ORCID Profile
0000-0002-7611-0500
Current Organisation
University of Washington
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Engineering | Biological sciences | Biomedical and clinical sciences | Bioinformatics and computational biology | Control engineering, mechatronics and robotics | Neurosciences
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Publisher: Acoustical Society of America (ASA)
Date: 11-2009
DOI: 10.1121/1.3238240
Abstract: Some past studies suggest that when sound elements are heard as one object, the spatial cues in the component elements are integrated to determine perceived location, and that this integration is reduced when the elements are perceived in separate objects. The current study explored how object localization depends on the spatial, spectral, and temporal configurations of sound elements in an auditory scene. Localization results are interpreted in light of results from a series of previous experiments studying perceptual grouping of the same stimuli, e.g., Shinn-Cunningham et al. [Proc. Natl. Acad. Sci. U.S.A. 104, 12223–12227 (2007)]. The current results suggest that the integration (pulling) of spatial information across spectrally interleaved elements is obligatory when these elements are simultaneous, even though past results show that these simultaneous sound elements are not grouped strongly into a single perceptual object. In contrast, perceptually distinct objects repel (push) each other spatially with a strength that decreases as the temporal separation between competing objects increases. These results show that the perceived location of an attended object is not easily predicted by knowledge of how sound elements contribute to the perceived spectro-temporal content of that object.
Publisher: Elsevier BV
Date: 02-2016
Publisher: Frontiers Media SA
Date: 13-03-2014
Publisher: IEEE
Date: 03-2016
Publisher: Proceedings of the National Academy of Sciences
Date: 03-10-2011
Abstract: Recognizing errors and adjusting responses are fundamental to adaptive behavior. The error-related negativity (ERN) and error-related functional MRI (fMRI) activation of the dorsal anterior cingulate cortex (dACC) index these processes and are thought to reflect the same neural mechanism. In the present study, we evaluated this hypothesis. Although errors elicited robust dACC activation using fMRI, combined electroencephalography and magnetoencephalography data localized the ERN to the posterior cingulate cortex (PCC). ERN litude correlated with fMRI activation in both the PCC and dACC, and these two regions showed coordinated activity based on functional connectivity MRI. Finally, increased microstructural integrity of the posterior cingulum bundle, as measured by diffusion tensor imaging, predicted faster error correction. These findings suggest that the PCC generates the ERN and communicates with the dACC to subserve error processing. They challenge current models that view fMRI activation of the dACC as the hemodynamic reflection of the ERN.
Publisher: eLife Sciences Publications, Ltd
Date: 23-12-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2018
Publisher: Springer Science and Business Media LLC
Date: 28-06-2013
Publisher: Proceedings of the National Academy of Sciences
Date: 17-07-2007
Abstract: Our ability to understand auditory signals depends on properly separating the mixture of sound arriving from multiple sources. Sound elements tend to belong to only one object at a time, consistent with the principle of disjoint allocation, although there are instances of duplex perception or coallocation, in which two sound objects share one sound element. Here we report an effect of “nonallocation,” in which a sound element “disappears” when two ongoing objects compete for its ownership. When a target tone is presented either as one of a sequence of tones or simultaneously with a harmonic vowel complex, it is heard as part of the corresponding object. However, depending on the spatial configuration of the scene, if the target, the tones, and the vowel are all presented together, the target may not be perceived in either the tones or the vowel, even though it is not perceived as a separate entity. This finding suggests an asymmetry in the strength of the perceptual evidence required to reject vs. to include an element within the auditory foreground, a result with important implications for how we process complex auditory scenes containing ambiguous information.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Acoustical Society of America (ASA)
Date: 03-2016
DOI: 10.1121/1.4943787
Abstract: Analysis of pupil dilation has been used as an index of attentional effort in the auditory domain. Previous work has modeled the pupillary response to attentional effort as a linear time-invariant system with a characteristic impulse response, and used deconvolution to estimate the attentional effort that gives rise to changes in pupil size. Here it is argued that one parameter of the impulse response (the latency of response maximum, tmax) has been mis-estimated in the literature a different estimate is presented, and it is shown how deconvolution with this value of tmax yields more intuitively plausible and informative results.
Publisher: Elsevier BV
Date: 2014
Publisher: Springer Science and Business Media LLC
Date: 13-05-2008
Publisher: Elsevier BV
Date: 05-2013
Publisher: Acoustical Society of America (ASA)
Date: 06-2008
DOI: 10.1121/1.2908282
Abstract: Listeners are relatively good at estimating the true content of each physical source in a sound mixture in most everyday situations. However, if there is a spectrotemporal element that logically could belong to more than one object, the correct way to group that element can be ambiguous. Many psychoacoustic experiments have implicitly assumed that when a sound mixture contains ambiguous sound elements, the ambiguous elements “trade” between competing sources, such that the elements contribute more to one object in conditions when they contribute less to others. However, few studies have directly tested whether such trading occurs. While some studies found trading, trading failed in some recent studies in which spatial cues were manipulated to alter the perceptual organization. The current study extended this work by exploring whether trading occurs for similar sound mixtures when frequency content, rather than spatial cues, was manipulated to alter grouping. Unlike when spatial cues were manipulated, results are roughly consistent with trading. Together, results suggest that the degree to which trading is obeyed depends on how stimuli are manipulated to affect object formation.
Publisher: Wiley
Date: 28-06-2023
DOI: 10.1002/AUR.2961
Abstract: Auditory processing differences, including hyper‐ or hyposensitivity to sound, aversions to sound, and difficulty listening under noisy, real‐world conditions, are commonly reported in autistic in iduals. However, the developmental course and functional impact of these auditory processing differences are unclear. In this study, we investigate the prevalence, developmental trajectory, and functional impact of auditory processing differences in autistic children throughout childhood using a longitudinal study design. Auditory processing differences were measured using the Short Sensory Profile, a caregiver questionnaire, in addition to adaptive behaviors and disruptive/concerning behaviors at 3, 6, and 9 years of age. Our results showed that auditory processing differences were reported in greater than 70% of the autistic children in our s le at all three timepoints, maintained a high prevalence through 9 years of age, and were associated with increased disruptive/concerning behaviors and difficulty with adaptive behaviors. Furthermore, in our s le of children, auditory processing differences at age 3 years predicted disruptive/concerning behaviors and difficulty with adaptive behaviors at age 9 years. These findings warrant further investigations of the potential benefit of incorporating measures of auditory processing during routine clinical evaluations as well as interventions targeting auditory processing differences in autistic children.
Publisher: Springer Science and Business Media LLC
Date: 23-01-2019
Publisher: eLife Sciences Publications, Ltd
Date: 2015
Publisher: eLife Sciences Publications, Ltd
Date: 05-02-2015
DOI: 10.7554/ELIFE.04995
Abstract: In noisy settings, listening is aided by correlated dynamic visual cues gleaned from a talker's face—an improvement often attributed to visually reinforced linguistic information. In this study, we aimed to test the effect of audio–visual temporal coherence alone on selective listening, free of linguistic confounds. We presented listeners with competing auditory streams whose litude varied independently and a visual stimulus with varying radius, while manipulating the cross-modal temporal relationships. Performance improved when the auditory target's timecourse matched that of the visual stimulus. The fact that the coherence was between task-irrelevant stimulus features suggests that the observed improvement stemmed from the integration of auditory and visual streams into cross-modal objects, enabling listeners to better attend the target. These findings suggest that in everyday conditions, where listeners can often see the source of a sound, temporal cues provided by vision can help listeners to select one sound source from a mixture.
Publisher: Elsevier BV
Date: 07-2012
Publisher: Cold Spring Harbor Laboratory
Date: 20-11-2021
DOI: 10.1101/2021.11.19.469225
Abstract: Continuous-wave functional near-infrared spectroscopy (fNIRS) neuroimaging provides an estimate of relative changes in oxygenated and de-oxygenated hemoglobin content, from which regional neural activity is inferred. The relation between both signals is governed by neurovascular coupling mechanisms. However, the magnitude of concentration changes and the contribution of noise sources to each chromophore is unique. Subsequently, it is not apparent if either chromophore signal practically provides greater information about the underlying neural state and relation to an experimental condition. To assess this question objectively, we applied a machine-learning approach to four datasets and evaluated which hemoglobin signal best differentiated between experimental conditions. To further ensure the objective nature of the analysis, the algorithm utilized all s les from the epoched data rather than pre-selected features. Regardless of experimental task, brain region, or stimulus, the oxygenated hemoglobin signal was better able to differentiate between conditions than the de-oxygenated signal. Incorporating both signals into the analysis provided no additional improvement over oxygenated hemoglobin alone. These results indicate that oxyhemoglobin is the most informative fNIRS signal in relation to experimental condition.
Publisher: Informa UK Limited
Date: 22-01-2019
Publisher: Elsevier BV
Date: 10-2011
Publisher: Cold Spring Harbor Laboratory
Date: 22-12-2020
DOI: 10.1101/2020.12.22.423886
Abstract: fNIRS is an increasingly popular tool in auditory research, but the range of analysis procedures employed across studies complicates interpretation of data. To assess the impact of different analysis procedures on the morphology, detection, and lateralization of auditory responses in fNIRS. Specifically, whether averaging or GLM-based analyses generate different experimental conclusions, when applied to a block-protocol design. The impact of parameter selection of GLMs on detecting auditory-evoked responses was also quantified. 17 listeners were exposed to three commonly employed auditory stimuli: noise, speech, and silence. A block design was employed, comprising sounds of 5-s duration, and 10–20 s silent intervals. Both analysis procedures generated similar response morphologies and litude estimates, and both also indicated responses to speech to be significantly greater than to noise and silence. Neither approach indicated a significant effect of brain hemisphere on responses to speech. Methods to correct for systemic hemodynamic responses using short channels improved detection at the in idual level. Consistent with theoretical considerations, simulations, and other experimental domains, GLM and averaging analyses generate the same group-level experimental conclusions. We release this dataset publicly for use in future development and optimization of algorithms.
Publisher: Cold Spring Harbor Laboratory
Date: 22-09-2017
DOI: 10.1101/192070
Abstract: Speech is an ecologically essential signal whose processing begins in the subcortical nuclei of the auditory brainstem, but there are few experimental options for studying these early responses under natural conditions. While encoding of continuous natural speech has been successfully probed in the cortex with neurophysiological tools such as electro- and magnetoencephalography, the rapidity of subcortical response components combined with unfavorable signal to noise ratios has prevented application of those methods to the brainstem. Instead, experiments have used thousands of repetitions of simple stimuli such as clicks, tonebursts, or brief spoken syllables, with deviations from those paradigms leading to ambiguity in the neural origins of measured responses. In this study we developed and tested a new way to measure the auditory brainstem response to ongoing, naturally uttered speech. We found a high degree of morphological similarity between the speech-evoked auditory brainstem responses (ABR) and the standard click-evoked ABR, notably a preserved wave V, the most prominent voltage peak in the standard click-evoked ABR. Because this method yields distinct peaks at latencies too short to originate from the cortex, the responses measured can be unambiguously determined to be subcortical in origin. The use of naturally uttered speech to evoke the ABR allows the design of engaging behavioral tasks, facilitating new investigations of the effects of cognitive processes like language processing and attention on brainstem processing. Speech processing is usually studied in the cortex, but it starts in the auditory brainstem. However, a paradigm for studying brainstem processing of continuous natural speech in human listeners has been elusive due to practical limitations. Here we adapt methods that have been employed for studying cortical activity to the auditory brainstem. We measure the response to continuous natural speech and show that it is highly similar to the click-evoked response. The method also allows simultaneous investigation of cortical activity with no added recording time. This discovery paves the way for studies of speech processing in the human brainstem, including its interactions with higher order cognitive processes originating in the cortex.
Publisher: IOP Publishing
Date: 14-07-2015
Publisher: IEEE
Date: 05-2011
Publisher: Wissenschaftliche Verlagsgesellschaft mbH
Date: 09-2018
DOI: 10.3813/AAA.919224
Publisher: Acoustical Society of America (ASA)
Date: 04-2017
DOI: 10.1121/1.4979340
Abstract: Successful speech communication often requires selective attention to a target stream amidst competing sounds, as well as the ability to switch attention among multiple interlocutors. However, auditory attention switching negatively affects both target detection accuracy and reaction time, suggesting that attention switches carry a cognitive cost. Pupillometry is one method of assessing mental effort or cognitive load. Two experiments were conducted to determine whether the effort associated with attention switches is detectable in the pupillary response. In both experiments, pupil dilation, target detection sensitivity, and reaction time were measured the task required listeners to either maintain or switch attention between two concurrent speech streams. Secondary manipulations explored whether switch-related effort would increase when auditory streaming was harder. In experiment 1, spatially distinct stimuli were degraded by simulating reverberation (compromising across-time streaming cues), and target-masker talker gender match was also varied. In experiment 2, diotic streams separable by talker voice quality and pitch were degraded by noise vocoding, and the time alloted for mid-trial attention switching was varied. All trial manipulations had some effect on target detection sensitivity and/or reaction time however, only the attention-switching manipulation affected the pupillary response: greater dilation was observed in trials requiring switching attention between talkers.
Publisher: Frontiers Media SA
Date: 2013
Publisher: Acoustical Society of America (ASA)
Date: 2023
DOI: 10.1121/10.0016832
Abstract: The increasing use of remote platforms for auditory research necessitates more in-depth evaluation of assessment protocols, especially when working with children. This work investigates the influence of the presence of a moderator on remote audiovisual speech perception studies, by assessing how moderation impacts children's understanding and performance of the psychophysical tasks as well as their attention on these tasks. In sum, moderated and unmoderated methods can reliably assess audiovisual speech perception benefits. However, regardless of similar error patterns between both studies, unmoderated online studies with children are prone to more general attention lapses as suggested by higher overall error rates.
Publisher: Frontiers Media SA
Date: 2014
Publisher: Elsevier BV
Date: 2013
Publisher: Acoustical Society of America (ASA)
Date: 07-2015
DOI: 10.1121/1.4922328
Abstract: Whether crossing a busy intersection or attending a large dinner party, listeners sometimes need to attend to multiple spatially distributed sound sources or streams concurrently. How they achieve this is not clear—some studies suggest that listeners cannot truly simultaneously attend to separate streams, but instead combine attention switching with short-term memory to achieve something resembling ided attention. This paper presents two oddball detection experiments designed to investigate whether directing attention to phonetic versus semantic properties of the attended speech impacts listeners' ability to ide their auditory attention across spatial locations. Each experiment uses four spatially distinct streams of monosyllabic words, variation in cue type (providing phonetic or semantic information), and requiring attention to one or two locations. A rapid button-press response paradigm is employed to minimize the role of short-term memory in performing the task. Results show that differences in the spatial configuration of attended and unattended streams interact with linguistic properties of the speech streams to impact performance. Additionally, listeners may leverage phonetic information to make oddball detection judgments even when oddballs are semantically defined. Both of these effects appear to be mediated by the overall complexity of the acoustic scene.
Publisher: Acoustical Society of America (ASA)
Date: 11-07-2013
DOI: 10.1121/1.4812439
Abstract: The ability to consciously switch attention between speakers of interest is necessary for communication in many environments, especially when multiple talkers speak simultaneously. Segregating sounds of interest from the background, which is necessary for selective attention, depends on stimulus acoustics such as differences in spectrotemporal properties of the target and masker. However, the relationship between top-down attention control and bottom-up stimulus segregation is not well understood. Here, two experiments were conducted to examine the time necessary for listeners to switch auditory attention, and how the ability to switch attention relates to the pitch separation cue available for bottom-up stream segregation.
Publisher: Springer Science and Business Media LLC
Date: 23-01-2008
Publisher: Acoustical Society of America (ASA)
Date: 10-10-2012
DOI: 10.1121/1.4757696
Abstract: Listeners are good at attending to one auditory stream in a crowded environment. However, is there an upper limit of streams present in an auditory scene at which this selective attention breaks down? Here, participants were asked to attend one stream of spoken letters amidst other letter streams. In half of the trials, an initial primer was played, cueing subjects to the sound configuration. Results indicate that performance increases with token repetitions. Priming provided a performance benefit, suggesting that stream selection, not formation, is the bottleneck associated with attention in an overcrowded scene. Results' implications for brain-computer interfaces are discussed.
Publisher: Oxford University Press (OUP)
Date: 03-06-2011
Publisher: ASA
Date: 2013
DOI: 10.1121/1.4799815
Publisher: Society for Neuroscience
Date: 26-09-2012
DOI: 10.1523/JNEUROSCI.2495-12.2012
Abstract: In the “flash-beep illusion,” a single light flash is perceived as multiple flashes when presented in close temporal proximity to multiple auditory beeps. Accounts of this illusion argue that temporal auditory information interferes with visual information because temporal acuity is better in audition than vision. However, it may also be that whenever there are multiple sensory inputs, the interference caused by a to-be-ignored stimulus on an attended stimulus depends on the likelihood that the stimuli are perceived as coming from a single distal source. Here we explore, in human observers, perceptual interactions between competing auditory and visual inputs while varying spatial proximity, which affects object formation. When two spatially separated streams are presented in the same (visual or auditory) modality, temporal judgments about a target stream from one direction are biased by the content of the competing distractor stream. Cross-modally, auditory streams from both target and distractor directions bias the perceived number of events in a target visual stream however, importantly, the auditory stream from the target direction influences visual judgments more than does the auditory stream from the opposite hemifield. As in the original flash-beep illusion, visual streams weakly influence auditory judgments, regardless of spatial proximity. We also find that perceptual interference in the flash-beep illusion is similar to within-modality interference from a competing same-modality stream. Results reveal imperfect and obligatory within- and across-modality integration of information, and hint that the strength of these interactions depends on object binding.
Publisher: Society for Neuroscience
Date: 2018
DOI: 10.1523/ENEURO.0441-17.2018
Abstract: Speech is an ecologically essential signal, whose processing crucially involves the subcortical nuclei of the auditory brainstem, but there are few experimental options for studying these early responses in human listeners under natural conditions. While encoding of continuous natural speech has been successfully probed in the cortex with neurophysiological tools such as electroencephalography (EEG) and magnetoencephalography, the rapidity of subcortical response components combined with unfavorable signal-to-noise ratios signal-to-noise ratio has prevented application of those methods to the brainstem. Instead, experiments have used thousands of repetitions of simple stimuli such as clicks, tone-bursts, or brief spoken syllables, with deviations from those paradigms leading to ambiguity in the neural origins of measured responses. In this study we developed and tested a new way to measure the auditory brainstem response (ABR) to ongoing, naturally uttered speech, using EEG to record from human listeners. We found a high degree of morphological similarity between the speech-derived ABRs and the standard click-evoked ABR, in particular, a preserved Wave V, the most prominent voltage peak in the standard click-evoked ABR. Because this method yields distinct peaks that recapitulate the canonical ABR, at latencies too short to originate from the cortex, the responses measured can be unambiguously determined to be subcortical in origin. The use of naturally uttered speech to measure the ABR allows the design of engaging behavioral tasks, facilitating new investigations of the potential effects of cognitive processes like language and attention on brainstem processing.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2017
Publisher: Public Library of Science (PLoS)
Date: 12-09-2013
Publisher: Frontiers Media SA
Date: 20-10-2014
Publisher: IOP Publishing
Date: 13-09-2016
DOI: 10.1088/1741-2560/13/5/056017
Abstract: Brain-computer interface (BCI) technology allows users to generate actions based solely on their brain signals. However, current non-invasive BCIs generally classify brain activity recorded from surface electroencephalography (EEG) electrodes, which can hinder the application of findings from modern neuroscience research. In this study, we use source imaging-a neuroimaging technique that projects EEG signals onto the surface of the brain-in a BCI classification framework. This allowed us to incorporate prior research from functional neuroimaging to target activity from a cortical region involved in auditory attention. Classifiers trained to detect attention switches performed better with source imaging projections than with EEG sensor signals. Within source imaging, including subject-specific anatomical MRI information (instead of using a generic head model) further improved classification performance. This source-based strategy also reduced accuracy variability across three dimensionality reduction techniques-a major design choice in most BCIs. Our work shows that source imaging provides clear quantitative and qualitative advantages to BCIs and highlights the value of incorporating modern neuroscience knowledge and methods into BCI systems.
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 03-2014
Publisher: MyJove Corporation
Date: 24-10-2012
DOI: 10.3791/4262
Publisher: IEEE
Date: 07-2013
Location: United States of America
Start Date: 2012
End Date: 2014
Funder: Air Force Office of Scientific Research
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