
Alejandro Lopez ValdesTrinity College Dublin | TCD · Department of Electronic and Electrical Engineering
Alejandro Lopez Valdes
BSc, MSc, PhD
About
24
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Introduction
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Publications
Publications (24)
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...
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...
Hearing impairment alters the sound input received by the human auditory system, reducing speech comprehension in noisy multi-talker auditory scenes. Despite such difficulties, neural signals were shown to encode the attended speech envelope more reliably than the envelope of ignored sounds, reflecting the intention of listeners with hearing impair...
Social interaction and cooperation are fundamental and necessary aspects of human life. With recent research showing that brains synchronize while performing cooperative tasks, this paper aims to delve deeper and investigate the underlying drivers of the synchronization evoked during a collaborative task. By quantifying the group dynamics elicited...
EEG-enabled earbuds represent a promising frontier in brain activity monitoring beyond traditional laboratory testing. Their discrete form factor and proximity to the brain make them the ideal candidate for the first generation of discrete non-invasive brain–computer interfaces (BCIs). However, this new technology will require comprehensive charact...
Electroencephalography (EEG) enabled earbuds represent a promising frontier in evaluating brain activity beyond traditional laboratory settings. However, these devices need more comprehensive characterization before widespread health related usage. A toolbox was developed to facilitate and expand the assessment of ear-EEG devices. The first compone...
Hearing impairment alters the sound input received by the human auditory system, reducing speech comprehension in noisy multi-talker auditory scenes. Despite such challenges, attentional modulation on the envelope tracking in multi-talker scenarios is comparable between normal hearing (NH) and hearing impaired (HI) participants, with previous resea...
Background
Hearing and vision loss is highly prevalent in residents with dementia (RwD) living in long-term care (LTC) facilities. Sensory loss often has a negative impact on quality of life and other dementia-related outcomes. Optimising sensory function may improve dementia-related outcomes in LTC facilities. The SENSE-Cog Residential Care pilot...
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...
The human body is autonomous and self-controlled. It can coordinate and regulate all the activities in the body through various systems. Most of the systems are governed via some inherently generated and propagated stimuli otherwise known as biomedical signals. Biomedical signals can be broadly classified into electrical and non-electrical biomedic...
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...
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...
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...
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...
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...
Here,weaimedtoutilizespectrallyripplednoisestimuliincombinationwithamismatchwaveformparadigm(MMW)andanacousticchangeparadigm(ACC),toassesstheirfeasibilityasneuralmetricsofspectralresolutioninCIusers.
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.
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...