New paper in Neuroimage
29th June 2019
Our new paper—Variational representational similarity analysis—is now available online at Neuroimage. This paper introduces variational RSA, a new multivariate approach.
Functional neuroimaging data are usually multivariate—for example, comprising measurements of brain activity at multiple (MRI) voxels or (MEG/EEG/ECoG) channels. Representational similarity analysis (RSA) is often used to quantify the similarity of multivariate activity between experimental conditions. Unlike classic RSA approaches, this paper describes a method for using standard variational inference procedures to quantify the contributions of particular patterns to the data. This enables us to use Parameteric Empirical Bayes to test for consistent effects across participants, and Bayesian Model Comparison to test hypotheses about condition-specific effects. Happily, this scheme allows one to test for mixtures of hypotheses using Bayesian Model Comparison.
You can read the paper online here:
Friston, K. J., Diedrichsen, J., Holmes, E., & Zeidman, P. (2019). Variational representational similarity analysis. Neuroimage
19th June 2019
I’m on my way to the University of Manchester to give a talk. I’m looking forward to presenting some new unpublished data, and catching up with colleagues.
18th June 2019
Tomorrow, I’ll be giving a talk at the Brain Meeting at the Wellcome Centre for Human Neuroimaging. It’s been great to look back over the years and bring together my current and past research—and appreciate the parallels between independent lines of research at different stages of my career.
11th February 2019
I’m currently at the ARO mid-winter meeting in Baltimore, which is a great meeting as usual! I enjoyed the symposium this afternoon on Hearing in Aging, featuring talks by two of my previous lab-mates (at different times)—Adele Goman and Björn Herrmann. Tomorrow, I’ll be co-chairing the Speech Perception session, which looks like it should be a really interesting session. At 2:45pm tomorrow, I’ll be talking about central and peripheral contributions to speech-in-noise variability among people with ‘normal’ hearing. Many thanks to Guarantors of Brain for funding my travel.
Speech in Noise Conference
11th January 2019
The annual Speech in Noise (SpiN) meeting seems to grow every year! Thanks to Sarah Verhulst for organising such an interesting meeting and for introducing us to the lovely (albeit a little rainy) city of Ghent!
Quentin Summerfield Festschrift
19th December 2018
Today marks 4 years since my PhD viva. It also happens to be the day that we’ll meet to celebrate the career of my PhD supervisor: Professor Quentin Summerfield. I’m grateful to have had such a wonderful PhD supervisor, who is renowned for applied research that has influenced health policy, improving the lives of people with hearing loss. Today, I’ll present some of the work we did together, and explain how it’s shaped my current thinking and research interests.
Upcoming talk at UCL Speech Sciences Forum
5th December 2018
Tomorrow, I’ll be giving a talk at the UCL Speech Sciences Forum. It’ll be held at Chandler House at 4pm—please feel free to come along. I’ll be talking about how cognition affects speech perception in people with normal and impaired hearing.
Two Different Ways Familiar Voice Information Can Be Used
29th November 2018
The Canadian Audiologist recently published our article, which summarises some of our key findings on familiar voices. Preparing this also reminded me about all the related work we’ve done on this topic, which should be available in the coming year.
You can find the article here:
Johnsrude, I., Holmes, E., & Deeks, J. (2018). Two Different Ways Familiar Voice Information Can Be Used. Canadian Audiologist, 5(6).
22nd November 2018
I’m very happy to visit Aston University today to talk about my research. I’ll present work demonstrating that listeners with moderate hearing loss have impaired selective attention, reasons why speech-in-noise perception varies substantially among people with ‘normal’ hearing, and how we can utilise knowledge about cognition to improve speech intelligibility.
Attention to Sound Meeting
14th November 2018
This Royal Society meeting was held at Chicheley Hall—a lovely location in the Buckinghamshire countryside. Most of all, I most enjoyed the relaxed discussion sessions, in which we debated topics related to auditory attention. Such an amazing programme of talks by several of my auditory heroes.
1st November 2018
I’m on my way to San Diego for my first Society for Neuroscience (SfN) meeting! I’ve been wanting to go to this conference for a while and am very grateful for the SfN Trainee Development award that has enabled me to attend this year. I’m also looking forward to the satellite meeting tomorrow on Advanced Perspectives in Auditory Neuroscience (APAN). The programs are available through the following links:
- SfN: http://www.sfn.org/Meetings/Neuroscience-2018/Sessions-and-Events
- APAN: https://www.med.upenn.edu/apan/assets/user-content/documents/apan2018/APAN_2018_talks_abstracts.pdf
1st October 2018
The following are press releases for our new Psych Science paper on voice familiarity:
- APS: https://www.psychologicalscience.org/news/releases/familiar-voices.html
- Western BrainsCAN: https://mediarelations.uwo.ca/2018/10/01/familiar-someones-voice-help-us-understand-theyre-saying/
BSA Basic Auditory Science Meeting
2nd September 2018
I’m on my way to The BSA Basic Auditory Science Meeting 2018 in Newcastle. This is my first BSA meeting since I returned to the UK. I’m looking forward to catching up with old colleagues and presenting a talk on my new work: ‘Normal’ hearing thresholds and figure-ground perception explain significant variability in speech-in-noise performance.
Familiar voices are more intelligible, even if they are not recognized as familiar
16th August 2018
Our paper in Psych Science is now available online! In this experiment, we were interested in why speech is more intelligible when it is spoken by familiar than unfamiliar people (see Johnsrude et al., 2013). In other words, what characteristics of someone’s voice do we rely on to better understand speech spoken by familiar people? We also asked whether these characteristics the same ones as those we use to recognise someone from their voice (for example, recognising that the person speaking to you on the phone is your mother).
We recruited pairs of friends who had known each other for longer than 6 months. Each participant heard sentences spoken by their friend and sentences spoken by the friends of other participants, who they did not know. We manipulated the recorded sentences, to simulate changes in vocal tract length (which determines the formants of speech) and/or voice pitch (which are determined by the frequencies). Large changes in voice pitch reduced participants’ ability to recognise their friend’s voice and reduced the intelligibility of familiar than unfamiliar voices, but did not completely eliminate the ability to perform either task (i.e., participants could still recognise the pitch-manipulated voice as familiar and they gained a small intelligibility benefit from that voice). By contrast, large changes in vocal tract length reduced the intelligibility of familiar voices, but completely eliminated the ability to recognise a friend’s voice as familiar. We found a significant interaction between voice manipulation condition (i.e., manipulations to voice pitch or vocal tract length) and task (i.e., recognition or intelligibility task), confirming that acoustic properties of a voice contribute differently to the ability to recognise a familiar person from their voice and the ability to understand the words that a familiar person is speaking. Moreover, most participants who were unable to recognise their friend’s voice as familiar when it was manipulated still received a speech intelligibility benefit from this same voice (i.e., participants were better at reporting words in the manipulated familiar voice than the same words in an unfamilar voice, who the participant had never met). These results demonstrate an interesting dissociation between the ability to recognise someone from their voice and the ability to understand the words that someone is speaking, suggesting that we use familiar-voice information differently in different contexts.
If you’d like to read more about this research, here’s a link to the paper:
Holmes, E., Domingo, Y., & Johnsrude (2018). Familiar voices are more intelligible, even if they are not recognized as familiar. Psychological Science. https://doi.org/10.1177/ 0956797618779083 [Epub ahead of print]
22nd May 2018
I’m on my way home from the 2nd Cambridge Representational Similarity Analysis and Advanced Computational Methods Workshop and it’s been a fantastic two days. Alex Wooglar gave a great talk on teasing apart hypotheses of attention using RSA for MEG, and she showed a novel Granger causality approach to RSA. I also enjoyed Cai Wingfield’s talk, where he described some studies combining automatic speech recognition approaches with M/EEG data recorded while participants listened to spoken words (for more information, see their paper). Johan Carlin’s talk was also very insightful, showing how differences in mean activity can influence the structure of multi-dimensional scaling output in surprising ways. Some interesting discussion followed about whether we can and should try to tease apart differences in ‘patterns’ of activity from differences in mean activity.
15th May 2018
I’ll be heading up to Newcastle tomorrow for a joint meeting of the Phonetics & Phonology and Auditory groups. I’m looking forward to talking about my new experiment (“Developing auditory figure ground tasks to better explain variation in speech-in-noise performance”) and to lots of interesting discussions about speech and language.
New paper accepted in Psych Science
5th May 2018
One of our papers on voice familiarity has recently been accepted in Psychological Science. In this paper, we show that familiar-voice information is used differently in different contexts—depending on whether the goal is to recognise someone from their voice or to understand the words that person is saying. I’ll post more details here when the paper goes live…
Preparing attention improves speech intelligibility
27th April 2018
Our new paper in Attention, Perception, & Psychophysics is now available online. In this paper, we show that preparing attention for an upcoming talker improves speech intelligibility, with greater benefits when we have longer time to prepare. This finding supports a mechanism by which partially preparing attention improves performance, but performance does not peak until we are in a fully prepared state.
In this experiment, we presented an visual cue that instructed participants to attend to a talker who was at a target location (left/right) or who was of a target gender (male/female). We varied the cue-target interval between the time at which the visual cue was revealed and the time at which the target talker and two other distracting talkers started to speak. Response times for reporting words spoken by the target talker became significantly shorter as the duration of the cue-target interval increased from 0 to 2 seconds. Most previous experiments investigating endogenous visual and/or auditory attention have not tested cue-target intervals as long as 2 seconds, yet we found a significant improvement in performance between cue-target intervals of 1 and 2 seconds. Thus, our findings suggest that future experiments should include intervals up to and beyond 2 seconds to maximise benefits of advance cueing on task performance.
If you want to read more about the experiment, here’s the paper:
Holmes, E., Kitterick, P. T. & Summerfield, A. Q. (2018). Cueing listeners to attend to a target talker progressively improves word report as the duration of the cue-target interval lengthens to 2000 ms. Attention, Perception, & Psychophysics. [Epub ahead of print]
Talk at Royal Holloway this week
19th February 2018
On Wednesday (21st February), I’ll be visiting Royal Holloway and will be giving a talk on our recent work on familiar voices. If you’re around, come along to find out (1) how being familiar with someone’s voice helps you to better understand what they’re saying, (2) how long it takes to become familiar with a new voice, and (3) how patterns of brain activity elicited by a voice depend on its familiarity.
Semantic context reduces listening effort for hearing-aid users
17th February 2018
Our new paper has just been published online in the International Journal of Audiology. The paper arose from a collaboration with the National Centre of Audiology at Western University, with Susan Scollie and Paula Folkeard.
People with hearing impairment are known to find listening to speech particularly difficult and effortful when reverberant noise is present. Here, we measured speech intelligibility and subjective ratings of listening effort when people with hearing impairment listened to speech in the presence of reverberant cafeteria noise. When participants listened with a hearing-aid setting designed for reverberant environments, they reported more words correctly and reported lower listening effort than when they used a standard omnidirectional hearing-aid setting. Participants received a greater improvement in speech inteligibility, and similar reduction in listening effort, when they listened to sentences preceeded by a same-topic than different-topic sentence.
Semantic context and hearing-aid setting had additive effects on speech intelligibility and listening effort, demonstrating that the benefit of semantic context can extend above and beyond the improvement gained from changing hearing-aid settings. These results highlight the enormous potential of cognitive factors for improving speech intelligibility and reducing perceived listening effort in noisy acoustic environments.
You can read the paper here:
Holmes, E., Folkeard, P., Johnsrude, I. S., & Scollie, S. (2018). Semantic context reduces sentence-by-sentence listening effort for listeners with hearing impairment. International Journal of Audiology.
8th February 2018
I’m on my way to the 41st ARO MidWinter meeting and half the plane is filled with auditory researchers! Alex Billig and I organised a Young Investigator Symposium on ‘Non-acoustic influences on speech perception in normal and impaired hearing’, which will take place on Tuesday. The symposium highlights the wide variety of factors that influence speech perception and will feature talks by Tessa Bent, Ross Maddox, Alex Billig, Elin Roverud, Stefanie Kuchinsky, Pranesh Bhargava, Malte Wöstmann, and myself. You can find the abstract book here: ARO 2018 MidWinter Meeting Abstracts
Two new papers accepted
18th January 2018
A great start to the new year—2 papers accepted within the past week! Watch this space for details…
Moved to UCL
2nd January 2018
Recently, I made the transatlantic move from London Ontario to London England to start a new position at UCL. I’ll be based at the Wellcome Trust Centre for Neuroimaging (known locally as the FIL) at 12 Queen Square. I’m looking forward to making use of the 3 fMRI scanners and the MEG scanner here.
14th November 2017
I’ve just got back from the 2017 Annual Meeting of the Psychonomic Society. It was my first time at Psychonomics and I presented some of my new work on familiar voices. I’m very grateful to have received a Women in Cognitive Science Travel and Networking Award to attend.
New paper out in JARO
5th October 2017
Our new paper has just been published online in JARO. The paper describes two experiments that investigated whether envelope following responses (EFRs) are affected by attention.
We found that EFRs were modulated by frequency-specific attention when we used stimuli with lower amplitude modulation rates (93–109 Hz), but not when we used stimuli with higher amplitude modulation rates (217–233 Hz). The results demonstrate that amplitude modulation rate can dramatically affect the conclusions of EFR studies—implying that different neuronal populations contribute to EFRs at these lower and higher rates.
Auditory Cortex meeting
8th September 2017
Tomorrow, I’ll be flying out to the International Conference on Auditory Cortex. I’m looking forward to presenting my latest fMRI work on ‘How are familiar voices represented in auditory cortex?’, catching up with colleagues, and enjoying the beautiful scenery in Banff!
Speech recording videos
21st August 2017
Yesterday, I shared some code that I wrote to generate videos, which I have used to standardise speech recordings. When making sentence recordings, these videos have been helpful in ensuring that word onsets are aligned between different talkers, who might otherwise speak at very different speeds. The code is quite flexible and has been used to generate sentence videos in 4 different languages for 10 research projects in the lab. You can find the code on my Github profile.
4th August 2017
I’ve recently started using Github and have created a profile to share some of my code. For example, I’ve made available the code I wrote to calculate Phase Coherence and an analysis method I developed for estimating the dissimilarity in source locations between two conditions (termed ‘Source Dissimilarity Index‘). I have programmed both of these analyses in MATLAB and Python.
You can view my Github profile here. I would be interested to hear from you if you’re using the code or have found it useful.
New paper on attention in hearing-impaired children
22nd May 2017
Another paper from my PhD has recently been published. The paper provides evidence that children with sensorineural hearing loss have a reduced ability to direct selective attention to a talker of interest compared to children of a similar age who have normal hearing.
People with hearing impairment often experience particular difficulty when listening to speech in the presence of other competing speech. Since auditory attention is crucial for separating simultaneous speech, we tested the hypothesis that auditory attention is atypical in hearing-impaired children.
Participants were cued to attend to a talker (defined by their location or gender) who spoke in a mixture of three talkers. To isolate attentional processing from peripheral acoustic processing, we measured electro-encephalography (EEG) when participants prepared their attention for an upcoming talker. Hearing-impaired children showed a reduced ability to prepare spatial attention compared to normally-hearing children. Preparatory EEG activity was not restored when the hearing-impaired children listened using their acoustic hearing aids. These findings demonstrate that sensorineural hearing loss has consequences for central processing, providing a shift in thinking from the traditional view of hearing loss as purely a peripheral phenomenon.
The paper can be accessed here:
Holmes, E., Kitterick, P. T. & Summerfield, A. Q. (2017). Peripheral hearing loss reduces the ability of children to direct selective attention during multi-talker listening. Hearing Research, 350, 160–172. doi:10.1016/j.heares.2017.05.005
Pint of Science
11th May 2017
On Monday, I’ll be giving a talk at the London Ontario Pint of Science festival. The Pint of Science festival takes place every year at locations all around the world, but this is the first year that the festival’s being held in London Ontario. The idea is to convey the latest scientific research to the public in an interesting and accessible way. The festival comprises a series of talks and discussions, which are held in local pubs. You can attend any of the events for free by registering on the website: https://www.pintofscience.ca/london-2017. My talk, “Can you hear me?”, is part of the Beautiful Minds session on May 15th.
Paper accepted in The Journal of Neuroscience
21st April 2017
Björn Herrmann and I recently received notification that our paper—entitled “Revisiting the contribution of auditory cortex to frequency-following responses”—has been accepted for publication in The Journal of Neuroscience. The paper highlights accumulating evidence that auditory cortex contributes to FFRs at frequencies traditionally thought to predominantly reflect brainstem sources. This idea is becoming increasingly important, because researchers have often assumed that differences in FFRs at these frequencies must reflect differences in brainstem processing. Nevertheless, the relative magnitudes of cortical and brainstem contributions to FFRs at different frequencies remain unclear. In the paper, we suggest avenues for future research that could help to improve understanding of the neural generators of FFRs and of brainstem processing.
Holmes, E., & Herrmann, B. (2017). Revisiting the contribution of auditory cortex to frequency-following responses. The Journal of Neuroscience, 37(21), 5218–5220.
Two talks at ARO meeting
16th February 2017
The Association for Research in Otolaryngology (ARO) Mid-Winter meeting was held in Baltimore MD this year. As usual, the conference was packed with interesting research and it was difficult to see everything in the time available! Nevertheless, I always enjoy ARO for finding out about the latest research and having great discussions.
This year, I gave two talks and co-moderated a podium session, so the conference was even busier than usual! The Speech Perception session that I was moderating—on the first afternoon of the conference—included lots of great talks. In the same session, I talked about some of my recent work on the voice cues that enable us to understand and recognise speech spoken by familiar talkers (such as a good friend or partner).
A few days later, I gave a talk in the Brainstem session. I presented the results of my recent experiment showing that attending to sounds of particular frequencies affects envelope following responses (EFRs) at lower (93–109 Hz) but not higher (217–233 Hz) frequencies. There was an excellent turnout and I got lots of great feedback.
Collaborative Research Funding
3rd February 2017
I’ve recently had the opportunity to be involved in the funding process for the Brain and Mind Institute Postdoctoral Collaborative Research Grants. These grants are a new initiative by the Brain and Mind Institute to promote collaboration between different labs and give postdocs the opportunity to carry out independent research projects. I’ve been fortunate enough to see the funding process through from start to finish and gain insight into the entire process. I formed a committee to review the applications and was also involved in reviewing the applications myself. Overall, it was a very interesting and rewarding experience.
Listen up: Our brains prepare to ‘tune in’ to a voice of interest
6th December 2016
A lay summary of my 2016 Hearing Research paper was published yesterday on the Atlas of Science website, which aims to promote the dissemination of recent scientific papers to a broader audience. All of the articles are written by authors. The website includes lots of other interesting research summaries on a variety of topics.
Talk at FFR Workshop
20th May 2016
On Wednesday 18th May, I traveled to Boston MA, for the 2nd Frequency Following Response (FFR) workshop. My talk, entitled “Effect of attention on envelope following responses”, was on the second day of the workshop. There was an exciting program of talks and lots of great opportunities for discussion!
New paper published in Hearing Research
10th May 2016
A paper from my PhD has been accepted in Hearing Research and is now available online. The paper reports three EEG experiments investigating the time course of preparatory attention, when adults (18-27 years) and children (7-13 years) were cued to attend to one of two talkers during multi-talker listening.
Adults and children were able to use visual instructive cues for spatial location (left/right) and gender (male/female) to select words spoken by the target talker. Both adults and children showed preparatory EEG activity very soon (< 50 ms) after they were cued to the spatial location of a target talker. Adults, but not children, showed preparatory EEG activity when they were cued to gender. Although, preparatory EEG activity for gender was only apparent when the cue for gender predicted the specific identity of the male or female talkers and was not present when the gender cue could refer to one of three different male or female talkers.
Overall, the results provide converging evidence that listeners evoke consistent preparatory brain activity for selecting a talker by their location (regardless of their gender or identity), but not by their gender alone.
The paper can be accessed here:
Holmes, E., Kitterick, P.T., Summerfield, A.Q. (2016). EEG activity evoked in preparation for multi-talker listening by adults and children. Hearing Research, 336, 83–100. doi:10.1016/j.heares.2016.04.007
Does instrument familiarity affect the ability to separate multiple competing melodies?
9th May 2016
One of my ongoing research projects was featured in a recent newsletter of the Music Learning Across the Lifespan (MLAL) group of Western University. The project is a collaboration between researchers at the Brain and Mind Institute and at the Don Wright Faculty of Music.
We were interested in whether musical instrument learning affects the perception of melodies played by a trained instrument, compared to instruments on which participants had never been trained. Specifically, we aimed to investigate whether familiarity with an instrument helps people to perceptually separate (or “pull apart”) melodies played simultaneously by different instruments, if one of the instruments is familiar.
You can read about this project and other exciting projects of the MLAL group online in the Spring 2016 newsletter.
The MLAL group has been very successful in promoting collaboration between different departments at Western University. The group has funded collaborative pilot studies and I was very grateful to recieve funding as a Prinicipal Investigator to carry out a project in collaboration with the Don Wright Faculty of Music at the end of last year. The project will investigate whether musical instrument learning affects brain responses in a timbre-specific manner.
Three Minute Research Competition
28th April 2016
Today, I entered the Three Minute Research competition for postdocs at Western University. The competition was modeled on the increasingly popular Three Minute Thesis competition, which was first held at the University of Queensland in 2008. The aim of the computition is to convey your research in less than three minutes and engage an audience of non-specialists—with only one PowerPoint slide allowed! A panel of judges evaluated our presentations and I was awarded a prize, which includes funding for travel to a future conference. Overall, the competition provided an interesting opportunity to think in more depth about the broader implications of my research and was a great exercise in science communication. I recommend that everyone has a go at this in the future!