Alejandro Lopez Valdes

Alejandro Lopez Valdes
Trinity College Dublin | TCD · Department of Electronic and Electrical Engineering

BSc, MSc, PhD

About

13
Publications
1,907
Reads
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94
Citations
Additional affiliations
July 2021 - present
Trinity College Dublin
Position
  • Professor (Assistant)
Description
  • Assistant Professor in Neural Engineering and Brain Health
August 2016 - July 2021
Eriksholm Research Centre
Position
  • PostDoc Position
Description
  • Research activities towards improving brain-hearing abilities.
September 2012 - August 2016
Trinity College Dublin
Position
  • PhD Student
Description
  • Investigating the clinical applicability of single channel electrophysiology in cochlear implant users.

Publications

Publications (13)
Article
Full-text available
Cochlear implants (CIs) can partially restore functional hearing in deaf individuals. However, multiple factors affect CI listener's speech perception, resulting in large performance differences. Non-speech based tests, such as spectral ripple discrimination, measure acoustic processing capabilities that are highly correlated with speech perception...
Article
Recent evidence suggests that late auditory evoked potentials (LAEP) provide a useful objective metric of performance in cochlear implant (CI) subjects. However, the CI produces a large electrical artifact that contaminates LAEP recordings and confounds their interpretation. Independent component analysis (ICA) has been used in combination with mul...
Article
Full-text available
With increasing numbers undergoing intervention for hearing impairment at a young age, the clinical need for objective assessment tools of auditory discrimination abilities is growing. Amplitude modulation (AM) sensitivity has been known to be an important factor for speech recognition particularly among cochlear implant (CI) users. It therefore wo...
Conference Paper
Full-text available
A cochlear implant (CI) can partially restore hearing in patients with severe to profound sensorineural hearing loss. Proper programming and evaluation of the CIs are key aspects determining success in the restoration of hearing for patients. Recent evidence suggests that cortical auditory evoked potentials, elicited via an unattended oddball parad...
Article
Objectives: Actively following a conversation can be demanding and limited cognitive resources must be allocated to the processing of speech, retaining and encoding the perceived content, and preparing an answer. The aim of the present study was to disentangle the allocation of effort into the effort required for listening (listening effort) and t...
Article
Objectives: It is well established that sequential bilateral implantation offers functional benefits in speech in noise and sound localisation, although it can be challenging to get long-term unilateral users to adapt to the second implant. The aim of this study was to investigate programming differences between the two cochlear implants that can...
Conference Paper
Full-text available
Localizing sounds in our environment is a fundamental perceptual ability. However, methods to assess sound localization ability are often cumbersome, requiring large speaker array systems. In adults with sensorineural hearing loss who are fitted with cochlear implant (CIs), sound localization is known to improve when bilateral CIs are used compared...
Poster
Full-text available
Spectral Ripple Discrimination (SRD) thresholds correlate reasonably well with speech perception outcomes as early as switch on date. SRD and speech correlate better in the quiet condition. This effect may be attributed to the fact that speech perception in noise develops at a slower rate. Non-linguistic SRD may be used in clinic as an indicator of...
Poster
Full-text available
Here,weaimedtoutilizespectrallyripplednoisestimuliincombinationwithamismatchwaveformparadigm(MMW)andanacousticchangeparadigm(ACC),toassesstheirfeasibilityasneuralmetricsofspectralresolutioninCIusers.
Poster
Full-text available
Here we aimed to utilize spectral rippled noise stimuli in combination with a mismatch negativity (MMN) paradigm to develop a neural metric of spectral resolution in CI users.
Conference Paper
Full-text available
A cochlear implant (CI) can partially restore hearing in patients with severe to profound sensorineural hearing loss. However, the large outcome variability in CI users prompts the need for more objective measures of speech perception performance. Electrophysiological metrics of CI performance may be an important tool for audiologists in the assess...

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