Research Interests
Auditory neuroscience
Cortical processing of natural sounds
Cortical bases of auditory attention
Speech processing
Psychoacoustics & auditory modelling
Contact Details
Affiliations
Technical University of Denmark
Employments
2016 – Present | Senior Researcher, DRCMR |
2016 – Present | Senior Researcher, Hearing Systems group, Technical University of Denmark, DTU |
2013 – 2016 | Postdoc at CHeSS: Oticon Centre of Excellence for Speech and Hearing Sciences (DRCMR & Technical University of Denmark, DTU) |
2012 – 2013 | Research assistant, DRCMR |
2011 – 1212 | Research assistant, University of Copenhagen |
2010 – 2010 | Visiting researcher, IRCAM, Paris |
2005 – 2006 | Research Assistant, Unit for Cognitive Neuroscience, University of Copenhagen |
Education
2011 | PhD, Cognitive Psychology of Music, University of Copenhagen |
2007 | MA, Music & Cognitive Psychology, University of Copenhagen |
2000 | BA, Music & Philosophy, University of Aarhus |
Publications
Hjortkjær J, Wong DDE, Catania A, Märcher-Rørsted J, Ceolini E, Fuglsang SA, Kiselev I, Di Liberto G, Liu S, Dau T, Slaney M and De Cheveigné A (2025), 'Real-time control of a hearing instrument with EEG-based attention decoding', Journal of Neural Engineering, 22(1), doi:10.1088/1741-2552/ad867c
Fuglsang SA, Madsen KH, Puonti O, Siebner HR and Hjortkjær J (2024), 'Exploring an EM-algorithm for banded regression in computational neuroscience', Imaging Neuroscience, 2:1-19, doi:10.1162/imag_a_00155
Pedersen NF, Dau T, Hansen LK and Hjortkjær J (2022), 'Modulation transfer functions for audiovisual speech', PLOS Computational Biology, 18(7):1-23, doi:10.1371/journal.pcbi.1010273
Fuglsang SA, Madsen KH, Puonti O, Hjortkjær J and Siebner HR (2021), 'Mapping cortico-subcortical sensitivity to 4 Hz amplitude modulation depth in human auditory system with functional MRI', NeuroImage, 246:1-12, doi:10.1016/j.neuroimage.2021.118745
Märcher-Rørsted J, Encina-Llamas G, Dau T, Liberman MC, Wu P and Hjortkjær J (2021), 'Age-related reduction in frequency-following responses as a potential marker of cochlear neural degeneration', Hearing Research, 414:1-11, doi:10.1016/j.heares.2021.108411
Scheuregger O, Hjortkjær J and Dau T (2021), 'Identification and Discrimination of Sound Textures in Hearing-Impaired and Older Listeners', Trends in hearing, 25:1-14, doi:10.1177/23312165211065608
Bachmann FL, MacDonald EN and Hjortkjær J (2021), 'Neural Measures of Pitch Processing in EEG Responses to Running Speech', Frontiers in Neuroscience, 15:1-11, doi:10.3389/fnins.2021.738408
De Cheveigné A, Slaney M, Fuglsang S and Hjortkjaer J (2021), 'Auditory stimulus-response modeling with a Match-Mismatch task', Journal of Neural Engineering, 18(4):1-16, doi:10.1088/1741-2552/abf771
Ceolini E, Hjortkjær J, Wong DDE, O'Sullivan J, Raghavan VS, Herrero J, Mehta AD, Liu S and Mesgarani N (2020), 'Brain-informed speech separation (BISS) for enhancement of target speaker in multitalker speech perception', NeuroImage, 223:1-12, doi:10.1016/j.neuroimage.2020.117282
Fuglsang SA, Märcher-Rørsted J, Dau T and Hjortkjær J (2020), 'Effects of sensorineural hearing loss on cortical synchronization to competing speech during selective attention', Neuroscience Journal, 40(12):2562-2572, doi:10.1523/JNEUROSCI.1936-19.2020
Hjortkjaer J, Märcher-Rørsted J, Fuglsang SA and Dau T (2018), 'Cortical oscillations and entrainment in speech processing during working memory load', European Journal of Neuroscience, 51(5):1279-1289, doi:10.1111/ejn.13855
De Cheveigné A, Di Liberto GM, Arzounian D, Wong DDE, Hjortkjær J, Fuglsang S and Parra LC (2018), 'Multiway canonical correlation analysis of brain data', NeuroImage, 186:728-740, doi:10.1016/j.neuroimage.2018.11.026
Wong DDE, Fuglsang SA, Hjortkjær J, Ceolini E, Slaney M and De Cheveigné A (2018), 'A Comparison of Regularization Methods in Forward and Backward Models for Auditory Attention Decoding', Frontiers in Neuroscience, 12(531), doi:10.3389/fnins.2018.00531
De Cheveigné A, Wong D, Di Liberto GM, Hjortkjaer J, Slaney M and Lalor E (2018), 'Decoding the auditory brain with canonical component analysis', NeuroImage, 172:206-216, doi:10.1016/j.neuroimage.2018.01.033
Hjortkjær J, Kassuba T, Madsen KH, Skov M and Siebner HR (2018), 'Task-Modulated Cortical Representations of Natural Sound Source Categories', Cerebral Cortex, 28(1):295-306, doi:10.1093/cercor/bhx263
Bianchi F, Hjortkjær J, Santurette S, Zatorre RJ, Siebner HR and Dau T (2017), 'Subcortical and cortical correlates of pitch discrimination: Evidence for two levels of neuroplasticity in musicians', NeuroImage, 163:398-412, doi:10.1016/j.neuroimage.2017.07.057
Fuglsang SA, Dau T and Hjortkjær J (2017), 'Noise-robust cortical tracking of attended speech in real-world acoustic scenes', NeuroImage, 156:435-444, doi:10.1016/j.neuroimage.2017.04.026
Hjortkjær J and McAdams S (2016), 'Spectral and temporal cues for perception of material and action categories in impacted sound sources', Journal of the Acoustical Society of America, 140(1):409-420, doi:10.1121/1.4955181
Wendt D, Dau T and Hjortkjær J (2016), 'Impact of Background Noise and Sentence Complexity on Processing Demands during Sentence Comprehension', Frontiers in Psychology, 7(MAR), doi:10.3389/fpsyg.2016.00345
Hjortkjær J (2016), 'Sound objects – Auditory objects – Musical objects', Danish Musicology Online, Special Edition:47-56
Wendt D, Dau T and Hjortkjær J (2015), 'Impact of background noise and sentence complexity on cognitive processing effort', Proceedings of ISAAR 2015: : Individual Hearing Loss – Characterization, Modelling, :373-380
Hjortkjær J and Walther-Hansen M (2014), 'Perceptual effects of dynamic range compression in popular music recordings.', Journal of the Audio Engineering Society, 62(1):37-41
Hjortkjær J (2014), unknown publication 9120a0d2-988d-481f-9643-6ce3780efba4
staff.html