Kellis, Spencer

Combined from CaltechAUTHORS

• Shao, Xiecheng and Chung, Ryan S., el al. (2025) Directional hand movement can be classified from insular cortex SEEG signals using recurrent neural networks and high-gamma band features; Scientific Reports; Vol. 15; No. 1; 29993; PMCID PMC12357955; 10.1038/s41598-025-14805-3
• Bjånes, David A. and Kellis, Spencer, el al. (2025) Quantifying physical degradation alongside recording and stimulation performance of 980 intracortical microelectrodes chronically implanted in three humans for 956-2130 days; Acta Biomaterialia; Vol. 198; 188-206; PMCID PMC12282554; 10.1016/j.actbio.2025.02.030
• Lim, Jeffrey and Wang, Po T., el al. (2023) Suppression of cortical electrostimulation artifacts using pre-whitening and null projection; Journal of Neural Engineering; Vol. 20; No. 5; 056018; 10.1088/1741-2552/acf68b
• Rosenthal, Isabelle A. and Bashford, Luke, el al. (2023) S1 represents multisensory contexts and somatotopic locations within and outside the bounds of the cortical homunculus; Cell Reports; Vol. 42; No. 4; 112312; PMCID PMC10544688; 10.1016/j.celrep.2023.112312
• Sohn, Won Joon and Lim, Jeffrey, el al. (2023) Benchtop and bedside validation of a low-cost programmable cortical stimulator in a testbed for bi-directional brain-computer-interface research; Frontiers in Neuroscience; Vol. 16; Art. No. 1075971; PMCID PMC9878125; 10.3389/fnins.2022.1075971
• Rosenthal, Isabelle A. and Bashford, Luke, el al. (2022) S1 represents multisensory contexts and somatotopic locations within and outside the bounds of the cortical homunculus; 10.1101/2022.08.29.505313
• Wandelt, Sarah K. and Kellis, Spencer, el al. (2022) Decoding grasp and speech signals from the cortical grasp circuit in a tetraplegic human; Neuron; Vol. 110; No. 11; 1777-1787; PMCID PMC9186423; 10.1016/j.neuron.2022.03.009
• Chen, Kuang-Hsuan and Tang, Austin M., el al. (2022) Theta low-gamma phase amplitude coupling in the human orbitofrontal cortex increases during a conflict-processing task; Journal of Neural Engineering; Vol. 19; No. 1; Art. No. 016026; 10.1088/1741-2552/ac4f9b
• Martin del Campo-Vera, Roberto and Tang, Austin M., el al. (2022) Neuromodulation in Beta-Band Power Between Movement Execution and Inhibition in the Human Hippocampus; Neuromodulation: Technology at the Neural Interface; Vol. 25; No. 2; 232-244; 10.1111/ner.13486
• Andersen, Richard A. and Aflalo, Tyson, el al. (2022) Exploring Cognition with Brain–Machine Interfaces; Annual Review of Psychology; Vol. 73; 131-158; 10.1146/annurev-psych-030221-030214
• Tang, Austin M. and Chen, Kuang-Hsuan, el al. (2021) Amygdaloid theta-band power increases during conflict processing in humans; Journal of Clinical Neuroscience; Vol. 91; 183-192; 10.1016/j.jocn.2021.07.001
• Szymanski, Linda J. and Kellis, Spencer, el al. (2021) Neuropathological effects of chronically implanted, intracortical microelectrodes in a tetraplegic patient; Journal of Neural Engineering; Vol. 18; No. 4; Art. No. 0460b9; 10.1088/1741-2552/ac127e
• Tang, Austin M. and Chen, Kuang-Hsuan, el al. (2021) Hippocampal and Orbitofrontal Theta Band Coherence Diminishes During Conflict Resolution; World Neurosurgery; Vol. 152; e32-e44; 10.1016/j.wneu.2021.04.023
• Kramer, Daniel Richard and Lee, Morgan Brianna, el al. (2021) Mapping of primary somatosensory cortex of the hand area using a high-density electrocorticography grid for closed-loop brain computer interface; Journal of Neural Engineering; Vol. 18; No. 3; Art. No. 036009; 10.1088/1741-2552/ab7c8e
• Bashford, Luke and Rosenthal, Isabelle, el al. (2021) The Neurophysiological Representation of Imagined Somatosensory Percepts in Human Cortex; Journal of Neuroscience; Vol. 41; No. 10; 2177-2185; PMCID PMC8018772; 10.1523/jneurosci.2460-20.2021
• Saif-ur-Rehman, Muhammad and Ali, Omair, el al. (2021) SpikeDeep-classifier: a deep-learning based fully automatic offline spike sorting algorithm; Journal of Neural Engineering; Vol. 18; No. 1; Art. No. 016009; 10.1088/1741-2552/abc8d4
• Jafari, Matiar and Aflalo, Tyson, el al. (2020) The human primary somatosensory cortex encodes imagined movement in the absence of sensory information; Communications Biology; Vol. 3; No. 1; Art. No. 757; 10.1038/s42003-020-01484-1
• Tafreshi, Ali R. and Peng, Terrance, el al. (2020) A Phantom Study of the Spatial Precision and Accuracy of Stereotactic Localization Using Computed Tomography Imaging with the Leksell Stereotactic System; World Neurosurgery; Vol. 139; e297-e307; 10.1016/j.wneu.2020.03.204
• Sohn, Won J. and Wang, Po T., el al. (2020) A Prototype of a Fully-Implantable Charge-Balanced Artificial Sensory Stimulator for Bi-directional Brain-Computer-Interface (BD-BCI); ISBN 9781728119908; 2020 42nd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC); 3082-3085; 10.1109/embc44109.2020.9176718
• Serrano-Amenos, Claudia and Hu, Frank, el al. (2020) Thermal Analysis of a Skull Implant in Brain-Computer Interfaces; ISBN 9781728119908; 2020 42nd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC); 3066-3069; 10.1109/embc44109.2020.9175483
• Gogia, Angad S. and Del Campo-Vera, Roberto Martin, el al. (2020) Gamma-band modulation in the human amygdala during reaching movements; Neurosurgical Focus; Vol. 49; No. 1; Art. No. E4; 10.3171/2020.4.focus20179
• Del Campo-Vera, Roberto Martin and Gogia, Angad S., el al. (2020) Beta-band power modulation in the human hippocampus during a reaching task; Journal of Neural Engineering; Vol. 17; No. 3; Art. No. 036022; 10.1088/1741-2552/ab937f
• Peng, Terrance and Kramer, Daniel R., el al. (2020) Comparison of Intraoperative 3-Dimensional Fluoroscopy With Standard Computed Tomography for Stereotactic Frame Registration; Operative Neurosurgery; Vol. 18; No. 6; 698-709; PMCID PMC7225008; 10.1093/ons/opz296
• Jaffari, Matiar and Aflalo, Tyson, el al. (2020) Neural correlates of cognitive motor signals in primary somatosensory cortex; 10.1101/2020.04.20.041269
• Pu, Haoran and Lim, Jeffrey, el al. (2020) Optimal artifact suppression in simultaneous electrocorticography stimulation and recording for bi-directional brain-computer interface applications; Journal of Neural Engineering; Vol. 17; No. 2; Art. No. 026038; 10.1088/1741-2552/ab82ac
• Kramer, Daniel R. and Lamorie-Foote, Krista, el al. (2020) Utility and lower limits of frequency detection in surface electrode stimulation for somatosensory brain-computer interface in humans; Neurosurgical Focus; Vol. 48; No. 2; Art. No. E2; PMCID PMC7242113; 10.3171/2019.11.focus19696
• Barbaro, Michael F. and Chesney, Kelsi, el al. (2020) Dual responsive neurostimulation implants for epilepsy; Journal of Neurosurgery; Vol. 132; No. 1; 225-231; 10.3171/2018.8.JNS181362
• Andersen, Richard A. and Aflalo, Tyson, el al. (2019) From thought to action: The brain–machine interface in posterior parietal cortex; Proceedings of the National Academy of Sciences of the United States of America; Vol. 116; No. 52; 26274-26279; PMCID PMC6936686; 10.1073/pnas.1902276116
• Haghi, Benyamin and Kellis, Spencer, el al. (2019) Deep Multi-State Dynamic Recurrent Neural Networks Operating on Wavelet Based Neural Features for Robust Brain Machine Interfaces; 10.1101/710327
• Saif-ur-Rehman, Muhammad and Lienkämper, Robin, el al. (2019) SpikeDeeptector: A deep-learning based method for detection of neural spiking activity; Journal of Neural Engineering; Vol. 16; No. 5; Art. No. 056003; 10.1088/1741-2552/ab1e63
• Lee, Morgan B. and Kramer, Daniel R., el al. (2019) Clinical neuroprosthetics: Today and tomorrow; Journal of Clinical Neuroscience; Vol. 68; 13-19; PMCID PMC6717542; 10.1016/j.jocn.2019.07.056
• Kramer, Daniel R. and Lamorie-Foote, Krista, el al. (2019) Functional Frequency Discrimination From Cortical Somatosensory Stimulation in Humans; Frontiers in Neuroscience; Vol. 13; Art. No. 832; 10.3389/fnins.2019.00832
• Miller, Carol and Szymanski, Linda, el al. (2019) Neuropathology of chronically implanted, intracortical electrodes in a tetraplegic patient with robotic arm interface; Journal of Neuropathology and Experimental Neurology; Vol. 78; No. 6; 578-579; 10.1093/jnen/nlz034
• Barbaro, Michael F. and Kramer, Daniel R., el al. (2019) Directional tuning during reach planning in the supramarginal gyrus using local field potentials; Journal of Clinical Neuroscience; Vol. 64; 214-219; PMCID PMC7271900; 10.1016/j.jocn.2019.03.061
• Kramer, Daniel R. and Barbaro, Michael F., el al. (2019) Electrocorticographic changes in field potentials following natural somatosensory percepts in humans; Experimental Brain Research; Vol. 237; No. 5; 1155-1167; PMCID PMC7307440; 10.1007/s00221-019-05495-1
• Kramer, Daniel R. and Kellis, Spencer, el al. (2019) Technical considerations for generating somatosensation via cortical stimulation in a closed-loop sensory/motor brain-computer interface system in humans; Journal of Clinical Neuroscience; Vol. 63; 116-121; PMCID PMC7330927; 10.1016/j.jocn.2019.01.027
• Lee, Morgan B. and Kramer, Daniel R., el al. (2019) Brain-Computer Interfaces in Quadriplegic Patients; Neurosurgery Clinics of North America; Vol. 30; No. 2; 275-281; 10.1016/j.nec.2018.12.009
• Shah, Sahil and Haghi, Benyamin, el al. (2019) Decoding Kinematics from Human Parietal Cortex using Neural Networks; ISBN 9781538679210; 2019 9th International IEEE/EMBS Conference on Neural Engineering (NER); 1138-1141; 10.1109/ner.2019.8717137
• Lim, Jeffrey and Wang, Po T., el al. (2019) Dipole Cancellation as an Artifact Suppression Technique in Simultaneous Electrocorticography Stimulation and Recording; ISBN 9781538679210; 2019 9th International IEEE/EMBS Conference on Neural Engineering (NER); 725-729; 10.1109/NER.2019.8716961
• Lee, Brian and Kramer, Daniel, el al. (2018) Engineering Artificial Somatosensation Through Cortical Stimulation in Humans; Frontiers in Systems Neuroscience; Vol. 12; Art. No. 24; PMCID PMC5994581; 10.3389/fnsys.2018.00024
• Armenta Salas, Michelle and Bashford, Luke, el al. (2018) Proprioceptive and cutaneous sensations in humans elicited by intracortical microstimulation; eLife; Vol. 7; Art. No. e32904; PMCID PMC5896877; 10.7554/eLife.32904.001
• Chen, Brian R. and Buchanan, Ian A., el al. (2018) Utilizing Light-field Imaging Technology in Neurosurgery; Cureus; Vol. 10; No. 4; Art. No. e2459; PMCID PMC5991932; 10.7759/cureus.2459
• Afra, Pegah and Hanrahan, Sara J., el al. (2017) Non ictal onset zone: A window to ictal dynamics; Epilepsy & Behavior Case Reports; Vol. 8; 123-127; PMCID PMC5707213; 10.1016/j.ebcr.2017.10.003
• Liou, Jyun-you and Smith, Elliot H., el al. (2017) Multivariate regression methods for estimating velocity of ictal discharges from human microelectrode recordings; Journal of Neural Engineering; Vol. 14; No. 4; Art. No. 044001; PMCID PMC5728389; 10.1088/1741-2552/aa68a6
• Smith, Elliot H. and Liou, Jyun-you, el al. (2016) The ictal wavefront is the spatiotemporal source of discharges during spontaneous human seizures; Nature Communications; Vol. 7; Art. No. 11098; PMCID PMC4820627; 10.1038/ncomms11098
• Warren, David J. and Kellis, Spencer, el al. (2016) Recording and Decoding for Neural Prostheses; Proceedings of the IEEE; Vol. 104; No. 2; 374-391; 10.1109/JPROC.2015.2507180
• Kellis, Spencer and Sorensen, Larry, el al. (2016) Multi-scale analysis of neural activity in humans: Implications for micro-scale electrocorticography; Clinical Neurophysiology; Vol. 127; No. 1; 591-601; 10.1016/j.clinph.2015.06.002
• Klaes, Christian and Kellis, Spencer, el al. (2015) Hand Shape Representations in the Human Posterior Parietal Cortex; Journal of Neuroscience; Vol. 35; No. 46; 15466-15476; PMCID PMC4649012; 10.1523/JNEUROSCI.2747-15.2015
• Aflalo, Tyson and Kellis, Spencer, el al. (2015) Decoding Motor Imagery from the Posterior Parietal Cortex of a Tetraplegic Human; Science; Vol. 348; No. 6237; 906-910; PMCID PMC4896830; 10.1126/science.aaa5417
• Revechkis, Boris and Aflalo, Tyson N. S., el al. (2014) Parietal neural prosthetic control of a computer cursor in a graphical-user-interface task; Journal of Neural Engineering; Vol. 11; No. 6; Art. No. 066014; PMCID PMC4381869; 10.1088/1741-2560/11/6/066014
• Katyal, Kapil D. and Johannes, Matthew S., el al. (2014) A collaborative BCI approach to autonomous control of a prosthetic limb system; ISBN 9781479938407; 2014 IEEE International Conference on Systems, Man, and Cybernetics; 1479-1482; 10.1109/smc.2014.6974124
• Klaes, Christian and Shi, Ying, el al. (2014) A cognitive neuroprosthetic that uses cortical stimulation for somatosensory feedback; Journal of Neural Engineering; Vol. 11; No. 5; Art. No. 056024; PMCID PMC4410973; 10.1088/1741-2560/11/5/056024
• Andersen, Richard A. and Kellis, Spencer, el al. (2014) Toward More Versatile and Intuitive Cortical Brain–Machine Interfaces; Current Biology; Vol. 24; No. 18; R885-R897; PMCID PMC4410026; 10.1016/j.cub.2014.07.068
• Redd, Bennion and Kellis, Spencer, el al. (2014) The Impact of Process Scaling on Scratchpad Memory Energy Savings; Journal of Low Power Electronics and Applications; Vol. 4; No. 3; 231-251; 10.3390/jlpea4030231
• Stacey, William C. and Kellis, Spencer, el al. (2013) Potential for unreliable interpretation of EEG recorded with microelectrodes; Epilepsia; Vol. 54; No. 8; 1391-1401; PMCID PMC3731390; 10.1111/epi.12202
• Smith, Elliot and Kellis, Spencer, el al. (2013) 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; Journal of Neural Engineering; Vol. 10; No. 1; Art. No. 016010; PMCID PMC3602219; 10.1088/1741-2560/10/1/016010
• Stacey, William C. and Kellis, Spencer, el al. (2012) Signal distortion from microelectrodes in clinical EEG acquisition systems; Journal of Neural Engineering; Vol. 9; No. 5; Art. No. 056007; PMCID PMC3476479; 10.1088/1741-2560/9/5/056007
• Smith, Elliot H. and Kellis, Spencer S., el al. (2012) Information transfer along the ventral auditory processing stream in the awake macaque; ISBN 9781457717871; 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society; 5178-5181; 10.1109/embc.2012.6347160
• Kellis, Spencer and Hanrahan, Sara J., el al. (2012) Decoding Hand Trajectories from Micro-Electrocorticography in Human Patients; ISBN 978-1-4244-4119-8; 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society; 4091-4094; 10.1109/EMBC.2012.6346866
• Kellis, Spencer and Greger, Bradley, el al. (2011) Platinum microwire for subdural electrocorticography over human neocortex: Millimeter-scale spatiotemporal dynamics; ISBN 9781457715891; 33rd Annual International Conference of the IEEE EMBS; 4761-4765; 10.1109/iembs.2011.6091179
• Kellis, Spencer and Miller, Kai, el al. (2010) Decoding spoken words using local field potentials recorded from the cortical surface; Journal of Neural Engineering; Vol. 7; No. 5; Art. No. 056007; PMCID PMC2970568; 10.1088/1741-2560/7/5/056007
• Kellis, Spencer and Miller, Kai, el al. (2010) Classification of spoken words using surface local field potentials; ISBN 9781424441235; 32nd Annual International Conference of the IEEE EMBS; 3827-3830; 10.1109/iembs.2010.5627682
• Baker, Justin and Bishop, William, el al. (2009) Multi-scale recordings for neuroprosthetic control of finger movements; 10.1109/iembs.2009.5332692
• Kellis, Spencer S. and House, Paul A., el al. (2009) Human neocortical electrical activity recorded on nonpenetrating microwire arrays: applicability for neuroprostheses; Neurosurgical Focus; Vol. 27; No. 1; Art. No. E9; PMCID PMC2941644; 10.3171/2009.4.focus0974
• Henrie, Justin and Kellis, Spencer, el al. (2004) Electronic color charts for dielectric films on silicon; Optics Express; Vol. 12; No. 7; 1464-1469; 10.1364/opex.12.001464