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Spencer Sterling Kellis

Research Assistant Professor of Neurological Surgery

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Email skellis@usc.edu
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Publications

  • Understanding the human conflict processing network: A review of the literature on direct neural recordings during performance of a modified stroop task Neurosci Res. 2024 Apr 04. . View in PubMed
  • Primary somatosensory cortex organization for engineering artificial somatosensation Neurosci Res. 2024 Jan 24. . View in PubMed
  • Stereotactic Frame-Based Electrode Insertion: The Accuracy of Increasingly Oblique Insertion Angles Turk Neurosurg. 2024; 34(1):128-134. . View in PubMed
  • Neural subspaces of imagined movements in parietal cortex remain stable over several years in humans bioRxiv. 2023 Jul 07. . View in PubMed
  • Neural representations of economic decision variables in human posterior parietal cortex bioRxiv. 2023 May 18. . View in PubMed
  • A review of neurophysiological effects and efficiency of waveform parameters in deep brain stimulation Clin Neurophysiol. 2023 08; 152:93-111. . View in PubMed
  • S1 represents multisensory contexts and somatotopic locations within and outside the bounds of the cortical homunculus Cell Rep. 2023 04 25; 42(4):112312. . View in PubMed
  • Suppression of cortical electrostimulation artifacts using pre-whitening and null projection J Neural Eng. 2023 09 22; 20(5). . View in PubMed
  • Neuromodulation in Beta-Band Power Between Movement Execution and Inhibition in the Human Hippocampus Neuromodulation. 2022 Feb; 25(2):232-244. . View in PubMed
  • Decoding grasp and speech signals from the cortical grasp circuit in a tetraplegic humanNeuron. 2022 06 01; 110(11):1777-1787. e3. . View in PubMed
  • Theta low-gamma phase amplitude coupling in the human orbitofrontal cortex increases during a conflict-processing task J Neural Eng. 2022 02 16; 19(1). . View in PubMed
  • Exploring Cognition with Brain-Machine Interfaces Annu Rev Psychol. 2022 01 04; 73:131-158. . View in PubMed
  • Baseline hippocampal beta band power is lower in the presence of movement uncertainty J Neural Eng. 2022 07 22; 19(4). . View in PubMed
  • Benchtop and bedside validation of a low-cost programmable cortical stimulator in a testbed for bi-directional brain-computer-interface research Front Neurosci. 2022; 16:1075971. . View in PubMed
  • Amygdaloid theta-band power increases during conflict processing in humans J Clin Neurosci. 2021 Sep; 91:183-192. . View in PubMed
  • Hippocampal and Orbitofrontal Theta Band Coherence Diminishes During Conflict Resolution World Neurosurg. 2021 08; 152:e32-e44. . View in PubMed
  • Mapping of primary somatosensory cortex of the hand area using a high-density electrocorticography grid for closed-loop brain computer interface J Neural Eng. 2021 03 04; 18(3). . View in PubMed
  • Neuropathological effects of chronically implanted, intracortical microelectrodes in a tetraplegic patient J Neural Eng. 2021 07 27; 18(4). . View in PubMed
  • SpikeDeep-classifier: a deep-learning based fully automatic offline spike sorting algorithm J Neural Eng. 2021 02 05; 18(1). . View in PubMed
  • The Neurophysiological Representation of Imagined Somatosensory Percepts in Human Cortex J Neurosci. 2021 03 10; 41(10):2177-2185. . View in PubMed
  • A Phantom Study of the Spatial Precision and Accuracy of Stereotactic Localization Using Computed Tomography Imaging with the Leksell Stereotactic System World Neurosurg. 2020 07; 139:e297-e307. . View in PubMed
  • Thermal Analysis of a Skull Implant in Brain-Computer Interfaces Annu Int Conf IEEE Eng Med Biol Soc. 2020 07; 2020:3066-3069. . View in PubMed
  • A Prototype of a Fully-Implantable Charge-Balanced Artificial Sensory Stimulator for Bi-directional Brain-Computer-Interface (BD-BCI) Annu Int Conf IEEE Eng Med Biol Soc. 2020 07; 2020:3083-3085. . View in PubMed
  • Gamma-band modulation in the human amygdala during reaching movements Neurosurg Focus. 2020 07; 49(1):E4. . View in PubMed
  • Utility and lower limits of frequency detection in surface electrode stimulation for somatosensory brain-computer interface in humans Neurosurg Focus. 2020 02 01; 48(2):E2. . View in PubMed
  • Beta-band power modulation in the human hippocampus during a reaching task J Neural Eng. 2020 06 12; 17(3):036022. . View in PubMed
  • The human primary somatosensory cortex encodes imagined movement in the absence of sensory information Commun Biol. 2020 12 11; 3(1):757. . View in PubMed
  • Comparison of Intraoperative 3-Dimensional Fluoroscopy With Standard Computed Tomography for Stereotactic Frame Registration Oper Neurosurg (Hagerstown). 2020 06 01; 18(6):698-709. . View in PubMed
  • Beta-band modulation in the human hippocampus during a conflict response task J Neural Eng. 2020 11 11; 17(6). . View in PubMed
  • Optimal artifact suppression in simultaneous electrocorticography stimulation and recording for bi-directional brain-computer interface applications J Neural Eng. 2020 04 29; 17(2):026038. . View in PubMed
  • From thought to action: The brain-machine interface in posterior parietal cortex Proc Natl Acad Sci U S A. 2019 Dec 26; 116(52):26274-26279. . View in PubMed
  • Clinical neuroprosthetics: Today and tomorrow J Clin Neurosci. 2019 Oct; 68:13-19. . View in PubMed
  • Directional tuning during reach planning in the supramarginal gyrus using local field potentials J Clin Neurosci. 2019 Jun; 64:214-219. . View in PubMed
  • Technical considerations for generating somatosensation via cortical stimulation in a closed-loop sensory/motor brain-computer interface system in humans J Clin Neurosci. 2019 May; 63:116-121. . View in PubMed
  • Electrocorticographic changes in field potentials following natural somatosensory percepts in humans Exp Brain Res. 2019 May; 237(5):1155-1167. . View in PubMed
  • Brain-Computer Interfaces in Quadriplegic Patients Neurosurg Clin N Am. 2019 Apr; 30(2):275-281. . View in PubMed
  • SpikeDeeptector: a deep-learning based method for detection of neural spiking activity J Neural Eng. 2019 07 23; 16(5):056003. . View in PubMed
  • Functional Frequency Discrimination From Cortical Somatosensory Stimulation in Humans Front Neurosci. 2019; 13:832. . View in PubMed
  • Utilizing Light-field Imaging Technology in Neurosurgery Cureus. 2018 Apr 10; 10(4):e2459. . View in PubMed
  • Proprioceptive and cutaneous sensations in humans elicited by intracortical microstimulation Elife. 2018 04 10; 7. . View in PubMed
  • Engineering Artificial Somatosensation Through Cortical Stimulation in Humans Front Syst Neurosci. 2018; 12:24. . View in PubMed
  • Multivariate regression methods for estimating velocity of ictal discharges from human microelectrode recordings J Neural Eng. 2017 08; 14(4):044001. . View in PubMed
  • Non ictal onset zone: A window to ictal dynamics Epilepsy Behav Case Rep. 2017; 8:123-127. . View in PubMed
  • The ictal wavefront is the spatiotemporal source of discharges during spontaneous human seizures Nat Commun. 2016 Mar 29; 7:11098. . View in PubMed
  • Multi-scale analysis of neural activity in humans: Implications for micro-scale electrocorticography Clin Neurophysiol. 2016 Jan; 127(1):591-601. . View in PubMed
  • Hand Shape Representations in the Human Posterior Parietal Cortex J Neurosci. 2015 Nov 18; 35(46):15466-76. . View in PubMed
  • NeurophysiologyDecoding motor imagery from the posterior parietal cortex of a tetraplegic human. Science. 2015 May 22; 348(6237):906-10. . View in PubMed
  • Parietal neural prosthetic control of a computer cursor in a graphical-user-interface task J Neural Eng. 2014 Dec; 11(6):066014. . View in PubMed
  • A cognitive neuroprosthetic that uses cortical stimulation for somatosensory feedback J Neural Eng. 2014 Oct; 11(5):056024. . View in PubMed
  • Toward more versatile and intuitive cortical brain-machine interfaces Curr Biol. 2014 Sep 22; 24(18):R885-R897. . View in PubMed
  • Potential for unreliable interpretation of EEG recorded with microelectrodes Epilepsia. 2013 Aug; 54(8):1391-401. . View in PubMed
  • Decoding stimulus identity from multi-unit activity and local field potentials along the ventral auditory stream in the awake primate: implications for cortical neural prostheses J Neural Eng. 2013 Feb; 10(1):016010. . View in PubMed
  • Signal distortion from microelectrodes in clinical EEG acquisition systems J Neural Eng. 2012 Oct; 9(5):056007. . View in PubMed
  • Information transfer along the ventral auditory processing stream in the awake macaque Annu Int Conf IEEE Eng Med Biol Soc. 2012; 2012:5178-81. . View in PubMed
  • Decoding hand trajectories from micro-electrocorticography in human patients Annu Int Conf IEEE Eng Med Biol Soc. 2012; 2012:4091-4. . View in PubMed
  • Platinum microwire for subdural electrocorticography over human neocortex: millimeter-scale spatiotemporal dynamics Annu Int Conf IEEE Eng Med Biol Soc. 2011; 2011:4761-5. . View in PubMed
  • Decoding spoken words using local field potentials recorded from the cortical surface J Neural Eng. 2010 Oct; 7(5):056007. . View in PubMed
  • Classification of spoken words using surface local field potentials Annu Int Conf IEEE Eng Med Biol Soc. 2010; 2010:3827-30. . View in PubMed
  • Human neocortical electrical activity recorded on nonpenetrating microwire arrays: applicability for neuroprostheses Neurosurg Focus. 2009 Jul; 27(1):E9. . View in PubMed
  • Multi-scale recordings for neuroprosthetic control of finger movements Annu Int Conf IEEE Eng Med Biol Soc. 2009; 2009:4573-7. . View in PubMed

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