Spencer Sterling Kellis

Title(s)Research Assistant Professor of Neurological Surgery
SchoolKeck School of Medicine of Usc
AddressMCH B-51
Health Sciences Campus
Los Angeles CA 90089
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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Neural subspaces of imagined movements in parietal cortex remain stable over several years in humans. bioRxiv. 2023 Jul 07. Bashford L, Rosenthal I, Kellis S, Bjånes D, Pejsa K, Brunton BW, Andersen RA. PMID: 37461446; PMCID: PMC10350015.
      View in: PubMed   Mentions:
    2. Neural representations of economic decision variables in human posterior parietal cortex. bioRxiv. 2023 May 18. Klaes C, Pilacinski A, Kellis S, Aflalo T, Liu C, Andersen R. PMID: 37293079; PMCID: PMC10245787.
      View in: PubMed   Mentions:
    3. A review of neurophysiological effects and efficiency of waveform parameters in deep brain stimulation. Clin Neurophysiol. 2023 Aug; 152:93-111. Gilbert Z, Mason X, Sebastian R, Tang AM, Martin Del Campo-Vera R, Chen KH, Leonor A, Shao A, Tabarsi E, Chung R, Sundaram S, Kammen A, Cavaleri J, Gogia AS, Heck C, Nune G, Liu CY, Kellis SS, Lee B. PMID: 37208270.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    4. S1 represents multisensory contexts and somatotopic locations within and outside the bounds of the cortical homunculus. Cell Rep. 2023 Mar 30; 42(4):112312. Rosenthal IA, Bashford L, Kellis S, Pejsa K, Lee B, Liu C, Andersen RA. PMID: 37002922.
      View in: PubMed   Mentions:    Fields:    
    5. 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. Sohn WJ, Lim J, Wang PT, Pu H, Malekzadeh-Arasteh O, Shaw SJ, Armacost M, Gong H, Kellis S, Andersen RA, Liu CY, Heydari P, Nenadic Z, Do AH. PMID: 36711153; PMCID: PMC9878125.
      View in: PubMed   Mentions:
    6. Baseline hippocampal beta band power is lower in the presence of movement uncertainty. J Neural Eng. 2022 07 22; 19(4). Gilbert ZD, Martin Del Campo-Vera R, Tang AM, Chen KH, Sebastian R, Shao A, Tabarsi E, Chung RS, Leonor A, Sundaram S, Heck C, Nune G, Liu CY, Kellis S, Lee B. PMID: 35803209; PMCID: PMC9376116.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    7. Decoding grasp and speech signals from the cortical grasp circuit in a tetraplegic human. Neuron. 2022 06 01; 110(11):1777-1787.e3. Wandelt SK, Kellis S, Bjånes DA, Pejsa K, Lee B, Liu C, Andersen RA. PMID: 35364014; PMCID: PMC9186423.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    8. 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). Chen KH, Tang AM, Gilbert ZD, Martin Del Campo-Vera R, Sebastian R, Gogia AS, Sundaram S, Tabarsi E, Lee Y, Lee R, Nune G, Liu CY, Kellis S, Lee B. PMID: 35086075; PMCID: PMC8900540.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    9. Neuromodulation in Beta-Band Power Between Movement Execution and Inhibition in the Human Hippocampus. Neuromodulation. 2022 Feb; 25(2):232-244. Del Campo-Vera RM, Tang AM, Gogia AS, Chen KH, Sebastian R, Gilbert ZD, Nune G, Liu CY, Kellis S, Lee B. PMID: 35125142; PMCID: PMC8727636.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    10. Exploring Cognition with Brain-Machine Interfaces. Annu Rev Psychol. 2022 01 04; 73:131-158. Andersen RA, Aflalo T, Bashford L, Bjånes D, Kellis S. PMID: 34982594.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    11. Neuropathological effects of chronically implanted, intracortical microelectrodes in a tetraplegic patient. J Neural Eng. 2021 07 27; 18(4). Szymanski LJ, Kellis S, Liu CY, Jones KT, Andersen RA, Commins D, Lee B, McCreery DB, Miller CA. PMID: 34314384.
      View in: PubMed   Mentions: 5     Fields:    Translation:HumansAnimals
    12. Amygdaloid theta-band power increases during conflict processing in humans. J Clin Neurosci. 2021 Sep; 91:183-192. Tang AM, Chen KH, Gogia AS, Del Campo-Vera RM, Sebastian R, Gilbert ZD, Lee Y, Nune G, Liu CY, Kellis S, Lee B. PMID: 34373025.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    13. Hippocampal and Orbitofrontal Theta Band Coherence Diminishes During Conflict Resolution. World Neurosurg. 2021 08; 152:e32-e44. Tang AM, Chen KH, Del Campo-Vera RM, Sebastian R, Gogia AS, Nune G, Liu CY, Kellis S, Lee B. PMID: 33872837; PMCID: PMC8338769.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    14. 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). Kramer DR, Lee MB, Barbaro MF, Gogia AS, Peng T, Liu CY, Kellis S, Lee B. PMID: 32131064; PMCID: PMC7483626.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    15. SpikeDeep-classifier: a deep-learning based fully automatic offline spike sorting algorithm. J Neural Eng. 2021 02 05; 18(1). Saif-Ur-Rehman M, Ali O, Dyck S, Lienkämper R, Metzler M, Parpaley Y, Wellmer J, Liu C, Lee B, Kellis S, Andersen R, Iossifidis I, Glasmachers T, Klaes C. PMID: 33166944.
      View in: PubMed   Mentions: 3     Fields:    Translation:HumansAnimalsCells
    16. The Neurophysiological Representation of Imagined Somatosensory Percepts in Human Cortex. J Neurosci. 2021 03 10; 41(10):2177-2185. Bashford L, Rosenthal I, Kellis S, Pejsa K, Kramer D, Lee B, Liu C, Andersen RA. PMID: 33483431; PMCID: PMC8018772.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    17. The human primary somatosensory cortex encodes imagined movement in the absence of sensory information. Commun Biol. 2020 12 11; 3(1):757. Jafari M, Aflalo T, Chivukula S, Kellis SS, Salas MA, Norman SL, Pejsa K, Liu CY, Andersen RA. PMID: 33311578; PMCID: PMC7732821.
      View in: PubMed   Mentions: 11  Translation:HumansAnimalsCells
    18. Beta-band modulation in the human hippocampus during a conflict response task. J Neural Eng. 2020 11 11; 17(6). Chen KH, Gogia AS, Tang AM, Del Campo-Vera RM, Sebastian R, Nune G, Wong J, Liu CY, Kellis S, Lee B. PMID: 33059331.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    19. Gamma-band modulation in the human amygdala during reaching movements. Neurosurg Focus. 2020 07; 49(1):E4. Gogia AS, Martin Del Campo-Vera R, Chen KH, Sebastian R, Nune G, Kramer DR, Lee MB, Tafreshi AR, Barbaro MF, Liu CY, Kellis S, Lee B. PMID: 32610288; PMCID: PMC9651147.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    20. Thermal Analysis of a Skull Implant in Brain-Computer Interfaces. Annu Int Conf IEEE Eng Med Biol Soc. 2020 07; 2020:3066-3069. Serrano-Amenos C, Hu F, Wang PT, Kellis S, Andersen RA, Liu CY, Heydari P, Do AH, Nenadic Z. PMID: 33018652.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    21. 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. Sohn WJ, Wang PT, Kellis S, Andersen RA, Liu CY, Heydari P, Nenadic Z, Do AH. PMID: 33018656.
      View in: PubMed   Mentions: 2     Fields:    
    22. Beta-band power modulation in the human hippocampus during a reaching task. J Neural Eng. 2020 06 12; 17(3):036022. Del Campo-Vera RM, Gogia AS, Chen KH, Sebastian R, Kramer DR, Lee MB, Peng T, Tafreshi A, Barbaro MF, Liu CY, Kellis S, Lee B. PMID: 32413878; PMCID: PMC8544757.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    23. Comparison of Intraoperative 3-Dimensional Fluoroscopy With Standard Computed Tomography for Stereotactic Frame Registration. Oper Neurosurg (Hagerstown). 2020 06 01; 18(6):698-709. Peng T, Kramer DR, Lee MB, Barbaro MF, Ding L, Liu CY, Kellis S, Lee B. PMID: 31584102; PMCID: PMC7225008.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    24. 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. Pu H, Lim J, Kellis S, Liu CY, Andersen RA, Do AH, Heydari P, Nenadic Z. PMID: 32208379.
      View in: PubMed   Mentions: 3     Fields:    
    25. 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. Tafreshi AR, Peng T, Yu C, Kramer DR, Gogia AS, Lee MB, Barbaro MF, Sebastian R, Del Campo-Vera RM, Chen KH, Kellis SS, Lee B. PMID: 32298832.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    26. 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. Kramer DR, Lamorie-Foote K, Barbaro M, Lee MB, Peng T, Gogia A, Nune G, Liu CY, Kellis SS, Lee B. PMID: 32006952; PMCID: PMC7242113.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    27. 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. Andersen RA, Aflalo T, Kellis S. PMID: 31871144; PMCID: PMC6936686.
      View in: PubMed   Mentions: 18     Fields:    
    28. Functional Frequency Discrimination From Cortical Somatosensory Stimulation in Humans. Front Neurosci. 2019; 13:832. Kramer DR, Lamorie-Foote K, Barbaro M, Lee M, Peng T, Gogia A, Liu CY, Kellis SS, Lee B. PMID: 31440133; PMCID: PMC6692717.
      View in: PubMed   Mentions: 1  
    29. Clinical neuroprosthetics: Today and tomorrow. J Clin Neurosci. 2019 Oct; 68:13-19. Lee MB, Kramer DR, Peng T, Barbaro MF, Liu CY, Kellis S, Lee B. PMID: 31375306; PMCID: PMC6717542.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    30. SpikeDeeptector: a deep-learning based method for detection of neural spiking activity. J Neural Eng. 2019 07 23; 16(5):056003. Saif-Ur-Rehman M, Lienkämper R, Parpaley Y, Wellmer J, Liu C, Lee B, Kellis S, Andersen R, Iossifidis I, Glasmachers T, Klaes C. PMID: 31042684.
      View in: PubMed   Mentions: 8     Fields:    Translation:HumansCellsCTClinical Trials
    31. Directional tuning during reach planning in the supramarginal gyrus using local field potentials. J Clin Neurosci. 2019 Jun; 64:214-219. Barbaro MF, Kramer DR, Nune G, Lee MB, Peng T, Liu CY, Kellis S, Lee B. PMID: 31023574; PMCID: PMC7271900.
      View in: PubMed   Mentions: 2     Fields:    Translation:HumansCells
    32. Electrocorticographic changes in field potentials following natural somatosensory percepts in humans. Exp Brain Res. 2019 May; 237(5):1155-1167. Kramer DR, Barbaro MF, Lee M, Peng T, Nune G, Liu CY, Kellis S, Lee B. PMID: 30796470; PMCID: PMC7307440.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    33. Brain-Computer Interfaces in Quadriplegic Patients. Neurosurg Clin N Am. 2019 Apr; 30(2):275-281. Lee MB, Kramer DR, Peng T, Barbaro MF, Liu CY, Kellis S, Lee B. PMID: 30898278.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    34. 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. Kramer DR, Kellis S, Barbaro M, Salas MA, Nune G, Liu CY, Andersen RA, Lee B. PMID: 30711286; PMCID: PMC7330927.
      View in: PubMed   Mentions: 7     Fields:    Translation:Humans
    35. Engineering Artificial Somatosensation Through Cortical Stimulation in Humans. Front Syst Neurosci. 2018; 12:24. Lee B, Kramer D, Armenta Salas M, Kellis S, Brown D, Dobreva T, Klaes C, Heck C, Liu C, Andersen RA. PMID: 29915532; PMCID: PMC5994581.
      View in: PubMed   Mentions: 23  
    36. Utilizing Light-field Imaging Technology in Neurosurgery. Cureus. 2018 Apr 10; 10(4):e2459. Chen BR, Buchanan IA, Kellis S, Kramer D, Ohiorhenuan I, Blumenfeld Z, Grisafe Ii DJ, Barbaro MF, Gogia AS, Lu JY, Chen BB, Lee B. PMID: 29888163; PMCID: PMC5991932.
      View in: PubMed   Mentions: 1  
    37. Proprioceptive and cutaneous sensations in humans elicited by intracortical microstimulation. Elife. 2018 04 10; 7. Armenta Salas M, Bashford L, Kellis S, Jafari M, Jo H, Kramer D, Shanfield K, Pejsa K, Lee B, Liu CY, Andersen RA. PMID: 29633714; PMCID: PMC5896877.
      View in: PubMed   Mentions: 70     Fields:    Translation:Humans
    38. Non ictal onset zone: A window to ictal dynamics. Epilepsy Behav Case Rep. 2017; 8:123-127. Afra P, Hanrahan SJ, Kellis SS, House P. PMID: 29204348; PMCID: PMC5707213.
      View in: PubMed   Mentions:
    39. Multivariate regression methods for estimating velocity of ictal discharges from human microelectrode recordings. J Neural Eng. 2017 08; 14(4):044001. Liou JY, Smith EH, Bateman LM, McKhann GM, Goodman RR, Greger B, Davis TS, Kellis SS, House PA, Schevon CA. PMID: 28332484; PMCID: PMC5728389.
      View in: PubMed   Mentions: 16     Fields:    Translation:Humans
    40. The ictal wavefront is the spatiotemporal source of discharges during spontaneous human seizures. Nat Commun. 2016 Mar 29; 7:11098. Smith EH, Liou JY, Davis TS, Merricks EM, Kellis SS, Weiss SA, Greger B, House PA, McKhann GM, Goodman RR, Emerson RG, Bateman LM, Trevelyan AJ, Schevon CA. PMID: 27020798; PMCID: PMC4820627.
      View in: PubMed   Mentions: 66     Fields:    Translation:Humans
    41. Hand Shape Representations in the Human Posterior Parietal Cortex. J Neurosci. 2015 Nov 18; 35(46):15466-76. Klaes C, Kellis S, Aflalo T, Lee B, Pejsa K, Shanfield K, Hayes-Jackson S, Aisen M, Heck C, Liu C, Andersen RA. PMID: 26586832; PMCID: PMC4649012.
      View in: PubMed   Mentions: 27     Fields:    Translation:HumansCells
    42. Multi-scale analysis of neural activity in humans: Implications for micro-scale electrocorticography. Clin Neurophysiol. 2016 Jan; 127(1):591-601. Kellis S, Sorensen L, Darvas F, Sayres C, O'Neill K, Brown RB, House P, Ojemann J, Greger B. PMID: 26138146.
      View in: PubMed   Mentions: 33     Fields:    Translation:Humans
    43. Neurophysiology. Decoding motor imagery from the posterior parietal cortex of a tetraplegic human. Science. 2015 May 22; 348(6237):906-10. Aflalo T, Kellis S, Klaes C, Lee B, Shi Y, Pejsa K, Shanfield K, Hayes-Jackson S, Aisen M, Heck C, Liu C, Andersen RA. PMID: 25999506; PMCID: PMC4896830.
      View in: PubMed   Mentions: 185     Fields:    Translation:HumansCells
    44. Parietal neural prosthetic control of a computer cursor in a graphical-user-interface task. J Neural Eng. 2014 Dec; 11(6):066014. Revechkis B, Aflalo TN, Kellis S, Pouratian N, Andersen RA. PMID: 25394419; PMCID: PMC4381869.
      View in: PubMed   Mentions: 4     Fields:    Translation:Animals
    45. Toward more versatile and intuitive cortical brain-machine interfaces. Curr Biol. 2014 Sep 22; 24(18):R885-R897. Andersen RA, Kellis S, Klaes C, Aflalo T. PMID: 25247368; PMCID: PMC4410026.
      View in: PubMed   Mentions: 34     Fields:    Translation:Humans
    46. A cognitive neuroprosthetic that uses cortical stimulation for somatosensory feedback. J Neural Eng. 2014 Oct; 11(5):056024. Klaes C, Shi Y, Kellis S, Minxha J, Revechkis B, Andersen RA. PMID: 25242377; PMCID: PMC4410973.
      View in: PubMed   Mentions: 47     Fields:    Translation:Animals
    47. Potential for unreliable interpretation of EEG recorded with microelectrodes. Epilepsia. 2013 Aug; 54(8):1391-401. Stacey WC, Kellis S, Greger B, Butson CR, Patel PR, Assaf T, Mihaylova T, Glynn S. PMID: 23647099; PMCID: PMC3731390.
      View in: PubMed   Mentions: 10     Fields:    Translation:Humans
    48. 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. Smith E, Kellis S, House P, Greger B. PMID: 23283406; PMCID: PMC3602219.
      View in: PubMed   Mentions: 10     Fields:    Translation:Animals
    49. Signal distortion from microelectrodes in clinical EEG acquisition systems. J Neural Eng. 2012 Oct; 9(5):056007. Stacey WC, Kellis S, Patel PR, Greger B, Butson CR. PMID: 22878608; PMCID: PMC3476479.
      View in: PubMed   Mentions: 8     Fields:    Translation:Humans
    50. Decoding hand trajectories from micro-electrocorticography in human patients. Annu Int Conf IEEE Eng Med Biol Soc. 2012; 2012:4091-4. Kellis S, Hanrahan S, Davis T, House PA, Brown R, Greger B. PMID: 23366827.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    51. Information transfer along the ventral auditory processing stream in the awake macaque. Annu Int Conf IEEE Eng Med Biol Soc. 2012; 2012:5178-81. Smith EH, Kellis SS, House PA, Greger B. PMID: 23367095.
      View in: PubMed   Mentions: 2     Fields:    Translation:AnimalsCells
    52. Platinum microwire for subdural electrocorticography over human neocortex: millimeter-scale spatiotemporal dynamics. Annu Int Conf IEEE Eng Med Biol Soc. 2011; 2011:4761-5. Kellis S, Greger B, Hanrahan S, House P, Brown R. PMID: 22255402.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    53. Decoding spoken words using local field potentials recorded from the cortical surface. J Neural Eng. 2010 Oct; 7(5):056007. Kellis S, Miller K, Thomson K, Brown R, House P, Greger B. PMID: 20811093; PMCID: PMC2970568.
      View in: PubMed   Mentions: 86     Fields:    Translation:Humans
    54. Classification of spoken words using surface local field potentials. Annu Int Conf IEEE Eng Med Biol Soc. 2010; 2010:3827-30. Kellis S, Miller K, Thomson K, Brown R, House P, Greger B. PMID: 21097062.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    55. Human neocortical electrical activity recorded on nonpenetrating microwire arrays: applicability for neuroprostheses. Neurosurg Focus. 2009 Jul; 27(1):E9. Kellis SS, House PA, Thomson KE, Brown R, Greger B. PMID: 19569897; PMCID: PMC2941644.
      View in: PubMed   Mentions: 21     Fields:    Translation:Humans
    56. Multi-scale recordings for neuroprosthetic control of finger movements. Annu Int Conf IEEE Eng Med Biol Soc. 2009; 2009:4573-7. Baker J, Bishop W, Kellis S, Levy T, House P, Greger B. PMID: 19963841.
      View in: PubMed   Mentions: 7     Fields:    Translation:Animals
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