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https://www.readbyqxmd.com/read/28227922/evaluation-of-effects-of-electrical-stimulation-in-the-retina-with-optical-coherence-tomography
#1
A Gonzalez-Calle, J D Weiland, A Gonzalez-Calle, J D Weiland, A Gonzalez-Calle, J D Weiland
Retinal prostheses provide the capability to blind patients to detect motion and locate large objects. To avoid activating axons of passage, which can create streak-like perceptions, long pulse stimulation can be used to bypass axons and achieve focal retinal activation. Safety is a concern because long pulses require more charge than short pulses to elicit a response from neural tissue. Future implants will require smaller electrodes to improve resolution, but increased charge density may result, which is another safety concern...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227916/development-and-pilot-clinical-evaluation-of-a-haptic-based-perception-empathy-biofeedback-device-for-gait-rehabilitation
#2
Kenta Saichi, Kazuhiro Yasuda, Yu Kitaji, Naomi Kaibuki, Hiroyasu Iwata, Kenta Saichi, Kazuhiro Yasuda, Yu Kitaji, Naomi Kaibuki, Hiroyasu Iwata
Recent studies have shown that haptic feedback on the body, either at or away from the desired gait parameter to be changed, can improve gait performance. Here we introduced a haptic-based biofeedback device to supplement the foot pressure information of a paretic foot with a wearable vibrotactile biofeedback device attached to the back. This system provides information regarding a patient's foot pressure pattern to the patient and physical therapist. Therefore, the biofeedback system can share information regarding abnormal gait patterns between patients and therapists...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227849/smartphone-based-real-time-speech-enhancement-for-improving-hearing-aids-speech-perception
#3
Yu Rao, Yiya Hao, Issa M S Panahi, Nasser Kehtarnavaz, Yu Rao, Yiya Hao, Issa M S Panahi, Nasser Kehtarnavaz, Yu Rao, Issa M S Panahi, Yiya Hao, Nasser Kehtarnavaz
In this paper, the development of a speech processing pipeline on smartphones for hearing aid devices (HADs) is presented. This pipeline is used for noise suppression and speech enhancement (SE) to improve speech quality and intelligibility. The proposed method is implemented to run in real-time on Android smartphones. The results of the testing conducted indicate that the proposed method suppresses the noise and improves the perceptual quality of speech in terms of three objective measures of perceptual evaluation of speech quality (PESQ), noise attenuation level (NAL), and the coherent speech intelligibility index (CSD)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227830/an-adaptive-model-approach-for-quantitative-wrist-rigidity-evaluation-during-deep-brain-stimulation-surgery
#4
Sofia Assis, Pedro Costa, Maria Jose Rosas, Rui Vaz, Joao Paulo Silva Cunha, Sofia Assis, Pedro Costa, Maria Jose Rosas, Rui Vaz, Joao Paulo Silva Cunha, Maria Jose Rosas, Joao Paulo Silva Cunha, Sofia Assis, Rui Vaz, Pedro Costa
Intraoperative evaluation of the efficacy of Deep Brain Stimulation includes evaluation of the effect on rigidity. A subjective semi-quantitative scale is used, dependent on the examiner perception and experience. A system was proposed previously, aiming to tackle this subjectivity, using quantitative data and providing real-time feedback of the computed rigidity reduction, hence supporting the physician decision. This system comprised of a gyroscope-based motion sensor in a textile band, placed in the patients hand, which communicated its measurements to a laptop...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227786/a-tunable-digital-ishihara-plate-for-pre-school-aged-children
#5
Orazio Gambino, Ester Minafo, Roberto Pirrone, Edoardo Ardizzone, Orazio Gambino, Ester Minafo, Roberto Pirrone, Edoardo Ardizzone, Ester Minafo, Edoardo Ardizzone, Roberto Pirrone, Orazio Gambino
Colors play a fundamental role for children, both in the everyday life and in education. They recognize the surrounding world, and play games making a large use of colors. They learn letters and numbers by means of colors. As a consequence, early diagnosis of color blindness is an crucial to support an individual affected by this visual perception alteration at the initial phase of his/her life. The diagnosis of red-green color deficiencies (protanopia or deuteranopia) is commonly accomplished by means of the Ishihara test, which consists of plates showing dots with different sizes where some of them compose numbers within a gamut of colors while the ones composing the background have different colors...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227760/cross-frequency-coupling-during-auditory-perception-in-human-cortex
#6
Urszula Malinowska, Dana Boatman-Reich, Urszula Malinowska, Dana Boatman-Reich, Urszula Malinowska, Dana Boatman-Reich
Cross-frequency coupling plays an important role in coordinating neuronal computations underlying human perception, learning and memory. Here we compared four methods for measuring phase/amplitude coupling (PAC) of theta (4-7 Hz) and high-gamma (70-150 Hz) in intracranial electrocorticographic (ECoG) recordings. Time-frequency spectral and time-domain evoked responses were derived for comparison. All four methods showed significant increases in theta/high-gamma PAC in auditory cortex at sites where significant event-related increases in high-gamma power were also observed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227741/eye-movements-as-a-marker-for-visual-prosthesis-spatial-mapping-a-feasibility-study-using-a-blind-patient-implanted-with-the-argus-ii-retinal-prosthesis
#7
Avi Caspi, Jessy Dorn, John B Helder, Kapil D Katyal, Arup Roy, Avi Caspi, Jessy Dorn, John B Helder, Kapil D Katyal, Arup Roy, John B Helder, Kapil D Katyal, Jessy Dorn, Arup Roy, Avi Caspi
Spatial mapping, the location in space of a perceived location due to an implanted electrode's electrical stimulation is important in the design of visual prostheses. Generally, a visual prosthesis system consists of an implanted electrode array, an external camera that acquires the image, and a transmitter that sends the information to the implanted electrodes. In cortical visual implant, the layout of the implanted array in most cases does not match the retinotopic map and it is necessary to find the location of the percept of each electrode in world coordinates...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227566/somatosensory-encoding-with-cuneate-nucleus-microstimulation-detection-of-artificial-stimuli
#8
Srihari Y Sritharan, Andrew G Richardson, Pauline K Weigand, Ivette Planell-Mendez, Xilin Liu, Hongjie Zhu, Milin Zhang, Jan Van der Spiegel, Timothy H Lucas, Srihari Y Sritharan, Andrew G Richardson, Pauline K Weigand, Ivette Planell-Mendez, Xilin Liu, Hongjie Zhu, Milin Zhang, Jan Van der Spiegel, Timothy H Lucas, Srihari Y Sritharan, Andrew G Richardson, Milin Zhang, Jan Van der Spiegel, Pauline K Weigand, Xilin Liu, Timothy H Lucas, Hongjie Zhu, Ivette Planell-Mendez
The sense of touch and proprioception are critical to movement control. After spinal cord injury, these senses may be restored with direct, electrical microstimulation of the brain as part of a complete sensorimotor neuroprosthesis. The present study was designed to test, in part, the hypothesis that the cuneate nucleus (CN) of the brainstem is a suitable site to encode somatosensory information. Two rhesus macaques were implanted with microelectrode arrays providing chronic access to the CN. The monkeys were trained on an active touch oddity task to detect vibrotactile stimuli...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227564/moving-object-detection-and-background-enhancement-for-thalamic-visual-prostheses
#9
Hossam H Abolfotuh, Amr Jawwad, Bassem Abdullah, Hani M K Mahdi, Seif Eldawlatly, Hossam H Abolfotuh, Amr Jawwad, Bassem Abdullah, Hani M K Mahdi, Seif Eldawlatly, Amr Jawwad, Hani M K Mahdi, Bassem Abdullah, Seif Eldawlatly, Hossam H Abolfotuh
Visual prostheses open the door of hope to restore functional vision for the blind. One of the main challenges facing their development is the limited number of electrodes used in the stimulation process which limits the resolution of the perceived images. To improve the perception, the useful features in the scene need to be enhanced while the other features should be suppressed to achieve better resolution. This paper introduces an image processing method to enhance three main features detectable by the natural visual pathway; namely the contrast, the motion and the edges...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227536/a-pilot-study-on-the-neurometric-evaluation-of-effective-and-ineffective-antismoking-public-service-announcements
#10
Giulia Cartocci, Enrica Modica, Dario Rossi, Anton Giulio Maglione, Isotta Venuti, Giulia Rossi, Elena Corsi, Fabio Babiloni, Giulia Cartocci, Enrica Modica, Dario Rossi, Anton Giulio Maglione, Isotta Venuti, Giulia Rossi, Elena Corsi, Fabio Babiloni, Enrica Modica, Isotta Venuti, Giulia Rossi, Fabio Babiloni, Anton Giulio Maglione, Dario Rossi, Elena Corsi, Giulia Cartocci
Tobacco use is the leading cause of preventable death and smoking-related illness worldwide. Research has shown that antismoking advertising may help reduce this habit. Nowadays, public service announcements (PSAs) are considered "Effective" or "Ineffective" on the base of official reports concerning behavioral/attitudinal changes toward healthier patterns and health-related savings following the exposure to the PSA. In this pilot study, we described the results of the use of three neurometric indexes for the evaluation of the efficacy of a couple of antismoking PSAs in a reduced sample of voluntary participants...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227472/social-norms-of-good-design-interdisciplinary-perspectives-from-a-survey-of-engineers-and-clinicians-in-bioengineering
#11
Angela N Johnson, Angela N Johnson, Angela N Johnson
In bioengineering training for new researchers and engineers, a great deal of time is spent discussing what constitutes "good" design. Conceptualization of good design, however, varies widely across interdisciplinary team members, with potential to both foster innovation or lead to unproductive conflict. To explore how groups central to bioengineering teams (physicians/clinicians and engineers/physicists) conceptualize good design, we asked 176 professionals in bioengineering to complete a comprehensive online survey including items designed to assess cognitive and moral foundations (validated MFQ30 tool) and custom items assessing perceptions on good design in three areas (good design characteristics, reputation of design approvers, and perceived design patient/consumer suitability)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227399/functional-connectivity-analysis-using-whole-brain-and-regional-network-metrics-in-ms-patients
#12
V C Chirumamilla, V Fleischer, A Droby, T Anjum, M Muthuraman, F Zipp, S Groppa, V C Chirumamilla, V Fleischer, A Droby, T Anjum, M Muthuraman, F Zipp, S Groppa, A Droby, S Groppa, F Zipp, V C Chirumamilla, T Anjum, V Fleischer, M Muthuraman
In the present study we investigated brain network connectivity differences between patients with relapsing-remitting multiple sclerosis (RRMS) and healthy controls (HC) as derived from functional resonance magnetic imaging (fMRI) using graph theory. Resting state fMRI data of 18 RRMS patients (12 female, mean age ± SD: 42 ± 12.06 years) and 25 HC (8 female, 29.2 ± 5.38 years) were analyzed. In order to obtain information of differences in entire brain network, we focused on both, local and global network connectivity parameters...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227026/the-effects-of-perceived-usb-delay-for-sensor-and-embedded-system-development
#13
J Du, D Kade, C Gerdtman, O Ozcan, M Linden, J Du, D Kade, C Gerdtman, O Ozcan, M Linden, O Ozcan, M Linden, D Kade, C Gerdtman, J Du
Perceiving delay in computer input devices is a problem which gets even more eminent when being used in healthcare applications and/or in small, embedded systems. Therefore, the amount of delay found as acceptable when using computer input devices was investigated in this paper. A device was developed to perform a benchmark test for the perception of delay. The delay can be set from 0 to 999 milliseconds (ms) between a receiving computer and an available USB-device. The USB-device can be a mouse, a keyboard or some other type of USB-connected input device...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226938/a-wearable-skin-stretch-haptic-feedback-device-towards-improving-balance-control-in-lower-limb-amputees
#14
M A B Husman, H F Maqbool, M I Awad, A Abouhossein, A A Dehghani-Sanij, M A B Husman, H F Maqbool, M I Awad, A Abouhossein, A A Dehghani-Sanij, A Abouhossein, A A Dehghani-Sanij, M A B Husman, M I Awad, H F Maqbool
Haptic feedback to lower limb amputees is essential to maximize the functionality of a prosthetic device by providing information to the user about the interaction with the environment and the position of the prostheses in space. Severed sensory pathway and the absence of connection between the prosthesis and the Central Nervous System (CNS) after lower limb amputation reduces balance control, increases visual dependency and increases risk of falls among amputees. This work describes the design of a wearable haptic feedback device for lower limb amputees using lateral skin-stretch modality intended to serve as a feedback cue during ambulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226924/the-sound-of-actions-a-new-tool-to-study-music-perception-in-young-children
#15
Leonardo Di Perna, Nicola Di Stefano, Domenico Formica, Valentina Focaroli, Fabrizio Taffoni, Leonardo Di Perna, Nicola Di Stefano, Domenico Formica, Valentina Focaroli, Fabrizio Taffoni, Valentina Focaroli, Domenico Formica, Fabrizio Taffoni, Nicola Di Stefano, Leonardo Di Perna
In this work we describe a new sensing technique to study auditory preferences in young children based on the interaction between perception and action. Manipulation is assessed thanks to a novel device instrumented with a magneto-inertial sensing core. This system allows estimating the manipulation in terms of angular displacements with errors lower than I(o). The laboratory validation is presented and discussed in details. Moreover, a pilot trial on two children aged 34 and 35 months is reported to evaluate the appropriateness of the technology to the experimental aims...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226826/long-latency-components-of-somatosensory-evoked-potentials-during-passive-tactile-perception-of-gratings
#16
C Genna, F Artoni, C Fanciullacci, C Chisari, C M Oddo, S Micera, C Genna, F Artoni, C Fanciullacci, C Chisari, C M Oddo, S Micera, C M Oddo, F Artoni, S Micera, C Genna, C Fanciullacci, C Chisari
Perception of tactile stimuli elicits Somatosensory Evoked Potentials (SEPs) that can be recorded via non-invasive electroencephalography (EEG). However, it is not yet clear how SEPs localization, shape and latency are modulated by different stimuli during mechanical tactile stimulation of fingertips. The aim of this work is thus to characterize SEPs generated by the tactile perception of gratings during dynamic passive stimulation of the dominant fingertip by means of a mechatronic platform. Results show that a random sequence of stimuli elicited SEPs with two long-latency components: (i) a negative deflection around 140 ms located in the frontal-central-parietal side in the contralateral hemisphere; (ii) a positive deflection around 250 ms located in the frontal-central midline...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226822/hidden-markov-factor-analysis-as-a-spatiotemporal-model-for-electrocorticography
#17
Akinyinka Omigbodun, Werner K Doyle, Orrin Devinsky, Daniel Friedman, Thomas Thesen, Vikash Gilja, Akinyinka Omigbodun, Werner K Doyle, Orrin Devinsky, Daniel Friedman, Thomas Thesen, Vikash Gilja, Akinyinka Omigbodun, Thomas Thesen, Vikash Gilja, Werner K Doyle, Orrin Devinsky, Daniel Friedman
We present a new approach to extracting low-dimensional neural trajectories that summarize the electrocorticographic (ECoG) signals recorded with high-channel-count electrode arrays implanted subdurally. In our approach, Hidden-Markov Factor Analysis (HMFA), a finite set of factor analyzers are used to model the relationship between the high-dimensional ECoG neural space and a low-dimensional latent neural space; the factor analyzers at different time points are in turn linked together with a hidden Markov model...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226821/cortical-auditory-evoked-potentials-caeps-represent-neural-cues-relevant-to-pitch-perception
#18
Xiaochen Zhang, Qin Gong, Tao Zhang, Xiaochen Zhang, Qin Gong, Tao Zhang, Xiaochen Zhang, Tao Zhang, Qin Gong
Components of auditory event-related potentials (ERPs) may represent various aspects of the cortical processing of pitch. However, evidence hints an earlier representation of pitch perception in auditory ERPs of cortical origin. In this study, we examined whether earlier waves in cortical auditory evoked potentials (CAEPs) might reflect pitch-relevant features of both listeners and stimuli. CAEPs were elicited by pure tones and sweeping tones, and individual behavioral performance in pitch discrimination reflected by frequency difference limen (FDL) was also measured...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226680/fast-scale-invariant-lateral-lumbar-vertebrae-detection-and-segmentation-in-x-ray-images
#19
Ruhan Sa, William Owens, Raymond Wiegand, Vipin Chaudhary, Ruhan Sa, William Owens, Raymond Wiegand, Vipin Chaudhary, William Owens, Ruhan Sa, Raymond Wiegand, Vipin Chaudhary
Fully automatic localization of lumbar vertebrae from clinical X-ray images is very challenging due to the variation of X-ray quality, scale, contrast, number of visible vertebrae, etc. To overcome these challenges, we present a novel framework, where we accelerate a scale-invariant object detection method using Support Vector Machines (SVM) trained on Histogram of Oriented Gradients (HOG) features and segmenting a fine vertebra contour using Gradient Vector Flow (GVF) based snake model. Support Vector Machines trained on HOG features are now an object detection standard in many perception fields and have demonstrated good performance on medical images as well...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226429/postural-responses-after-utilization-of-a-computerized-biofeedback-based-intervention-aimed-at-improving-static-and-dynamic-balance-in-traumatic-brain-injury-a-case-study
#20
Rakesh Pilkar, Nibal Arzouni, Arvind Ramanujam, Kathleen Chervin, Karen J Nolan, Rakesh Pilkar, Nibal Arzouni, Arvind Ramanujam, Kathleen Chervin, Karen J Nolan, Arvind Ramanujam, Kathleen Chervin, Nibal Arzouni, Karen J Nolan, Rakesh Pilkar
Balance dysfunction is one of the most disabling aspects of Traumatic Brain Injury (TBI). Without rapid transmission and accurate perception of somatosensory inputs, the automatic postural responses required during standing may be delayed or absent after TBI which can lead to instability. Further, the sensitivity level to which environmental perturbations can be detected is also vital, as the central nervous system will only employ balance control strategies when it perceives a change in equilibrium. Such undetectable perturbations, however small they may be, can result in fatal falls, especially after TBI...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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