Artificial hand for prosthetic applications.
Vignesh Sompur, Asokan Thondiyath, Varadhan SKM, “Artificial hand for prosthetic applications", Indian Patent application: 202341011410 (Status: Granted). [Patent]
Posture correction system and method thereof
Rakhi Agarwal, Vignesh Sompur, Varadhan SKM & Domenico Campolo, “Posture correction system and method thereof”, Indian patent application: 202341039634. (Status: Granted). PCT Filing pending (to be filed by NTU). [Patent]
Task demands modulate distal limb handedness: A comparative analysis of prehensile synergies of the dominant and non-dominant hand
Prajwal Shenoy and Varadhan SKM (2024), “Task demands modulate distal limb handedness: A comparative analysis of prehensile synergies of the dominant and non-dominant hand”, Scientific Reports (Accepted)
Grasp context-dependent uncertainty alters the relative contribution of anticipatory and feedback-based mechanisms in object manipulation
Swarnab Dutta and Varadhan SKM(2024), “Grasp context-dependent uncertainty alters the relative contribution of anticipatory and feedback-based mechanisms in object manipulation" Neuropsychologia (accepted)
Older individuals do not show task specific variations in EEG band power and finger force coordination
Balasubramanian Eswari, Sivakumar Balasubramanian and Varadhan SKM(2024), “Older individuals do not show task specific variations in EEG band power and finger force coordination", IEEE Transactions on Biomedical Engineering.
A systematic investigation of detectors for low signal-to-noise ratio EMG signals
Yuvaraj M, Raja P, David A, Burdet E, S.K.M Varadhan, Balasubramanian S(2024), “A systematic investigation of detectors for low signal-to-noise ratio EMG signals", F1000Research 2024, 12:429, doi:10.12688/f1000research.132382.4)
Comparison of synergy patterns between the right and left hand while performing postures and object grasps
Shenoy P, Gupta A & S.K.M. Varadhan(2023), "Comparison of synergy patterns between the right and left hand while performing postures and object grasps", Sci Rep 13, 20290, doi:10.1038/s41598-023-47620-9
How to train your posture: Haptic feedback can be used for postural adaptation of the trunk during upper-limb motor training
Agarwal R, Hussain A, Domenico C., S.K.M Varadhan(2023), “How to train your posture: Haptic feedback can be used for postural adaptation of the trunk during upper-limb motor training” in IEEE Transactions on Haptics. doi: 10.1109/TOH.2023.3248619.
Let the Force Guide You: A Performance-Based Adaptive Algorithm for Postural Training using Haptic Feedback
Agarwal R, Hussain A, S.K.M Varadhan(2022), Domenico C, "Let the Force Guide You: A Performance-Based Adaptive Algorithm for Postural Training using Haptic Feedback" in Frontiers in Human Neuroscience. doi:10.3389/fnhum.2022.968669
Comparing algorithms for assessing upper limb use with inertial measurement units.
Subash T, David A, ReetaJanetSurekha S, Gayathri S, Samuelkamaleshkumar S, Magimairaj HP, Malesevic N, Antfolk C, SKM Varadhan, Melendez-Calderon A and Balasubramanian S(2022), "Comparing algorithms for assessing upper limb use with inertial measurement units." in Frontiers in Physiology. 13:1023589. doi:10.3389/fphys.2022.1023589
Evidence to support the mechanical advantage hypothesis of grasping at low force levels.
Rajakumar, B., S.K.M. Varadhan, "Evidence to support the mechanical advantage hypothesis of grasping at low force levels." Scientific Reports 12, 20834(2022). doi:10.1038/s41598-022-25351-7
Inverse saxophone - a device to study the role of individual finger perturbations on grasp stability
Jacob T, Dutta S, Annamalai S J, S.K.M Varadhan(2022), "Inverse saxophone - a device to study the role of individual finger perturbations on grasp stability" in Motor Control. Advance online publication. doi:10.1123/mc.2022-0098
Design and Validation of an IMU Based Full Hand Kinematic Measurement System.
Shenoy P, Gupta A and S.K.M Varadhan(2022), "Design and Validation of an IMU Based Full Hand Kinematic Measurement System," in IEEE Access, doi: 10.1109/ACCESS.2022.3203186.
Methods for Measurement and Analysis of Full Hand Angular Kinematics Using Electromagnetic Tracking Sensors.
Shenoy P, Sompur V and S.K.M Varadhan(2022). "Methods for Measurement and Analysis of Full Hand Angular Kinematics Using Electromagnetic Tracking Sensors," in IEEE Access, vol. 10, pp. 42673-42689 doi: 10.1109/ACCESS.2022.3168674.
Datasets of fingertip forces while grasping a handle with unsteady thumb platform.
Rajakumar B and S.K.M Varadhan(2022). Datasets of fingertip forces while grasping a handle with unsteady thumb platform. Scientific Data Jul 28;9(1):1-5. doi: 10.1038/s41597-022-01497-x
Support for mechanical advantage hypothesis of grasping cannot be explained only by task mechanics.
Rajakumar B, Dutta S, S.K.M Varadhan(2022) Support for mechanical advantage hypothesis of grasping cannot be explained only by task mechanics. Scientific Reports. 17;12(1):1-0. Doi: 10.1038/s41598-022-14014-2
A Framework for Sensor-Based Assessment of Upper-Limb Functioning in Hemiparesis.
David A, Subash T, S.K.M Varadhan(2022) Melendez-Calderon A, Balasubramanian S. A Framework for Sensor-Based Assessment of Upper-Limb Functioning in Hemiparesis. Frontiers in Human Neuroscience. Jul 22; 15:667509. Doi: 10.3389/fnhum.2021.667509
Role of post-trial visual feedback on unintentional force drift during isometric finger force production tasks.
Balamurugan S, Dhanush R, Varadhan S.K.M (2021). Role of post-trial visual feedback on unintentional force drift during isometric finger force production tasks. Motor Control. 10;26(1):1-4 Doi:10.1123/mc.2020-0031
Distinct behavior of the little finger during the vertical translation of an unsteady thumb platform while grasping.
Rajakumar B, Varadhan S.K.M (2021). Distinct behavior of the little finger during the vertical translation of an unsteady thumb platform while grasping. Scientific reports. 26;11(1):1-2. Doi: 10.1038/s41598-021-00420-5
Comparable behaviour of ring and little fingers due to an artificial reduction in thumb contribution to hold objects
Rajakumar B and Varadhan SKM. (2020) "Comparable behaviour of ring and little fingers due to an artificial reduction in thumb contribution to hold objects." PeerJ. 2020 Sep 17;8:e9962. https://doi.org/10.7717/peerj.9962.
Motor sequence learning data collected continuously for fifteen days of practice using a novel glove-based typing device
Dhanush Rachaveti and Varadhan SKM. (2020). Motor sequence learning data collected continuously for fifteen days of practice using a novel glove-based typing device. Data in Brief. 105234. 10.1016/j.dib.2020.105234.
Finger pressing task data collected with and without post-trial performance feedback
Balamurugan S and Varadhan SKM. (2020). Finger pressing task data collected with and without post-trial performance feedback. Data in Brief. 29. 105127. 10.1016/j.dib.2020.105127.
Wrist Posture Does Not Influence Finger Interdependence
Niranjan Chakrabhavi and Varadhan SKM. "Wrist Posture Does Not Influence Finger Interdependence." Journal of Applied Biomechanics(November 4, 2019): 10.1123/jab.2019-0010.
Posture similarity index: a method to compare hand postures in synergy space
Bhatt, Nayan, and Varadhan Skm. “Posture Similarity Index: A Method to Compare Hand Postures in Synergy Space.” PeerJ 6 (December 10, 2018): e6078. https://doi.org/10.7717/peerj.6078.
Thumbs up: movements made by the thumb are smoother and larger than fingers in finger-thumb opposition tasks
Rachaveti, Dhanush, Niranjan Chakrabhavi, Vaisakh Shankar, and Varadhan Skm. “Thumbs up: Movements Made by the Thumb Are Smoother and Larger than Fingers in Finger-Thumb Opposition Tasks.” PeerJ 6 (October 18, 2018): e5763. https://doi.org/10.7717/peerj.5763.
Age effects on rotational hand action
Varadhan SKM, Wei Zhang, Vladimir M. Zatsiorsky and Mark L. Latash, Age effects on rotational hand action, Human Movement Science, 2012 June, 31(3) 502 - 518 (Available in Pubmed Central)
Adaptive increase in force variance during fatigue in tasks with low redundancy
Tarkeshwar Singh, Varadhan SKM, Vladmir.M.Zatsiorsky and Mark.L.Latash, Adaptive increase in force variance during fatigue in tasks with low redundancy, Neuroscience Letters. 2010 Nov 26;485(3):204-7 (Available in Pubmed Central)
Variance components in discrete force production tasks
Varadhan SKM, Vladmir.M.Zatsiorsky and Mark.L.Latash, Variance components in discrete force production tasks, Experimental Brain Research 2010 Sep;205(3):335-49 (Available in Pubmed Central)
Fatigue and motor redundancy: adaptive increase in finger force variance in multi-finger tasks
Tarkeshwar Singh, Varadhan SKM, Vladmir.M.Zatsiorsky and Mark.L.Latash, Fatigue and motor redundancy: adaptive increase in finger force variance in multi-finger tasks, Journal of Neurophysiology. 2010 Jun;103(6):2990-300 (Available in Pubmed Central)
The sources of two components of variance: An example of multifinger cyclic force production tasks at different frequencies
Jason Friedman, Varadhan SKM, Vladimir M. Zatsiorsky, Mark L. Latash, The sources of two components of variance: An example of multifinger cyclic force production tasks at different frequencies, Experimental Brain Research 196(2) 263-277, (2009) (Available in Pubmed Central)