Abstract
Background:
In recent years, the effect of cognitive abilities on the achievements of cochlear
implant (CI) users has been evaluated. Some studies have suggested that gaps between
CI users and normal-hearing (NH) peers in cognitive tasks are modality specific, and
occur only in auditory tasks.
Purpose:
The present study focused on the effect of learning modality (auditory, visual) and
auditory feedback on word memory in young adults who were prelingually deafened and
received CIs before the age of 5 yr, and their NH peers.
Research Design:
A production effect (PE) paradigm was used, in which participants learned familiar
study words by vocal production (saying aloud) or by no-production (silent reading
or listening). Words were presented (1) in the visual modality (written) and (2) in
the auditory modality (heard). CI users performed the visual condition twice—once
with the implant ON and once with it OFF. All conditions were followed by free recall
tests.
Study Sample:
Twelve young adults, long-term CI users, implanted between ages 1.7 and 4.5 yr, and
who showed ≥50% in monosyllabic consonant-vowel-consonant open-set test with their
implants were enrolled. A group of 14 age-matched NH young adults served as the comparison
group.
Data Collection and Analysis:
For each condition, we calculated the proportion of study words recalled. Mixed-measures
analysis of variances were carried out with group (NH, CI) as a between-subjects variable,
and learning condition (aloud or silent reading) as a within-subject variable. Following
this, paired sample t tests were used to evaluate the PE size (differences between aloud and silent words)
and overall recall ratios (aloud and silent words combined) in each of the learning
conditions.
Results:
With visual word presentation, young adults with CIs (regardless of implant status
CI-ON or CI-OFF), showed comparable memory performance (and a similar PE) to NH peers.
However, with auditory presentation, young adults with CIs showed poorer memory for
nonproduced words (hence a larger PE) relative to their NH peers.
Conclusions:
The results support the construct that young adults with CIs will benefit more from
learning via the visual modality (reading), rather than the auditory modality (listening).
Importantly, vocal production can largely improve auditory word memory, especially
for the CI group.
Key Words
auditory feedback - cochlear implants - memory - production effect - study modality
