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Changes in the cortical brain activity due to mental fatigue have to be assessed in task demanding operating environments for the purpose of safety. In this investigation, ten subjects performed a computer-simulated air traffic control (ATC) task, while electroencephalogram (EEG) data were collected. EEG data were decomposed into brain activity related independent components (ICs) using a group-level...
A number of recent studies have successfully demonstrated smart appliances control using brain-computer interface (BCI) as a proof-of-concept. Yet, a fluid and intuitive interface for the actual implementation is still nowhere to be found. As a first step in bringing a BCI system for smart TV control to a reality, this study focuses on isolating factors that should be considered in design. In the...
Body and brain undergo several changes with aging. One of these changes is the loss of neuroplasticity, which leads to the decrease of cognitive abilities. Hence the necessity of stopping or reversing these changes is of utmost importance to contemporary society. In the present work, electroencephalogram (EEG) markers of cognitive decline are sought whilst the subjects perform the Wisconsin Card Sorting...
Successful auditory stream segregation depends on correctly inhibiting irrelevant stimuli being perceived in parallel with relevant information. Here, we analyze the behavioral correlates of inhibitory processing in healthy subjects, by first calculating the percentage of inhibition elicited through a paired-chirp auditory stimulation paradigm and then analyzing its correlation to the score in a speech...
Low frequency neural oscillations in animals have been shown to play an important role in spatial navigation. However, such studies in humans have remained largely unexplored. We recorded electroencephalogy (EEG) and full body movement as subjects (n=4) walked at two different speeds (slow and fast) in a 4m×4m square spiral track. We then projected subjects' moment-to-moment EEG onto their spatial...
The medium spiny neurons of the ventral medial and dorsolateral striatum play different roles in the basal ganglia. Certain differences stem from distinct NMDA receptor behaviors. To demonstrate these differences NMDA receptor time constants were adapted in our striatal medium spiny neuron model. The respective parameter values were set at published ventromedial and derived dorsolateral striatal values...
This study provides a description of the properties of the intramuscular electromyogram (imEMG) after targeted muscle reinnervation (TMR) surgery, and a preliminary comparison of pattern recognition myoelectric prosthesis control between surface EMG (sEMG) and imEMG in TMR muscle. Fine wire imEMG and sEMG were simultaneously recorded from reinnervated sites in 5 subjects who had TMR surgery. Subjects...
Neurons integrating sensory stimulus features are found in many brain areas up to cortical level, and their understanding is essential for building and improving neural prostheses. Here, we focus on auditory neural coding in the inferior colliculus (IC). Much work has been conducted to identify the primary spectro-temporal sound features. However, a description of how reliable these features are encoded...
Spinal cord stimulation (SCS) is an established treatment for chronic pain. However, SCS only provides 50% or greater pain relief to approximately 60% of patients, and the efficacy of SCS tends to decline over time. Efforts to optimize SCS have focused on the spatial aspects of SCS such as electrode design and electrode geometry while neglecting stimulation parameter selection and have assumed that...
In this paper, we summarize a novel approach to robotic rehabilitation that capitalizes on the benefits of patient intent and real-time assessment of impairment. Specifically, an upper-limb, physical human-robot interface (the MAHI EXO-II robotic exoskeleton) is augmented with a non-invasive brain-machine interface (BMI) to include the patient in the control loop, thereby making the therapy ‘active’...
Anatomical and physiological evidence showing reciprocal connectivity between the hippocampus and Entorhinal Cortex, suggest that in tandem, they function as a closed-loop system. Using neuronal data recorded from the rodent hippocampal regions CA3 and CA1, we construct two open-loop input-output nonlinear dynamical models of the neural signal transformations from CA3 to CA1 and CA1 to CA3, and subsequently...
When afférents reinnervate the muscle tissue nearby a stimulating electrode, it is hard to control how well the single stimulating site of the electrode aligns physically with the location of the nerve fiber. To account for such issues in positioning, a multi-site electrode might aid by delivering electrical stimulation in a distributed fashion. In particular, by sourcing a smaller magnitude of charge...
The Hodgkin-Huxley model describes the dynamics of action potentials and the resultant currents that pass through voltage-dependent ion channels in the neuronal membrane. Another type of ion channels, transmitter-activated ion channels primarily expressed on dendrites, are involved in synaptic transmission from presynaptic neurons. Along these cable-like dendrites, the effect of spatial potential...
Steady-state visual evoked potential (SSVEP)-based brain-computer interfaces (BCIs) have potential to realize a direct communication between the human brain and the outside environment in real-life situations. Recently, we proposed a stimulation approximation approach to increase the number of visual stimuli that can be realized on a computer monitor. In addition to the fundamental and harmonic frequencies,...
The primary effect of light penetration into neural tissue is the heat generated inside the volume as a result of photons being absorbed. The spatio-temporal distribution of the temperature increase in the tissue is not very intuitive since it depends on many parameters including the optical properties of the medium and the thermal time constant that depends on the size of the volume being illuminated...
Inclusion of the prosthesis in the body schema lets the device felt by the user as an extension of the self and consequently improves its performance and acceptability. Two paradigmatic models that faced the issue of the illusory embodiment, the rubber hand illusion and the mirror box, revealed that such process goes in parallel with changes in the activity of cortical sensorimotor areas devoted to...
People regularly show inhibition control in split second under tough situations in daily life. In order to identify the brain process of inhibition control, this study introduced a new methodology to observe brain dynamics in response and success/failure inhibition in typical and realistic scenarios. Subjects will feel stress during decision-making in scenario-compatible stop-signal tasks in bith...
Schizophrenia is a mental disorder that may include delusions, loss of personality, confusion, social withdrawal, psychosis, and bizarre behavior. In this study, we use Electroencephalogram (EEG) signals of the Alpha band to detect the differences between nonlinear EEG features of schizophrenic patients and non-psychiatric controls. EEG signals from 31 schizophrenic patients and 31 age/sex matched...
Blood oxygenation level dependent (BOLD) functional magnetic resonance (fMRI) imaging and functional near infrared spectroscopy (fNIRS) have been widely used to investigate hemodynamic responses to functional stimulation in the human brain. In the present study, we propose a time dependent multi layered Monte Carlo (TD-MCML) simulation approach for mapping brain and scalp tissue absorbance attained...
The tolerance limit for acceptable multimedia quality is changing as more and more high quality services approach the market. Thus, negative emotional reactions towards low quality services may cause user disappointment and are likely to increase churn rate. The current study analyzes how different levels of synthetic speech quality, obtained from different text-to-speech (TTS) systems, affect the...
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