Kontakt

Alessandro Nesti

Adresse: Spemannstr. 41
72076 Tübingen
Raum Nummer: 2.B.03
Tel.: 07071 601 642
E-Mail: Alessandro.Nesti

 

Bild von Nesti, Alessandro

Alessandro Nesti

Position: Wissenschaftler  Abteilung: Bülthoff

Motion Perception and Simulation

I am a Postdoc with background in biomedical engineering and neuroscience. I currently work in the Motion Perception and Simulation research group and I contributed to the project Wahrnehmungsbasierte Bewegungssimulation (WABS). My research interest is in how humans perceive their own self-motion in everyday life and in using this knowledge to investigate and optimize techniques to perceptually expand the limited physical workspace of dynamic vehicles simulators (Motion Cueing).

 

1. HUMAN DISCRIMINATION OF SELF-MOTION

To successfully perform daily activities such as maintaining posture or running, humans need to be sensitive to self-motion over a large range of motion intensities. How the intensity of the motion stimuli affects self-motion perception is an open, yet important, question. We conducted an experimental campaign to investigate how the human ability to discriminate self-motion depends on motion intensity for upward and downward translations in darkness and for horizontal head-centred rotations in presence of visual-only, inertial-only and visual-inertial motion stimuli. We found that differential thresholds, i.e. the smallest detectable change in stimulus intensity, increase with stimulus intensity following a trend well-described by a power function [1,2]. Moreover, combining visual and inertial stimuli does not lead to improved self-motion sensitivity over the investigated range of yaw rotations. We further observed that the time necessary for a visual-only stimulus to evoke a compelling self-motion illusion is independent from stimulus intensity and facilitated by recent exposure [2].

 

 

Differential thresholds for head centered yaw rotations

Figure: Differential thresholds for head centered yaw rotations.

 

 

2. VARIABLE ROLL-RATE PERCEPTION IN DRIVING SIMULATION

Inside of the cabin of the MPI CyberMotion Simulator. In a driving experiment, the driver steers a virtual car through a curve using a forcefeedback steering wheel.


In driving simulation, simulator tilt is used to reproduce linear acceleration. In order to feel realistic, this tilt is performed at a rate below the tilt-rate detection threshold, which is usually assumed constant. However, it is known that many factors affect the threshold, like visual information, simulator motion in additional directions, or active vehicle control. We investigated the effect of these factors on roll-rate detection threshold during simulated curve driving [3]. Results showed that roll-rate perception in vehicle simulation is affected by the presence of motion in additional directions. Moreover, an active control task seems to increase the detection threshold, i.e. impair motion sensitivity, but with large individual differences. We hypothesize that this is related to the level of immersion during the task.

 

Figure: Inside of the cabin of the MPI CyberMotion Simulator. In a driving experiment, the driver steers a virtual car through a curve using a forcefeedback steering wheel.

 

 

 

 

3. WABS: PERCEPTION-BASED MOTION SIMULATION


Within the project WABS ("Wahrnehmungsbasierte Bewegungssimulation") we developed an alternative approach to motion cueing. Motion cueing is the process of converting a desired physical motion (e.g. from a vehicle model) into commands that are sent to the motion simulator. This conversion is done by a so-called Motion Cueing Algorithm (MCA).The WABS project is based on the idea that motion cueing can be improved by including novel insights in human self-motion perception, obtained from fundamental motion perception studies, in the MCAs. This "perception-based motion cueing" approach allows for exploiting the limitations and ambiguities of the human perceptual system.

More about WABS

 

 

 


4. SETUP OF THE MOTION-LAB

To expand our simulator fleet, we are currently working on the hardware and software implementation of a new motion simulator consisting of a hexapod motion system and a simulator cabin. Inside the cabin, participants have the possibility of using control devices (e.g. steering wheel) and experiencing a virtual environment.

 

 

 

 

References

  1. Nesti A, Barnett-Cowan M, Macneilage PR, Bülthoff HH (2014) Human sensitivity to vertical self-motion. Exp Brain Res 232: 303–31
  2. Nesti, A., Beykirch, K., Pretto, P., & Bülthoff, H. (n.d.). Human self-motion sensitivity to visual yaw rotations. In Journal of Vision; Motion Perception: Local motion and optic flow (p. 14(10): 485). doi:doi:10.1167/14.10.485
  3. Nesti A, Masone C, Barnett-Cowan M, Giordano PR, Bülthoff HH, Pretto P (2012) Roll rate thresholds and perceived realism in driving simulation. Driving simulation conference

 

Education

  • 02/2011 - now: PhD in Neuroscience at the "Max Planck Institute for Biological Cybernetics" - Spemannstrase 41 - 72076 Tübingen, Germany
  • 10/2003 - 04/2010: Master’s degree in biomedical engineering at "Università degli Studi di Pavia" - Via Ferrata, 1 - 27100 Pavia - Italy
  • 07/2003: European Baccalaureat at the "European School of Varese" - Italy

 

Professional experience

  • 02/2011 - now: Research activity for my PhD project on the human perception of self-motion at Max Planck Institute for Biological Cybernetics with Professor Heinrich H Bülthoff, Spemannstrasse 38 – 72076 Tübingen, Germany
  • 11/2011 - 11/2013: Technical support and research activity within a VIP project on perception-based motion simulation at Max Planck Institute for Biological Cybernetics with Professor Heinrich H Bülthoff, Spemannstrasse 38 – 72076 Tübingen, Germany
  • 10/2009 - 04/2010: Development of Hardware and Software for the diagnosis of the Ocular Tilt Reaction syndrome at Bioengeneering Laboratory with Professor Giorgio Beltrami - Via Ferrata 1 - 27100 Pavia
  • 09/2006 - 07/2007: Development of Hardware and Software for rehabilitation of vestibular disorders at Bioengeneering Laboratory with Professor Giorgio Beltrami - Via Ferrata 1 - 27100 Pavia

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Artikel (4):

Nesti A Person, Beykirch KA Person, Pretto P Person und Bülthoff HH Person (März-2015) Self-motion sensitivity to visual yaw rotations in humans Experimental Brain Research 233(3) 861-869.
Nesti A Person, Beykirch KA Person, MacNeilage PR Person, Barnett-Cowan M Person und Bülthoff HH Person (April-2014) The importance of stimulus noise analysis for self-motion studies PLoS ONE 9(4) 1-8.
Nesti A Person, Barnett-Cowan M Person, MacNeilage PR Person und Bülthoff HH Person (Januar-2014) Human sensitivity to vertical self-motion Experimental Brain Research 232(1) 303-314.
Ramat S , Nesti A Person, Versino M , Colnaghi S , Magnaghi C , Bianchi A und Beltrami G (September-2011) A new device to assess static ocular torsion Annals of the New York Academy of Sciences 1233 226-230.

Beiträge zu Tagungsbänden (2):

Pretto P Person, Nesti A Person, Nooij S Person, Losert M Person und Bülthoff HH Person (September-2014) Variable Roll-rate Perception in Driving Simulation In: New Experiments in Driving Simulation Design and Experiments, Driving Simulation Conference (DSC 2014), Institut National de Recherche sur les Transports et Leur Sécurité, Arcueil, France, 40.1-40.7.
pdf
Nesti A Person, Masone C Person, Barnett-Cowan M Person, Robuffo Giordano P Person, Bülthoff HH Person und Pretto P Person (September-2012) Roll rate thresholds and perceived realism in driving simulation Driving Simulation Conference Europe (DSC 2012), INRETS, Bron, France, 1-6.
pdf

Poster (8):

Nooij S Person, Pretto P Person, Bülthoff HH Person und Nesti A Person (Juni-13-2014): Nonveridical perception of heading and travelled path during curved trajectories, 15th International Multisensory Research Forum (IMRF 2014), Amsterdam, The Netherlands.
Nesti A Person, Beykirch K Person, Pretto P Person und Bülthoff HH Person (Mai-18-2014): Human self-motion sensitivity to visual yaw rotations, 14th Annual Meeting of the Vision Sciences Society (VSS 2014), St. Pete Beach, FL, USA, Journal of Vision, 14(10) 485.
Pretto P Person, Nesti A Person, Nooij S Person, Losert M Person und Bülthoff HH Person (Mai-17-2014): Tilt-rate perception in vehicle simulation: the role of motion, vision and attention, 14th Annual Meeting of the Vision Sciences Society (VSS 2014), St. Pete Beach, FL, USA, Journal of Vision, 14(10) 279.
Nesti A Person, Beykirch KA Person, Pretto P Person und Bülthoff HH Person (April-2014): Human sensitivity to visual-inertial self-motion, 24th Annual Meeting of the Society for the Neural Control of Movements (NCM 2014), Amsterdam, The Netherlands.
Nooij S Person, Pretto P Person, Nesti A Person und Bülthoff HH Person (April-2014): Perception of heading and travelled path during curvilinear trajectories, 24th Annual Meeting of the Society for the Neural Control of Movements (NCM 2014), Amsterdam, The Netherlands.
Nesti A Person, Beykirch K Person, Pretto P Person und Bülthoff HH Person (November-2012): Human sensitivity to different motion intensities, 13th Conference of the Junior Neuroscientists of Tübingen (NeNA 2012), Schramberg, Germany.
Nesti A Person, Barnett-Cowan M Person, Bülthoff HH Person und Pretto P Person (Juni-21-2012): Roll rate thresholds in driving simulation, 13th International Multisensory Research Forum (IMRF 2012), Oxford, UK, Seeing and Perceiving, 25(0) 167.
Nesti A Person, Barnett-Cowan M Person, MacNeilage P Person und Bülthoff HH Person (Januar-2012): Differential Thresholds for Vertical Motion, 22nd Okulomotoriktreffen Zürich-München (ZüMü 2012), Zürich, Switzerland.

Vorträge (1):

Nesti A Person und Beltrami G (September-24-2011): Instrumentation for the evaluation of the centro-cecal axis rotation to assess static ocular torsion, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.

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Last updated: Dienstag, 18.11.2014