Christoph Guger - Academia.edu (original) (raw)
Papers by Christoph Guger
Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2011
A home is smart when, being aware of its own state and that of its users, is capable of controlli... more A home is smart when, being aware of its own state and that of its users, is capable of controlling itself in order to support the user wishes and thus improving their quality of life. This holds both for users with special needs and for those with ordinary domestic needs. In this paper, we overview the Smart Homes for All
Frontiers in Neuroscience, 2011
Brain–computer interfaces (BCI) are using the electroencephalogram, the electrocorticogram and tr... more Brain–computer interfaces (BCI) are using the electroencephalogram, the electrocorticogram and trains of action potentials as inputs to analyze brain activity for communication purposes and/or the control of external devices. Thus far it is not known whether a BCI system can be developed that utilizes the states of brain structures that are situated well below the cortical surface, such as the hippocampus. In order to address this question we used the activity of hippocampal place cells (PCs) to predict the position of an ...
PloS one, Oct 31, 2012
Immersive virtual reality (IVR) typically generates the illusion in participants that they are in... more Immersive virtual reality (IVR) typically generates the illusion in participants that they are in the displayed virtual scene where they can experience and interact in events as if they were really happening. Teleoperator (TO) systems place people at a remote physical destination embodied as a robotic device, and where typically participants have the sensation of being at the destination, with the ability to interact with entities there. In this paper, we show how to combine IVR and TO to allow a new class of application. The participant in the IVR is ...
… in Medicine and …, Aug 30, 2011
A home is smart when, being aware of its own state and that of its users, is capable of controlli... more A home is smart when, being aware of its own state and that of its users, is capable of controlling itself in order to support the user wishes and thus improving their quality of life. This holds both for users with special needs and for those with ordinary domestic needs. In this paper, we overview the Smart Homes for All project which represents the current state of the art with respect to software control and user interfaces in the smart homes arena.
PLoS One, Dec 20, 2006
Background Stanley Milgram's 1960s experimental findings that people would administer appare... more Background Stanley Milgram's 1960s experimental findings that people would administer apparently lethal electric shocks to a stranger at the behest of an authority figure remain critical for understanding obedience. Yet, due to the ethical controversy that his experiments ignited, it is nowadays impossible to carry out direct experimental studies in this area. In the study reported in this paper, we have used a similar paradigm to the one used by Milgram within an immersive virtual environment. Our objective has not been the study of ...
In the past decades, a variety of applications and devices were interfaced with EEG based Brain C... more In the past decades, a variety of applications and devices were interfaced with EEG based Brain Computer Interfaces (BCIs) with the aim to offer assistive technology to severely handi-capped users. Nevertheless, up to now no standardized description of the possible interaction options (i.e. the tasks a user can perform with the aid of the BCI) was available. Each func-tion provided by an application or device connected to the BCI had to be hard–coded. In this contribution, we propose a new platform–independent XML based description of the interac-tion options. The scheme is interpreted by a middleware layer which connects applications and devices to the BCI. In its current version, scheme and middleware layer are designed for a BCI which provides graphical feedback to the user.
Frontiers in systems neuroscience, 2014
A brain-computer-interface (BCI) allows the user to control a device or software with brain activ... more A brain-computer-interface (BCI) allows the user to control a device or software with brain activity. Many BCIs rely on visual stimuli with constant stimulation cycles that elicit steady-state visual evoked potentials (SSVEP) in the electroencephalogram (EEG). This EEG response can be generated with a LED or a computer screen flashing at a constant frequency, and similar EEG activity can be elicited with pseudo-random stimulation sequences on a screen (code-based BCI). Using electrocorticography (ECoG) instead of EEG promises higher spatial and temporal resolution and leads to more dominant evoked potentials due to visual stimulation. This work is focused on BCIs based on visual evoked potentials (VEP) and its capability as a continuous control interface for augmentation of video applications. One 35 year old female subject with implanted subdural grids participated in the study. The task was to select one out of four visual targets, while each was flickering with a code sequence. A...
World neurosurgery, 2014
Electrocortical stimulation (ECS) is the gold standard for functional brain mapping during an awa... more Electrocortical stimulation (ECS) is the gold standard for functional brain mapping during an awake craniotomy. The critical issue is to set aside enough time to identify eloquent cortices by ECS. High gamma activity (HGA) ranging between 80 and 120 Hz on electrocorticogram is assumed to reflect localized cortical processing. In this report, we used real-time HGA mapping and functional neuronavigation integrated with functional magnetic resonance imaging (fMRI) for rapid and reliable identification of motor and language functions. Four patients with intra-axial tumors in their dominant hemisphere underwent preoperative fMRI and lesion resection with an awake craniotomy. All patients showed significant fMRI activation evoked by motor and language tasks. During the craniotomy, we recorded electrocorticogram activity by placing subdural grids directly on the exposed brain surface. Each patient performed motor and language tasks and demonstrated real-time HGA dynamics in hand motor area...
Lecture Notes in Computer Science, 2013
Clinical Neurophysiology, 2014
Frontiers in Neuroengineering, 2014
Presence research heavily relies on empirical experiments involving subjects in mediated environm... more Presence research heavily relies on empirical experiments involving subjects in mediated environments. Such experiments can be extremely resource intensive and produce very large amounts of data. As the presence community matures, we would like to suggest that data collected in experiments will be publicly available to the community. This will allow the verification of experimental results, comparing results of experiments
Neuroscience Letters, 2005
In the Eastern Alps, the Dachstein massif with a height of almost 3000m is an ideal location for ... more In the Eastern Alps, the Dachstein massif with a height of almost 3000m is an ideal location for investigating the effects of changes in altitude on the human body. Within a few minutes, a cable car facilitates an ascent from 1702 to 2700m above sea level, where the partial pressure of oxygen is about 550mmHg (as compared to 760mmHg at
Epilepsy & Behavior, 2010
In October 2009, a group of neurologists, neurosurgeons, computational neuroscientists, and engin... more In October 2009, a group of neurologists, neurosurgeons, computational neuroscientists, and engineers congregated to present novel developments transforming human electrocorticography (ECoG) beyond its established relevance in clinical epileptology. The contents of the proceedings advanced the role of ECoG in seizure detection and prediction, neurobehavioral research, functional mapping, and brain–computer interface technology. The meeting established the foundation for future work on
Brain computer interfaces (Abingdon, England), 2014
The Fifth International Brain-Computer Interface (BCI) Meeting met June 3-7(th), 2013 at the Asil... more The Fifth International Brain-Computer Interface (BCI) Meeting met June 3-7(th), 2013 at the Asilomar Conference Grounds, Pacific Grove, California. The conference included 19 workshops covering topics in brain-computer interface and brain-machine interface research. Topics included translation of BCIs into clinical use, standardization and certification, types of brain activity to use for BCI, recording methods, the effects of plasticity, special interest topics in BCIs applications, and future BCI directions. BCI research is well established and transitioning to practical use to benefit people with physical impairments. At the same time, new applications are being explored, both for people with physical impairments and beyond. Here we provide summaries of each workshop, illustrating the breadth and depth of BCI research and high-lighting important issues for future research and development.
Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2011
A home is smart when, being aware of its own state and that of its users, is capable of controlli... more A home is smart when, being aware of its own state and that of its users, is capable of controlling itself in order to support the user wishes and thus improving their quality of life. This holds both for users with special needs and for those with ordinary domestic needs. In this paper, we overview the Smart Homes for All
Frontiers in Neuroscience, 2011
Brain–computer interfaces (BCI) are using the electroencephalogram, the electrocorticogram and tr... more Brain–computer interfaces (BCI) are using the electroencephalogram, the electrocorticogram and trains of action potentials as inputs to analyze brain activity for communication purposes and/or the control of external devices. Thus far it is not known whether a BCI system can be developed that utilizes the states of brain structures that are situated well below the cortical surface, such as the hippocampus. In order to address this question we used the activity of hippocampal place cells (PCs) to predict the position of an ...
PloS one, Oct 31, 2012
Immersive virtual reality (IVR) typically generates the illusion in participants that they are in... more Immersive virtual reality (IVR) typically generates the illusion in participants that they are in the displayed virtual scene where they can experience and interact in events as if they were really happening. Teleoperator (TO) systems place people at a remote physical destination embodied as a robotic device, and where typically participants have the sensation of being at the destination, with the ability to interact with entities there. In this paper, we show how to combine IVR and TO to allow a new class of application. The participant in the IVR is ...
… in Medicine and …, Aug 30, 2011
A home is smart when, being aware of its own state and that of its users, is capable of controlli... more A home is smart when, being aware of its own state and that of its users, is capable of controlling itself in order to support the user wishes and thus improving their quality of life. This holds both for users with special needs and for those with ordinary domestic needs. In this paper, we overview the Smart Homes for All project which represents the current state of the art with respect to software control and user interfaces in the smart homes arena.
PLoS One, Dec 20, 2006
Background Stanley Milgram's 1960s experimental findings that people would administer appare... more Background Stanley Milgram's 1960s experimental findings that people would administer apparently lethal electric shocks to a stranger at the behest of an authority figure remain critical for understanding obedience. Yet, due to the ethical controversy that his experiments ignited, it is nowadays impossible to carry out direct experimental studies in this area. In the study reported in this paper, we have used a similar paradigm to the one used by Milgram within an immersive virtual environment. Our objective has not been the study of ...
In the past decades, a variety of applications and devices were interfaced with EEG based Brain C... more In the past decades, a variety of applications and devices were interfaced with EEG based Brain Computer Interfaces (BCIs) with the aim to offer assistive technology to severely handi-capped users. Nevertheless, up to now no standardized description of the possible interaction options (i.e. the tasks a user can perform with the aid of the BCI) was available. Each func-tion provided by an application or device connected to the BCI had to be hard–coded. In this contribution, we propose a new platform–independent XML based description of the interac-tion options. The scheme is interpreted by a middleware layer which connects applications and devices to the BCI. In its current version, scheme and middleware layer are designed for a BCI which provides graphical feedback to the user.
Frontiers in systems neuroscience, 2014
A brain-computer-interface (BCI) allows the user to control a device or software with brain activ... more A brain-computer-interface (BCI) allows the user to control a device or software with brain activity. Many BCIs rely on visual stimuli with constant stimulation cycles that elicit steady-state visual evoked potentials (SSVEP) in the electroencephalogram (EEG). This EEG response can be generated with a LED or a computer screen flashing at a constant frequency, and similar EEG activity can be elicited with pseudo-random stimulation sequences on a screen (code-based BCI). Using electrocorticography (ECoG) instead of EEG promises higher spatial and temporal resolution and leads to more dominant evoked potentials due to visual stimulation. This work is focused on BCIs based on visual evoked potentials (VEP) and its capability as a continuous control interface for augmentation of video applications. One 35 year old female subject with implanted subdural grids participated in the study. The task was to select one out of four visual targets, while each was flickering with a code sequence. A...
World neurosurgery, 2014
Electrocortical stimulation (ECS) is the gold standard for functional brain mapping during an awa... more Electrocortical stimulation (ECS) is the gold standard for functional brain mapping during an awake craniotomy. The critical issue is to set aside enough time to identify eloquent cortices by ECS. High gamma activity (HGA) ranging between 80 and 120 Hz on electrocorticogram is assumed to reflect localized cortical processing. In this report, we used real-time HGA mapping and functional neuronavigation integrated with functional magnetic resonance imaging (fMRI) for rapid and reliable identification of motor and language functions. Four patients with intra-axial tumors in their dominant hemisphere underwent preoperative fMRI and lesion resection with an awake craniotomy. All patients showed significant fMRI activation evoked by motor and language tasks. During the craniotomy, we recorded electrocorticogram activity by placing subdural grids directly on the exposed brain surface. Each patient performed motor and language tasks and demonstrated real-time HGA dynamics in hand motor area...
Lecture Notes in Computer Science, 2013
Clinical Neurophysiology, 2014
Frontiers in Neuroengineering, 2014
Presence research heavily relies on empirical experiments involving subjects in mediated environm... more Presence research heavily relies on empirical experiments involving subjects in mediated environments. Such experiments can be extremely resource intensive and produce very large amounts of data. As the presence community matures, we would like to suggest that data collected in experiments will be publicly available to the community. This will allow the verification of experimental results, comparing results of experiments
Neuroscience Letters, 2005
In the Eastern Alps, the Dachstein massif with a height of almost 3000m is an ideal location for ... more In the Eastern Alps, the Dachstein massif with a height of almost 3000m is an ideal location for investigating the effects of changes in altitude on the human body. Within a few minutes, a cable car facilitates an ascent from 1702 to 2700m above sea level, where the partial pressure of oxygen is about 550mmHg (as compared to 760mmHg at
Epilepsy & Behavior, 2010
In October 2009, a group of neurologists, neurosurgeons, computational neuroscientists, and engin... more In October 2009, a group of neurologists, neurosurgeons, computational neuroscientists, and engineers congregated to present novel developments transforming human electrocorticography (ECoG) beyond its established relevance in clinical epileptology. The contents of the proceedings advanced the role of ECoG in seizure detection and prediction, neurobehavioral research, functional mapping, and brain–computer interface technology. The meeting established the foundation for future work on
Brain computer interfaces (Abingdon, England), 2014
The Fifth International Brain-Computer Interface (BCI) Meeting met June 3-7(th), 2013 at the Asil... more The Fifth International Brain-Computer Interface (BCI) Meeting met June 3-7(th), 2013 at the Asilomar Conference Grounds, Pacific Grove, California. The conference included 19 workshops covering topics in brain-computer interface and brain-machine interface research. Topics included translation of BCIs into clinical use, standardization and certification, types of brain activity to use for BCI, recording methods, the effects of plasticity, special interest topics in BCIs applications, and future BCI directions. BCI research is well established and transitioning to practical use to benefit people with physical impairments. At the same time, new applications are being explored, both for people with physical impairments and beyond. Here we provide summaries of each workshop, illustrating the breadth and depth of BCI research and high-lighting important issues for future research and development.