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Degradation Of Auditory Localization Performance Due To Helmet Ear Coverage The Effects Of Normal Acoustic Reverberation
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Book Synopsis Degradation of Auditory Localization Performance Due to Helmet Ear Coverage: The Effects of Normal Acoustic Reverberation by :
Download or read book Degradation of Auditory Localization Performance Due to Helmet Ear Coverage: The Effects of Normal Acoustic Reverberation written by and published by . This book was released on 2009 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous research has shown that listeners wearing the Personnel Armor System for Ground Troops (PASGT) helmet performed worse than those wearing the Advanced Combat Helmet on sound localization tasks. The PASGT has greater coverage over the ears. However, these helmets also differ in their suspension systems and profiles. Three versions of a single helmet design, differing only in the ear coverage, were compared in this study. As ear coverage increased, localization performance decreased. Most of the change was due to increases in large errors (>25-deg). In addition, these effects were tested in both "ideal" laboratory acoustics and in a moderately reverberant environment. Moderate reverberation intensified the effects of ear coverage -- improving localization performance without a helmet and impairing it the most in the greatest ear coverage condition.
Book Synopsis Designing Soldier Systems by : John Martin
Download or read book Designing Soldier Systems written by John Martin and published by CRC Press. This book was released on 2018-05-20 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on contemporary human factors issues within the design of soldier systems and describes how they are currently being investigated and addressed by the U.S. Army to enhance soldier performance and effectiveness. Designing Soldier Systems approaches human factors issues from three main perspectives. In the first section, Chapters 1-5 focus on complexity introduced by technology, its impact on human performance, and how issues are being addressed to reduce cognitive workload. In the second section, Chapters 6-10 concentrate on obstacles imposed by operational and environmental conditions on the battlefield and how they are being mitigated through the use of technology. The third section, Chapters 11-21, is dedicated to system design and evaluation including the tools, techniques and technologies used by researchers who design soldier systems to overcome human physical and cognitive performance limitations as well as the obstacles imposed by environmental and operations conditions that are encountered by soldiers. The book will appeal to an international multidisciplinary audience interested in the design and development of systems for military use, including defense contractors, program management offices, human factors engineers, human system integrators, system engineers, and computer scientists. Relevant programs of study include those in human factors, cognitive science, neuroscience, neuroergonomics, psychology, training and education, and engineering.
Book Synopsis Advances in Human Factors in Simulation and Modeling by : Daniel N. Cassenti
Download or read book Advances in Human Factors in Simulation and Modeling written by Daniel N. Cassenti and published by Springer. This book was released on 2018-06-26 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on computational modeling and simulation research that advances the current state-of-the-art regarding human factors in this area. It reports on cutting-edge simulators such as virtual and augmented reality, on multisensory environments, and on modeling and simulation methods used in various applications, including surgery, military operations, occupational safety, sports training, education, transportation and robotics. Based on the AHFE 2018 International Conference on Human Factors in Simulation and Modeling, held on July 21–25, 2018, in Orlando, Florida, USA, the book serves as a timely reference guide for researchers and practitioners developing new modeling and simulation tools for analyzing or improving human performance. It also offers a unique resource for modelers seeking insights into human factors research and more feasible and reliable computational tools to foster advances in this exciting research field.
Book Synopsis THE EFFECTS OF DISPLACED EARS ON AUDITORY LOCALIZATION. by :
Download or read book THE EFFECTS OF DISPLACED EARS ON AUDITORY LOCALIZATION. written by and published by . This book was released on 1964 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The techniques of rearrangement and disarrangement were used to alter the normal relationship between an observer and his auditory or visual environment. In general, rearrangement leads to orderly adaptation of perceptual-motor performance, while disarrangement leads to degradation of performance. This experiment was an auditory rearrangement. Subjects' judgments of auditory direction were displaced laterally by means of a high-fidelity pseudophone that effectively rotated the interaural axis through a 20 degree horizontal angle. After exposure sessions that consisted of walking repeatedly toward a fixed sound source for 20 minutes, two of the four experimental subjects demonstrated significant shifts averaging 6 degrees in their judgments of auditory direction. The shifts partially compensated for the error of localization produced by the pseudophone. The shifts in localization are discussed in terms of the nature of the exposure situation and the factors that are likely to be responsible for compensation.
Book Synopsis The Effect of Helmet Form on Hearing by : R. Bradley Randall
Download or read book The Effect of Helmet Form on Hearing written by R. Bradley Randall and published by . This book was released on 1972 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: RD H. ;HEL-TN-10-72(*helmets, *hearing), (*speech recognition, helmets), intelligibility, audiometry, army personnel, human factors engineering, army research*intelligibility, *speech recognition The report presents the results of an investigation of the effects of a standard and of an experimental helmet on speech intelligibility and sound localization. Eight enlisted men with no hearing deficits were used as subjects. Intelligibility was tested with the American Standard Method for Measurement of Monosyllabic Word Intelligibility. Localization error was determined for three groups of noise bands one octave wide with center frequencies of 250, 2000 and 8000 Hz. There were no practical differences between the two helmets, nor between the bareheaded and helmeted conditions with either helmet.
Book Synopsis Effects of Aging on Sound Localization in the Median Sagittal Plane by : Timothy J. Vander Velde
Download or read book Effects of Aging on Sound Localization in the Median Sagittal Plane written by Timothy J. Vander Velde and published by . This book was released on 1996 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Displaced Ears of Auditory Localization by : Kenneth Stampfer ((AB, Harvard College, 1964))
Download or read book The Effects of Displaced Ears of Auditory Localization written by Kenneth Stampfer ((AB, Harvard College, 1964)) and published by . This book was released on 1964 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Impact of Hearing Protection on Sound Localization and Orienting Behavior by :
Download or read book The Impact of Hearing Protection on Sound Localization and Orienting Behavior written by and published by . This book was released on 2005 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of hearing protection devices (HPDs) on sound localization was examined in the context of an auditory- cued visual search task. Participants were required to locate and identify a visual target in a field of 5, 20, or 50 visual distractors randomly distributed on the interior surface of a sphere. Four HPD conditions were examined: earplugs, earmuffs, both earplugs and earmuffs simultaneously, and no hearing protection. There was also a control condition in which no auditory cue was provided. A repeated measures analysis of variance revealed significant main effects of HPD for both search time and head motion data, indicating that the degree to which localization is disrupted by HPDs varies with the type of device worn. When both earplugs and earmuffs are worn simultaneously, search times and head motion are more similar to those found when no auditory cue is provided than when either earplugs or earmuffs alone are worn, suggesting that sound localization cues are so severely disrupted by double hearing protection that the listener can recover little or no information regarding the direction of sound source origin. Potential applications of this research include high-noise military, aerospace, and industrial settings in which HPDs are necessary but wearing double protection may compromise safety and/or performance.
Book Synopsis INTERNATIONAL SYMPOSIUM on the USE of CYBERNETICS on the RAILWAYS. PROCEEDINGS. by :
Download or read book INTERNATIONAL SYMPOSIUM on the USE of CYBERNETICS on the RAILWAYS. PROCEEDINGS. written by and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Integrated Hearing Protection Surround Levels on Sound Localization by : Sharon M Abel
Download or read book The Effect of Integrated Hearing Protection Surround Levels on Sound Localization written by Sharon M Abel and published by . This book was released on 2015 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Human Auditory Localization Performance in Azimuth by :
Download or read book Human Auditory Localization Performance in Azimuth written by and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Harry G. Armstrong Aerospace Medical Research Laboratory developed a unique research auditory localization facility for special, in-depth investigations of human auditory localization phenomena. A study was conducted in the facility to measure localization performance with three types of acoustic signal in azimuth; (1) natural, free-field acoustic cues heard with the ears uncovered, (2) simulated cues recorded at the ears of an acoustic manikin and presented over headphones, and (3) acoustic cues generated by an electronic auditory localization cue synthesizer and presented over headphones. Purposes of the study were (1) to evaluate relative localization accuracy and response time with the free-field, simulated and synthesized cues, (2) to examine the feasibility of localization of synthesized cues over headphones, and (3) to establish data base of human auditory localization performance with these signals. Results across the three conditions averaged about 5 to 6 degrees in accuracy (magnitude error) and 3.5 to 4.5 seconds in response time. Localization performance with simulated and synthesized cues was essentially equivalent to natural (free-field) cues, demonstrating the capability of the localization cue synthesizer to present realistic directional sounds in azimuth.
Book Synopsis Noise Induced Hearing Loss and Auditory Localization by :
Download or read book Noise Induced Hearing Loss and Auditory Localization written by and published by . This book was released on 2003 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many studies have been conducted on the ability of normal hearing listeners to judge the locations of various sounds. A few researchers have explored the effects of noiseinduced hearing loss on auditory localization acuity (Noble, Byrne and Lepage, 1994; Smith- Olinde, Koehnke and Besing, 1998; and Lorenzi, Gatehouse and Lever, 1999). These researchers have shown that the use of higher frequency energy in the signal is reduced by high-frequency hearing loss. Elevation acuity is more affected by high-frequency hearing loss than azimuth acuity, which is dominated by interaural time difference cues. Many factors, including the temporal and spectral characteristics of the sound source, the listening environment, the types of interfering sound sources, and the listener s auditory system, affect localization acuity. Two of those factors, the effects of noise-induced hearing loss and head motion cues, are reported in the current study.
Book Synopsis Effects of Reverberation Conditions and Physical Versus Virtual Source Placement on Localization in Virtual Sound Environments by : Anna Christine Catton
Download or read book Effects of Reverberation Conditions and Physical Versus Virtual Source Placement on Localization in Virtual Sound Environments written by Anna Christine Catton and published by . This book was released on 2018 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sound field synthesis systems vary in number and arrangement of loudspeakers and methods used to generate virtual sound environments to study human hearing perception. While previous work has evaluated the accuracy with which these systems physically reproduce room acoustic conditions, less is known on assessing subjective perception of those conditions, such as how well such systems preserve source localization. This work quantifies the accuracy and precision of perceived localization from a multi-channel sound field synthesis system at Boys Town National Research Hospital, which used 24 physical loudspeakers and vector-based amplitude panning to generate sound fields. Short bursts of broadband speech-shaped noise were presented from source locations (either coinciding with a physical loudspeaker location, or panned between loudspeakers) under free-field and modeled reverberant-room conditions. Listeners used a HTC Vive remote laser tracking system to point to the perceived source location.Results show that the system synthesizes source locations accurately for both physical and panned sources, in both azimuth and elevation. Panned sources, though, are localized less precisely than physical sources. Reverberant condition is also found to affect both the accuracy and precision of localization in the azimuthal plane, with dry conditions producing greater accuracy and better precision. Only accuracy (not precision) of localization in elevation was impacted by reverberant condition, with reverberant cases producing results closer to the target than dry cases. An interaction effect of reverberant condition with elevation on localization in elevation, though, indicates that dry conditions result in better localization in elevation than reverberant ones at an elevation close to head height, but the situations at higher elevations are where subjects localized dry sources lower than the target height, while reverberant ones were more accurately placed. Other laboratories with sound field synthesis systems are encouraged to gather similar data on the accuracy and precision of localization in azimuth and elevation, so that results from studies using these systems can be better interpreted in light of the capabilities of the system to generate accurate and precise reproductions of source locations. [Work supported by NIH GM109023.]
Book Synopsis The Effect of Head Position on Auditory Localization by : Alvin George Goldstein
Download or read book The Effect of Head Position on Auditory Localization written by Alvin George Goldstein and published by . This book was released on 1951 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Auditory Localization Test Procedure by : William R. Howse
Download or read book Development of Auditory Localization Test Procedure written by William R. Howse and published by . This book was released on 1984 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research reported was to develop a system for rapid assessment of human auditory localization ability as affected by various hearing and ballistic protection devices. This study is a partial replication of an earlier study in which stimuli were presented using multiple transducers. The purposes of this study are to demonstrate the abilities of a second generation assessment system using a single transducer in a larger controlled environment and to provide initial data to use for comparison in future experiments. This second generation system eliminates extraneous cues to localization provided by differing frequency spectrum signatures of multiple transducers, and provides greatly increased angular resolution for stimulus presentation. The same hearing protective devices tested in the multiple transducer study are considered here. The DH-178 helmet is a prototype ballistic helmet combined with circumaural hearing protection and a 'talk-through' amplification of high level acoustic input. The DH-178 was two independent amplification circuits, one for each ear. It therefore provides a dichotic signal to the wearer. The DH-140 is also a ballistic helmet similar to the DH-178. The most important difference is that the DH-14- uses single amplification circuit distributed to the two ears. It provides a diotic signal to the wearer. Keywords: Ballistic helmets; Auditory signal processing; Hearing protection.
Book Synopsis Effect of Head Movement on Sound Localization in Real and Simulated Cochlear Implant Users by : Kassandra-Anne Birtch
Download or read book Effect of Head Movement on Sound Localization in Real and Simulated Cochlear Implant Users written by Kassandra-Anne Birtch and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cochlear implant (CI) users' limited ability to use acoustical cues for sound localization causes left/right confusions and front/back reversals. Head movement is beneficial in reducing these errors in acoustically hearing listeners. This study investigated the effect of head movement on localization throughout 360o of azimuth for both real and simulated CI users. Listeners in a bilateral electro-acoustic (CI with ipsilateral hearing aid) simulation derived the greatest head movement benefit in reducing front/back reversals. Left/right confusions were reduced in simulations with matched bilateral stimulation. Sensitivity to both timing and level cues for sound localization was correlated with sound localization performance without head movement for simulated device users. Sensitivity to timing cues was correlated with sound localization performance with head movement cues for simulated device users. Simulations of bilateral CI and bimodal users (CI with contralateral hearing aid) listening predicted real users' sound localization performance, binaural sensitivity and head movement patterns.
Author :Committee on Noise-Induced Hearing Loss and Tinnitus Associated with Military Service from World War II to the Present Publisher : ISBN 13 : Total Pages :346 pages Book Rating :4.3/5 ( download)
Book Synopsis Noise and Military Service by : Committee on Noise-Induced Hearing Loss and Tinnitus Associated with Military Service from World War II to the Present
Download or read book Noise and Military Service written by Committee on Noise-Induced Hearing Loss and Tinnitus Associated with Military Service from World War II to the Present and published by . This book was released on 2006-01-20 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: People serving in the military will, at some point, be exposed to high-intensity noise of various types. Some may develop hearing loss, especially for high-frequency sounds, or tinnitus ("ringing in the ears"), or both, as a result of their noise exposure. Hearing loss or tinnitus incurred or aggravated during military service may qualify veterans for services and financial compensation from the Department of Veterans Affairs (VA). Since World War II, the human and financial cost associated with hearing loss among military veterans have repeatedly drawn attention to noise, hearing loss, and the need for hearing conservation in military settings.
