIGATOR
References: