F. Sergi

Intensity Dependent Inhibition of Single Pulse TMS on Stretch-Evoked Long-Latency Responses in the Flexor Carpi Radialis

This study investigates how different TMS intensities affect stretch-evoked long-latency responses in the flexor carpi radialis, finding that only suprathreshold TMS inhibits these responses via a cortical silent period.

Development of an MRI-compatible robotic perturbation system for studying the task-dependent contribution of the brainstem to long-latency responses

The paper develops an MRI-compatible robotic system to study brainstem contributions to motor responses during different tasks, showing task-dependent changes in muscle activity and brain activation.

Development of an Experimental Protocol to Study the Neural Control of Force and Impedance in Wrist Movements with Robotics and fMRI

This study develops an experimental protocol to decouple force and impedance control in wrist movements using robotics and fMRI, showing distinct torque and stiffness responses to different force conditions.

Modeling Neuromotor Adaptation to Pulsed Torque Assistance During Walking

This paper validates existing models of motor learning in gait training and proposes a modified use-dependent learning model that achieves better fit with fewer parameters.

Estimating Propulsion Kinetics in Absence of a Direct Measurement of the Anterior Component of Ground Reaction Force

The paper develops models to estimate anterior ground reaction force (AGRF) using kinematic and kinetic metrics in the absence of direct measurement.

A Multi-objective Simulation-Optimization Framework for the Design of a Compliant Gravity Balancing Orthosis

This paper presents a simulation-optimization framework to design gravity-balancing orthoses that balance compensation accuracy and device protrusion.

Model-Based Estimation of Active and Passive Muscle Forces Using MRE in Forearm Muscles During 2-DOF Wrist Tasks

This paper develops a novel MRE-based muscle force estimator that separates shear wave speed into active and passive components, improving offset parameter estimation without affecting slope parameter accuracy.

Concurrent Contribution of Co-contraction to Error Reduction during Dynamic Adaptation of the Wrist

The paper validates MR-SoftWrist measurements of wrist adaptation and shows that impedance control via co-contraction reduces trajectory errors beyond adaptation.

Changes in resting state functional connectivity associated with dynamic adaptation of wrist movements

This study investigates changes in resting state functional connectivity after dynamic adaptation of wrist movements, linking neural network changes to memory formation and motor control strategies.

Using Repetitive Control to Enhance Force Control During Human-Robot Interaction in Quasi-Periodic Tasks

This study evaluates repetitive control methods for improving force control in human-robot interaction during quasi-periodic tasks, showing significant error reduction compared to a passive proportional controller.

Using Bayesian Optimization to Identify Optimal Exoskeleton Parameters Targeting Propulsion Mechanics: A Simulation Study

This study uses Bayesian optimization to simulate human-in-the-loop experiments for optimizing exoskeleton parameters based on propulsion mechanics, finding expected improvement as the most effective acquisition method.

Robot-aided Training of Propulsion During Walking: Effects of Torque Pulses Applied to the Hip and Knee Joints During Stance

This study evaluates how torque pulses applied to hip and knee joints during walking affect propulsion metrics, finding that pulse timing and type significantly modulate hip extension and propulsive impulse.

A Controlled Slip: Training Propulsion via Acceleration of the Trailing Limb

This paper introduces a gait training method using a dual belt treadmill to enhance propulsion mechanics and walking speed by accelerating the trailing limb during push-off.

Identifying the neural representation of fast and slow states in force field adaptation via fMRI

The paper simulates an fMRI experiment to identify neural representations of fast and slow learning states during force field adaptation.

MM-MRE: a new technique to quantify individual muscle forces during isometric tasks of the wrist using MR elastography

MM-MRE quantifies individual muscle forces during wrist isometric tasks using MR elastography and joint torque measurements, demonstrating sensitivity to changes in muscle mechanics.

Single-stride exposure to pulse torque assistance provided by a robotic exoskeleton at the hip and knee joints

The paper applies robotic exoskeleton torque pulses to hip and knee joints during walking to modulate push-off posture and measures effects on propulsive impulse and hip extension.

Training propulsion: Locomotor adaptation to accelerations of the trailing limb

This study introduces a treadmill-based training method to enhance propulsive force generation in stroke survivors by accelerating the trailing limb, resulting in significant increases in propulsive force.

The effect of stride length on lower extremity joint kinetics at various gait speeds

This study examines how gait speed and stride length affect lower extremity joint moments in healthy individuals, identifying localized effects and proposing torque pulse strategies for robotic gait assistance.

The effect of physiological and measurement noise on the estimate of individual muscle force from indirect measurements of muscle activity

This study introduces a novel estimator to improve muscle force estimation from incomplete muscle activity measurements, showing a 25% reduction in mean estimation bias in simulations.

Model-based analysis of the stiffness of the wrist joint in active and passive conditions

This paper develops a computational framework to analyze wrist joint stiffness in active and passive conditions, finding that muscle co-contraction significantly affects stiffness magnitude and orientation.