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Contact

Ivelina Piryankova

Address: Spemannstr. 44
72076 Tübingen
Room number: 1.VR.01
Phone: +49 7071 601 214
Fax: +49 7071 601 616
E-Mail: ivelina.alexandrova

 

Picture of Piryankova, Ivelina

Ivelina Piryankova

Position: PhD Student  Unit: Alumni Bülthoff Bülthoff

 

Research group: Space and Body Perception Group

Supervisor: Ph. D. Betty Mohler

 

I am a PhD student in Max-Planck-Institute for Biological Cybernetics. My research concentrates mostly on perception in immersive virtual environments (VEs) and more specifically space perception and body perception. People perceive the virtual world in a different way than they perceive the real world. Understanding the reasons underlying this effect will help us use the VEs more efficiently for different purposes, such as training, prototyping, education, basic science questions, interactive storytelling or rehabilitation.

 

 

In my final project as a PhD student I investigate women's sensitivity to changes in their perceived weight by altering the body mass index (BMI) of the participants' personalized avatars displayed on a large-screen immersive display. The work on this project is done in collaboration with scientists from University of Utah (Ph. D. Jeanine K. Stefanucci) and Max Planck Institute for Intelligent Systems (Dr. Javier Romero and Prof. Dr. Michael J. Black).

 

My previous projects:

  • Body perception in VEs, in which we were interested in gaining more insights of how does visual embodiment affect perception and action. This work was part of a tandem project in collaboration with Philosophers (Dr. Hong Yu Wong and Catherine Stinson) from the Centre for Integrative Neuroscience (CIN) Tübingen.
  • Egocentric distance perception, in which we investigate the difference between distance perception in the VEs compared to the real world. For this study we use a 3D replication of a real-world room. I modeled the 3D model as I joined MPI for a six-weeks internship. More information about this project you can find in our paper published at APGV 2010.
  • Animation of medical training scenarios – the aim of this project is to increase the effectiveness of medical training simulations by helping trainees gain a better understanding of the importance of communication and teamwork. Therefore we are developing an on-line application, which enables trainees to view the scenario from different perspectives or to freely explore the environment perception (you can see an example of this work here). Thus we can study the impact of the different perspectives on the users’ perception. The results of these studies can be used to improve the effectiveness of training. We created a pipeline for rapid and realistic reconstruction of medical scenarios, involving realistic virtual humans with realistic motions and ability to express emotions. We tested their ability to convey specific emotions in a user study published in JVRC 2010, which won "Best Short Paper Award". Further we tested and improved our pipeline in a paper published at CASA 2011 and in a paper will appear in MMVR 2012.

Using realistic virtual reality to influence space and body perception

Ivelina Piryankova, Betty Mohler


Introduction

Immersive virtual environments (VEs) have great potential as interactive mediums for a variety of applications. The users of VE applications are often represented by avatars in virtual reality (VR). This does not necessarily mean that the person represented by the avatar in VR immediately embodies the avatar. However, for many VR applications to be effective, people need to identify themselves with their self-representing avatar and feel ownership over its virtual body.

 

Goals

The goal of this research is to investigate whether virtual reality can be used to impact perception of own body size and the surrounding virtual world.

 

Methods

We used body ownership illusion to investigate the conditions required for embodying a virtual avatar and introduce novel measures (body size and affordances) to assess embodiment of a virtual avatar [1]. Further, we investigate women's sensitivity to changes in their perceived weight by altering the body mass index (BMI) of the participants' personalized avatars displayed on a large-screen immersive display [2, 3].

 

 

References

1.      Ivelina V. Piryankova, Hong Yu Wong, Sally A. Linkenauger, Catherine Stinson, Matthew R. Longo, Heinrich H. Bülthoff, Betty J. Mohler (2014) Owning an overweight or underweight body: distinguishing the physical, the experienced and the virtual body, PLoS ONE (accepted)

2.      Ivelina V. Piryankova, Jeanine K. Stefanucci, Javier  Romero, Stephan  de la Rosa, Michael J. Black and Betty J. Mohler (2014) Can I recognize my body’s weight? The influence of shape and texture on the perception of self, ACM TAP (accepted)

3.      Ivelina V. Piryankova, Stephan de la Rosa, Uwe Kloos, Heinrich H. Bülthoff, Betty J. Mohler (2013) Egocentric distance perception in large screen immersive displays, Displays, Volume 34 (2) 153-164.

 


Medical Training Using Perspective Taking in Virtual Reality

Ivelina Piryankova, Betty Mohler, Heinrich H. Bülthoff

 

Introduction

The aim of this work is to increase the effectiveness of medical training simulations by helping trainees gain a better understanding of the importance of communication and teamwork. Therefore we develop an application that can be used together with Real World (RW) simulations to improve training. Our application allows students to take the perspective of their teammates or the patient, while observing realistically reconstructed medical scenarios in a Virtual Environment (VE).

Goals

Our goal is to develop a virtual (on-line or immersive VE) application that can be used as an additional tool to the RW simulations for effective medical training at the university hospital. Therefore we first establish a pipeline to rapidly and realistically generate animations of medical scenarios.

Methods

We developed a pipeline which combines body animations extracted from full body motion capture data and facial animations using predefined meshes of facial expressions ([1], [2], [3] - JVRC best short paper). We used audio recordings from the RW scenario to synchronize the lip motions with the sound and video recordings to synchronize the motions of the virtual humans and to set up the VE scene.

Initial results

Using our pipeline we captured a routine medical scenario with students [2] and a didactical medical scenario with practitioners [1]. The latter was used for improving the pipeline. The two medical scenarios were further used for generating an interactive online application [1].

Initial conclusion

Our application can be used as an additional tool to medical simulations to give students the possibility to observe and analyze their performance by taking the perspective of their teammates or the patient. Furthermore we intend to gather feedback from medical professionals and students for the usability of the interface of the application.

References

1.Alexandrova IV , Rall M , Breidt M , Kloos U , Tullius G , Bülthoff HH and Mohler BJ (2011) Enhancing Medical Communication Training Using Motion Capture,

Perspective Taking and Virtual Reality, 19th MMVR, (to appear Feb. 2011).

2.Alexandrova IV , Rall M , Breidt M , Kloos U , Tullius G , Bülthoff HH and Mohler BJ (2011) Animations of Medical Training Scenarios in Immersive Virtual Environments, 24th CASA 2011, 1-4.

3.Alexandrova IV , Volkova EP , Kloos U , Bülthoff HH and Mohler BJ (2010) Virtual Storyteller in Immersive Virtual Environments Using Fairy Tales Annotated for Emotion States, JVRC 2010, 65-68.(Best short paper award)

4. Alexandrova IV , Teneva PT , de la Rosa S , Kloos U , Bülthoff HH and Mohler BJ (2010) Egocentric distance judgments in a large screen display immersive virtual environment, 7th APGV 2010, ACM Press, New York, NY, USA, 57-60.

 

Other project in which I was involved as a research assistant:

  • The EU-sponsored project "POETICON" (with Christian Wallraven, as a local coordinator), in which I have modeled the 3D models and helped editing some motion capture data used in the kitchen scenarios.
  • Face Project of Isabelle Bülthoff. I have helped setting up the virtual humans used for the experiment and I have modeled the room in which the virtual humans are located.
  • Ekaterina Volkova's experiment for emotion perception with an amateur actor. I have helped animating a virtual character with the amateur actors’ motions.

IVELINA VESSELINOVA PIRYANKOVA

 

RESEARCH INTERESTS


Body and space perception in real-time virtual environments; real-time simulations, training, therapy and rehabilitation; modeling of realistic real-time virtual environments; generating realistically animated virtual humans in real-time virtual environments.

 

EDUCATION


M. Sc, 2011 Reutlingen University

Media and Communication Informatics

Thesis title: “Generating Virtual Humans Using Predefined Bodily and Facial Emotions in Real-Time Immersive Virtual Environments”

 

B.A., 2006 Eberhard Karls University Tübingen

Computational Linguistics

Thesis title: “LTAG Semantics for Relative Clause”

 

High School Diploma, 2003 “Academician Kiril Popov” High School of Mathematics, Plovdiv, Bulgaria

Major: Physics, English, Computer Technologies and Programming

 

 

 

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Articles (2):

Piryankova IV Person, Wong HY , Linkenauger SA Person, Stinson C Person, Longo MR , Bülthoff HH Person and Mohler BJ Person (August-2014) Owning an Overweight or Underweight Body: Distinguishing the Physical, Experienced and Virtual Body PLoS ONE 9(8) 1-13.
Piryankova IV Person, de la Rosa S Person, Kloos U , Bülthoff HH Person and Mohler BJ Person (April-2013) Egocentric distance perception in large screen immersive displays Displays 34(2) 153–164.

Conference papers (5):

Piryankova IV Person, Stefanucci JK Person, Romero J Person, de la Rosa S Person, Black MJ Person and Mohler BJ Person (July-2014) Can I recognize my body's weight? The influence of shape and texture on the perception of self ACM Symposium on Applied Perception (SAP '14), ACM Press, New York, NY, USA, -.
Alexandrova IV Person, Rall M , Breidt M Person, Tullius G , Kloos C , Bülthoff HH Person and Mohler BJ Person (February-2012) Enhancing Medical Communication Training Using Motion Capture, Perspective Taking and Virtual Reality In: Medicine Meets Virtual Reality 19: NextMed, 19th Medicine Meets Virtual Reality Conference (MMVR 2012), IOS Press, Amsterdam, Netherlands, 16-22.
pdf
Alexandrova IV Person, Rall M , Breidt M Person, Kloos U , Tullius G , Bülthoff HH Person and Mohler BJ Person (May-2011) Animations of Medical Training Scenarios in Immersive Virtual Environments 2011 Workshop on Digital Media and Digital Content Management (DMDCM), IEEE, Piscataway, NJ, USA, 9-12.
pdf
Alexandrova IV Person, Volkova EP Person, Kloos U , Bülthoff HH Person and Mohler BJ Person (October-2010) Virtual Storyteller in Immersive Virtual Environments Using Fairy Tales Annotated for Emotion States In: Virtual Environments 2010, 2010 Joint Virtual Reality Conference of EuroVR - EGVE - VEC (JVRC 2010), Eurographics Association, Goslar, Germany, 65-68.
pdf
Alexandrova IV Person, Teneva PT Person, de la Rosa S Person, Kloos U , Bülthoff HH Person and Mohler BJ Person (July-2010) Egocentric distance judgments in a large screen display immersive virtual environment 7th Symposium on Applied Perception in Graphics and Visualization (APGV 2010), ACM Press, New York, NY, USA, 57-60.
pdf

Posters (5):

Volkova E Person, Mohler B Person, Linkenauger S Person, Alexandrova I Person and Bülthoff HH Person (October-2011): Contribution of Prosody in Audio-visual Integration to Emotional Perception of Virtual Characters, 12th International Multisensory Research Forum (IMRF 2011), Fukuoka, Japan, i-Perception, 2(8) 774.
Volkova E Person, Linkenauger S Person, Alexandrova I Person, Bülthoff HH Person and Mohler B Person (September-2011): Integration of Visual and Auditory Stimuli in the Perception of Emotional Expression in Virtual Characters, 34th European Conference on Visual Perception, Toulouse, France, Perception, 40(ECVP Abstract Supplement) 138.
Wallraven C Person, Schultze M Person, Mohler B Person, Volkova E Person, Alexandrova I Person, Vatakis A Person and Pastra K (September-2010): Understanding Objects and Actions: a VR Experiment, 2010 Joint Virtual Reality Conference of EuroVR - EGVE - VEC (JVRC 2010), Stuttgart, Germany.
pdf
Alexandrova IV Person, Teneva PT Person, Kloos U , Bülthoff HH Person and Mohler BJ Person (August-2010): Egocentric distance judgments in a large-screen immersive display virtual environment, 33rd European Conference on Visual Perception, Lausanne, Switzerland, Perception, 39(ECVP Abstract Supplement) 51.
pdf
Volkova EP Person, Alexandrova IV Person, Bülthoff HH Person and Mohler BJ Person (August-2010): Virtual storytelling of fairy tales: Towards simulation of emotional perception of text, 33rd European Conference on Visual Perception, Lausanne, Switzerland, Perception, 39(ECVP Abstract Supplement) 31.

Theses (1):

Alexandrova IV Person: Generating Virtual Humans Using Predefined Bodily and Facial Emotions in Real-Time Immersive Virtual Environments, Reutlingen University, (January-17-2011). Master thesis
pdf

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Last updated: Friday, 17.01.2014