Publications by Roger Gassert | EPFL Graph Search

Anatomical and functional properties of the foot and leg representation in areas 3b, 1 and 2 of primary somatosensory cortex in humans: A 7T fMRI study

Roger Gassert, Roberto Martuzzi, Olaf Blanke, Michel Akselrod, Wietske Van der Zwaag, Andrea Serino

Primary somatosensory cortex (S1) processes somatosensory information and is composed of multiple subregions. In particular, tactile information from the skin is encoded in three subregions, namely Brodmann areas (BAs) 3b, 1 and 2, with each area represent ...

2017

Improvement in precision grip force control with self-modulation of primary motor cortex during motor imagery

Roger Gassert, Maria Laura Blefari

Motor imagery (MI) has shown effectiveness in enhancing motor performance. This may be due to the common neural mechanisms underlying MI and motor execution (ME). The main region of the ME network, the primary motor cortex (M1), has been consistently linke ...

Frontiers Research Foundation2015

Full body illusion is associated with widespread skin temperature reduction

Roger Gassert, Olaf Blanke, Christian Pfeiffer, Roy Salomon, Mei Ling Melanie Lim

A central feature of our consciousness is the experience of the self as a unified entity residing in a physical body, termed bodily self-consciousness. This phenomenon includes aspects such as the sense of owning a body (also known as body ownership) and h ...

Frontiers Research Foundation2013

Tactile Feedback Improves Performance in a Palpation Task: Results in a VR-Based Testbed

Hannes Bleuler, Roger Gassert, Kaspar Leuenberger, Evren Samur, Laura Santos Carreras

Robotic surgery provides many benefits such as reduced invasiveness and increased dexterity. This comes at the cost of no direct contact between surgeon and patient This physical separation prevents surgeons from performing direct haptic exploration of tis ...

Mit Press2012

Neuroscience robotics to investigate multisensory integration and bodily awareness

Roger Gassert, Dominique Chapuis, Roberto Martuzzi, Olaf Blanke, Silvio Ionta, Christian Pfeiffer, Julio Duenas

Humans experience the self as localized within their body. This aspect of bodily self-consciousness can be experimentally manipulated by exposing individuals to conflicting multisensory input, or can be abnormal following focal brain injury. Recent technol ...

2012

Multi-Sensory and Sensorimotor Foundation of Bodily Self-Consciousness – An Interdisciplinary Approach

Roger Gassert, Olaf Blanke, Silvio Ionta

Frontiers Media2011

Survey on Surgical Instrument Handle Design: Ergonomics and Acceptance

Hannes Bleuler, Roger Gassert, Laura Santos Carreras

Minimally invasive surgical approaches have revolutionized surgical care and considerably improved surgical outcomes. The instrumentation has changed significantly from open to laparoscopic and robotic surgery with various usability and ergonomics qualitie ...

2011

Thick-film multi-DOF force / torque sensor for wrist rehabilitation

Thomas Maeder, Roger Gassert, Olivier Lambercy, Caroline Jacq, Barthélémy Lüthi

A complete six degree of freedom (6 DOF) force/torque sensor has been designed and fabricated, adapted to wrist rehabilitation applications, with the focus laid on simple, straightforward manufacturing processes. This paper details the mechanical design, 3 ...

Elsevier2010

Augmented White Cane with Multimodal Haptic Feedback

Hannes Bleuler, Roger Gassert, Dominique Chapuis, Simon Gallo, Laura Santos Carreras

This paper proposes an instrumented handle with multimodal augmented haptic feedback, which can be integrated into a conventional white cane to extend the haptic exploration range of visually impaired users. The information extracted from the environment t ...

IEEE2010

Virtual Environment to Evaluate Multimodal Feedback Strategies for Augmented Navigation of the Visually Impaired

Hannes Bleuler, Roger Gassert, Solaiman Shokur, Masayuki Hara

This paper proposes a novel experimental environ- ment to evaluate multimodal feedback strategies for augmented navigation of the visually impaired. The environment consists of virtual obstacles and walls, an optical tracking system and a simple device wit ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

Haptic/VR Assessment Tool for Fine Motor Control

Hannes Bleuler, Roger Gassert, Olivier Lambercy, Evren Samur, Christophe Emery

The Nine Hole Peg Test (NHPT) is routinely used in clinical environments to evaluate a patient’s fine hand control. A physician measures the total time required to insert nine pegs into nine holes and obtains information on the dexterity of the patient. Ev ...

Springer Berlin / Heidelberg2010

Design and Psychophysical Evaluation of a Tactile Pulse Display for Teleoperated Artery Palpation

Hannes Bleuler, Roger Gassert, Philippe Rétornaz, Kaspar Leuenberger, Laura Santos Carreras

During traditional open procedures, surgeons directly palpate tissues before dissecting them. In this way, they can avoid the accidental damage of hidden arteries that can lead to fatal hemorrhage. New Minimally Invasive Surgical (MIS) techniques progressi ...

IEEE2010

Influence of force and torque feedback on operator performance in a VR-based suturing task

Hannes Bleuler, Roger Gassert, Ricardo Daniel Rita Beira, Laura Santos Carreras, Ali Sengül

The introduction of Minimally Invasive Surgery (MIS) has revolutionised surgical care, considerably improving the quality of many surgical procedures. Technological advances, particularly in robotic surgery systems, have reduced the complexity of such an a ...

Taylor & Francis2010

Thick-film multi-DOF force / torque sensor for wrist rehabilitation

Thomas Maeder, Roger Gassert, Olivier Lambercy, Caroline Jacq, Barthélémy Lüthi

A complete six–degree-of-freedom (6-DOF) force / torque sensor has been designed and fabricated for wrist rehabilitation applications, with the focus laid on simple, straightforward manufacturing processes. This paper details the mechanical design, 3D-mode ...

Elsevier2009

Development of a 2-DOF Electrostatic Haptic Joystick for MRI/fMRI Applications

Hannes Bleuler, Roger Gassert, Dominique Chapuis

This paper describes the development of a 2-DOF electrostatic haptic joystick designed for neuroscience studies in an MRI/fMRI. The joystick is fabricated using non-magnetic materials and actuated by two high-power electrostatic motor units which produce v ...

2009

Supplementary motor area and anterior intraparietal area integrate fine-graded timing and force control during precision grip

Roger Gassert, Dominique Chapuis, Etienne Burdet

We investigated the neuronal processing of the physiologically particularly important precision grip (opposition of index finger and thumb) by the combination of functional magnetic resonance imaging (fMRI) and an MR-compatible haptic interface. Ten health ...

Wiley-Blackwell2009

HandCARE: a cable-actuated rehabilitation system to train hand function after stroke

Thomas Maeder, Roger Gassert, Olivier Lambercy, Ludovic Dovat, Etienne Burdet

We have developed a robotic interface to train hand and ﬁnger function. HandCARE is a Cable-Actuated REhabilitation system, in which each ﬁnger is attached to an instrumented cable loop allowing force control and a predominantly linear displacement. The de ...

Institute of Electrical and Electronics Engineers2008

Sensing clove for brain studies: Design and assessment of its compatibility for fMRI with a robust test

Roger Gassert, Dominique Chapuis

In this paper, we describe a biomimetic-fabric-based sensing glove that can be used to monitor hand posture and gesture. Our device is made of a distributed sensor network of piezoresistive conductive elastomers integrated into an elastic fabric. This solu ...

Institute of Electrical and Electronics Engineers2008

A hybrid ultrasonic motor and electrorheological fluid clutch actuator for force-feedback in MRI/fMRI

Hannes Bleuler, Roger Gassert, Dominique Chapuis, Etienne Burdet

This paper presents a safe, electrically powered MR-compatible actuator with a large range of output impedance, which can be used at the entry of the scanner bore. This actuator is composed of an ultrasonic motor (USM) and a torque-controlled electrorheolo ...

2008

A Haptic Knob with a Hybrid Ultrasonic Motor and Powder Clutch Actuator

Hannes Bleuler, Roger Gassert, Dominique Chapuis, Xavier Michel, Etienne Burdet

In haptics, the forces to be displayed vary widely in terms of magnitude and bandwidth. A single actuator can hardly comply with these requirements. It has thus been proposed to combine electrical motors and passive devices in a hybrid actuator to cover a ...

2007