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One representative task is piano playing, which involves fast performance of a sequence of complex motions with high spatiotemporal precision. However, for several decades, a lack of contactless sensing technologies that are capable of precision measurement of piano key motions has been a bottleneck for unveiling how such an outstanding skill is cultivated. Here, we developed a novel sensing system that can record the vertical position of all piano keys with a time resolution of 1 ms and a spatial resolution of 0.01 mm in a noncontact manner. Using this system, we recorded the piano key motions while 49 pianists played a complex sequence of tones that required both individuated and coordinated finger movements to be performed as fast and accurately as possible. Penalized regression using various feature variables of the key motions identified distinct characteristics of the key-depressing and key-releasing motions in relation to the speed and accuracy of the performance. For the maximum rate of the keystrokes, individual differences across the pianists were associated with the peak key descending velocity, the key depression duration, and key-lift timing. For the timing error of the keystrokes, the interindividual differences were associated with the peak ascending velocity of the key and the inter-strike variability of both the peak key descending velocity and the key depression duration. These results highlight the importance of dexterous control of the vertical motions of the keys for fast and accurate piano performance.<\/jats:p>","DOI":"10.3390\/s22134891","type":"journal-article","created":{"date-parts":[[2022,6,29]],"date-time":"2022-06-29T22:43:28Z","timestamp":1656542608000},"page":"4891","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Noncontact and High-Precision Sensing System for Piano Keys Identified Fingerprints of Virtuosity"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5805-2378","authenticated-orcid":false,"given":"Takanori","family":"Oku","sequence":"first","affiliation":[{"name":"Sony Computer Science Laboratories Inc., 3-14-13 Higashigotanda, Shinagawa-ku, Tokyo 1410022, Japan"},{"name":"NeuroPiano Institute, 13-1 Hontorocho, Shimogyo Ward, Kyoto 6008086, Japan"},{"name":"Yotsuya Campus, Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo 1028554, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1387-6645","authenticated-orcid":false,"given":"Shinichi","family":"Furuya","sequence":"additional","affiliation":[{"name":"Sony Computer Science Laboratories Inc., 3-14-13 Higashigotanda, Shinagawa-ku, Tokyo 1410022, Japan"},{"name":"NeuroPiano Institute, 13-1 Hontorocho, Shimogyo Ward, Kyoto 6008086, Japan"},{"name":"Yotsuya Campus, Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo 1028554, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,6,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"381","DOI":"10.1037\/h0055392","article-title":"The Information Capacity of the Human Motor System in Controlling the Amplitude of Movement","volume":"47","author":"Fitts","year":"1954","journal-title":"J. Exp. Psychol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1016\/j.neures.2015.12.001","article-title":"The Curse of Motor Expertise: Use-Dependent Focal Dystonia as a Manifestation of Maladaptive Changes in Body Representation","volume":"104","author":"Furuya","year":"2016","journal-title":"Neurosci. Res."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1007\/BF02450317","article-title":"Anticipatory and Sequential Motor Control in Piano Playing","volume":"113","author":"Engel","year":"1997","journal-title":"Exp. Brain Res."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Goebl, W., and Palmer, C. (2013). Temporal Control and Hand Movement Efficiency in Skilled Music Performance. PLoS ONE, 8.","DOI":"10.1371\/journal.pone.0050901"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Dalla Bella, S., and Palmer, C. (2011). Rate Effects on Timing, Key Velocity, and Finger Kinematics in Piano Performance. PLoS ONE, 6.","DOI":"10.1371\/journal.pone.0020518"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1869","DOI":"10.1016\/j.cub.2010.09.045","article-title":"Encoding of Motor Skill in the Corticomuscular System of Musicians","volume":"20","author":"Gentner","year":"2010","journal-title":"Curr. Biol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"2383","DOI":"10.1523\/JNEUROSCI.23-06-02383.2003","article-title":"Coarticulation in Fluent Fingerspelling","volume":"23","author":"Jerde","year":"2003","journal-title":"J. Neurosci."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Aw, K., Budd, J., and Wilshaw-Sparkes, T. (2022). Data Glove Using Soft and Stretchable Piezoresistive Sensors. Micromachines, 13.","DOI":"10.3390\/mi13030372"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"721","DOI":"10.1007\/s00371-006-0080-9","article-title":"Estimation of Missing Markers in Human Motion Capture","volume":"22","author":"Liu","year":"2006","journal-title":"Vis. Comput."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2678","DOI":"10.1152\/jn.2001.86.6.2678","article-title":"Control of Finger Grip Forces in Overarm Throws Made by Skilled Throwers","volume":"86","author":"Hore","year":"2001","journal-title":"J. Neurophysiol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"2024","DOI":"10.1152\/jn.00059.2011","article-title":"Skilled Throwers Use Physics to Time Ball Release to the Nearest Millisecond","volume":"106","author":"Hore","year":"2011","journal-title":"J. Neurophysiol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1012","DOI":"10.3389\/fpsyg.2014.01012","article-title":"Sensory Trick Phenomenon Improves Motor Control in Pianists with Dystonia: Prognostic Value of Glove-Effect","volume":"5","author":"Paulig","year":"2014","journal-title":"Front. Psychol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3389\/fnhum.2013.00297","article-title":"Focal Dystonia in Musicians: Linking Motor Symptoms to Somatosensory Dysfunction","volume":"7","author":"Konczak","year":"2013","journal-title":"Front. Hum. Neurosci."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2849","DOI":"10.1152\/jn.00378.2011","article-title":"Hand Kinematics of Piano Playing","volume":"106","author":"Furuya","year":"2011","journal-title":"J. Neurophysiol."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"2060","DOI":"10.1152\/jn.00378.2012","article-title":"Speed Invariance of Independent Control of Finger Movements in Pianists","volume":"108","author":"Furuya","year":"2012","journal-title":"J. Neurophysiol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"230","DOI":"10.1152\/jn.00973.2012","article-title":"Patterns of Muscle Activity for Digital Coarticulation","volume":"110","author":"Winges","year":"2013","journal-title":"J. Neurophysiol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"527","DOI":"10.1111\/j.1469-7580.2006.00545.x","article-title":"What Can Studying Musicians Tell Us about Motor Control of the Hand?","volume":"208","author":"Watson","year":"2006","journal-title":"J. Anat."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1063","DOI":"10.1016\/S0021-9290(98)00113-4","article-title":"Assessment of Dynamic Finger Forces in Pianists: Effects of Training and Expertise","volume":"31","author":"Parlitz","year":"1998","journal-title":"J. Biomech."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"390","DOI":"10.1016\/j.neuroscience.2008.07.028","article-title":"Expertise-Dependent Modulation of Muscular and Non-Muscular Torques in Multi-Joint Arm Movements during Piano Keystroke","volume":"156","author":"Furuya","year":"2008","journal-title":"Neuroscience"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2959","DOI":"10.1121\/1.2717493","article-title":"Loudness Control in Pianists as Exemplified in Keystroke Force Measurements on Different Touches","volume":"121","author":"Kinoshita","year":"2007","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1603","DOI":"10.1007\/s00221-017-4926-3","article-title":"Skilful Force Control in Expert Pianists","volume":"235","author":"Oku","year":"2017","journal-title":"Exp. Brain Res."},{"key":"ref_22","unstructured":"Grosshauser, T., and Tr\u00f6ster, G. (2013, January 27\u201330). Finger Position and Pressure Sensing Techniques for String and Keyboard Instruments. Proceedings of the International Conference on New Interfaces for Musical Expression, Daejeon, Korea."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"13360","DOI":"10.1038\/srep13360","article-title":"Losing Dexterity: Patterns of Impaired Coordination of Finger Movements in Musician\u2019s Dystonia","volume":"5","author":"Furuya","year":"2015","journal-title":"Sci. Rep."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Tominaga, K., Lee, A., Altenm\u00fcller, E., Miyazaki, F., and Furuya, S. (2016). Kinematic Origins of Motor Inconsistency in Expert Pianists. PLoS ONE, 11.","DOI":"10.1371\/journal.pone.0161324"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"152","DOI":"10.1016\/j.neuroscience.2013.05.025","article-title":"Finger-Specific Loss of Independent Control of Movements in Musicians with Focal Dystonia","volume":"247","author":"Furuya","year":"2013","journal-title":"Neuroscience"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Furuya, S., Nitsche, M.A., Paulus, W., and Altenm\u00fcller, E. (2013). Early Optimization in Finger Dexterity of Skilled Pianists: Implication of Transcranial Stimulation. BMC Neurosci., 14.","DOI":"10.1186\/1471-2202-14-35"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"37632","DOI":"10.1038\/srep37632","article-title":"Shared Somatosensory and Motor Functions in Musicians","volume":"6","author":"Hosoda","year":"2016","journal-title":"Sci. Rep."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1002\/mds.10671","article-title":"Quantification of Focal Dystonia in Pianists Using Scale Analysis","volume":"19","author":"Jabusch","year":"2004","journal-title":"Mov. Disord."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"268","DOI":"10.1016\/j.ijpsycho.2009.12.008","article-title":"Psycho-Physiological Responses to Expressive Piano Performance","volume":"75","author":"Nakahara","year":"2010","journal-title":"Int. J. Psychophysiol."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"949","DOI":"10.1037\/0096-1523.29.5.949","article-title":"Auditory Feedback in Music Performance: Evidence for a Dissociation of Sequencing and Timing","volume":"29","author":"Pfordresher","year":"2003","journal-title":"J. Exp. Psychol. Hum. Percept. Perform."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"3862","DOI":"10.1121\/1.413065","article-title":"Acoustics, Perception, and Production of Legato Articulation on a Digital Piano","volume":"97","author":"Repp","year":"1995","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"290","DOI":"10.1016\/j.neuroscience.2014.03.058","article-title":"Expert Pianists Do Not Listen: The Expertise-Dependent Influence of Temporal Perturbation on the Production of Sequential Movements","volume":"269","author":"Molendijk","year":"2014","journal-title":"Neuroscience"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"3555","DOI":"10.1007\/s00221-014-4036-4","article-title":"Playing Beautifully When You Have to Be Fast: Spatial and Temporal Symmetries of Movement Patterns in Skilled Piano Performance at Different Tempi","volume":"232","author":"Furuya","year":"2014","journal-title":"Exp. Brain Res."},{"key":"ref_34","unstructured":"MIDI Manufacturers Association (1996). MIDI 1.0 Detailed Specification, The International MIDI Association."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1111\/j.1467-9868.2005.00503.x","article-title":"Regularization and Variable Selection via the Elastic Net","volume":"67","author":"Zou","year":"2005","journal-title":"J. R. Stat. Soc. Ser. B Stat. Methodol."},{"key":"ref_36","first-page":"2825","article-title":"Scikit-Learn: Machine Learning in Python","volume":"12","author":"Pedregosa","year":"2011","journal-title":"J. Mach. Learn. Res."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1148","DOI":"10.1093\/cercor\/bhz154","article-title":"Specialized Somatosensory\u2013Motor Integration Functions in Musicians","volume":"30","author":"Hirano","year":"2020","journal-title":"Cereb. Cortex"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"eabd2558","DOI":"10.1126\/sciadv.abd2558","article-title":"Overcoming the Ceiling Effects of Experts\u2019 Motor Expertise through Active Haptic Training","volume":"6","author":"Hirano","year":"2020","journal-title":"Sci. Adv."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"292","DOI":"10.1038\/nrn2258","article-title":"Noise in the Nervous System","volume":"9","author":"Faisal","year":"2008","journal-title":"Nat. Rev. Neurosci."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"508","DOI":"10.1037\/a0017604","article-title":"Auditory Imagery Shapes Movement Timing and Kinematics: Evidence from a Musical Task","volume":"36","author":"Keller","year":"2010","journal-title":"J. Exp. Psychol. Hum. Percept. Perform."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"2397","DOI":"10.1113\/JP275813","article-title":"Aberrant Cortical Excitability Reflects the Loss of Hand Dexterity in Musician\u2019s Dystonia","volume":"596","author":"Furuya","year":"2018","journal-title":"J. Physiol."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"173","DOI":"10.3389\/fnhum.2013.00173","article-title":"Flexibility of Movement Organization in Piano Performance","volume":"7","author":"Furuya","year":"2013","journal-title":"Front. Hum. Neurosci."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"2839","DOI":"10.1121\/1.4896461","article-title":"Perception of Touch Quality in Piano Tones","volume":"136","author":"Goebl","year":"2014","journal-title":"J. Acoust. Soc. Am."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/13\/4891\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T23:40:12Z","timestamp":1760139612000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/13\/4891"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,6,29]]},"references-count":43,"journal-issue":{"issue":"13","published-online":{"date-parts":[[2022,7]]}},"alternative-id":["s22134891"],"URL":"https:\/\/doi.org\/10.3390\/s22134891","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,6,29]]}}}