Mental representations of and adaptation to speech transmitted via cochlear implants: How the impoverished signal finds its way to the mental lexicon

Mental representations of and adaptation to speech transmitted via cochlear implants: How the impoverished signal finds its way to the mental lexicon - MARCI

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

NL-OMON

Registry ID

NL-OMON44011

Enrollment

268

Registered

2013-09-16

Start date

2013-12-16

Completion date

Unknown

Last updated

2024-04-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

cochlear Implant users Hard of hearing

Interventions

None listed

Eligibility

Age

18 Years to 99 Years

Inclusion criteria

Inclusion criteria: Native speakers of Dutch Between 18-80 years old Part I: users of cochlear implants (CI) with a minimum of 6 months of experience Part II: new users of CI

Exclusion criteria

Exclusion criteria: Dyslexia Non-native speakers of Dutch

Design outcomes

Primary

Measure	Time frame
The behavioural experiments will test listeners* discrimination sensitivity within and between phoneme categories (Exp. 1), and lexical effects on phoneme identifications (Exp. 3). The ERP recordings will measure participants* Acoustic Change Complex (ACC) for the stimuli used in Exp. 1 (Exp. 2), and the Phonological Mapping Negativity (PMN) for stimuli used in Exp. 3 (Exp. 4). The primary outcomes in Study I will be (1) a correlation between listeners* psychometric functions (Exp. 1) and ACC, and (2) the normative data for lexical effects collected in Exp. 3 and 4. The outcome of the eye-tracking experiment will be (1) normative data in form of growth curves of looks towards a target, and (2) correlation between individual and data from Exps. 3 and 4. The primary outcome in the longitudinal observation is a measure of adaptation and change in ACC, PMN, and working memory load while processing speech through CIs. This combination of measures will allow for a systematic investigation of speech processing at various levels in a within-subject design. Through such a novel approach we will account for individual variability in speech perception (e.g., Hazan & Rosen, 1991), which can be assumed to be particularly high for the target population.	—

Measure

Time frame

The behavioural experiments will test listeners* discrimination sensitivity within and between phoneme categories (Exp. 1), and lexical effects on phoneme identifications (Exp. 3). The ERP recordings will measure participants* Acoustic Change Complex (ACC) for the stimuli used in Exp. 1 (Exp. 2), and the Phonological Mapping Negativity (PMN) for stimuli used in Exp. 3 (Exp. 4). The primary outcomes in Study I will be (1) a correlation between listeners* psychometric functions (Exp. 1) and ACC, and (2) the normative data for lexical effects collected in Exp. 3 and 4. The outcome of the eye-tracking experiment will be (1) normative data in form of growth curves of looks towards a target, and (2) correlation between individual and data from Exps. 3 and 4. The primary outcome in the longitudinal observation is a measure of adaptation and change in ACC, PMN, and working memory load while processing speech through CIs. This combination of measures will allow for a systematic investigation of speech processing at various levels in a within-subject design. Through such a novel approach we will account for individual variability in speech perception (e.g., Hazan & Rosen, 1991), which can be assumed to be particularly high for the target population.

—

Secondary

Measure	Time frame
none	—

Countries

Netherlands

Outcome results