A5016688241- Hearing Loss and Rehabilitation
- Noise Effects and Management
- Neuroscience and Music Perception
- Multisensory perception and integration
- Neural dynamics and brain function
- Speech and Audio Processing
- Visual perception and processing mechanisms
- Tactile and Sensory Interactions
- Hearing, Cochlea, Tinnitus, Genetics
- Acoustic Wave Phenomena Research
- Vehicle Noise and Vibration Control
- Phonetics and Phonology Research
- Structural Health Monitoring Techniques
- Neural Networks and Applications
- Infrared Target Detection Methodologies
- CCD and CMOS Imaging Sensors
- Visual Attention and Saliency Detection
- Underwater Acoustics Research
- Functional Brain Connectivity Studies
- Engineering Education and Pedagogy
- Neurobiology of Language and Bilingualism
- Infrared Thermography in Medicine
- Optical Imaging and Spectroscopy Techniques
- Hearing Impairment and Communication
- Animal Vocal Communication and Behavior
Boys Town
2019-2024
Boys Town National Research Hospital
2019-2024
Vanderbilt University
2013-2021
Vanderbilt University Medical Center
2013-2015
University of Washington
2005-2014
University of Helsinki
2014
Language Science (South Korea)
2000-2013
VA Northern California Health Care System
2006-2009
University of Michigan
2002-2008
University of California, Davis
2007
Although the auditory cortex plays a necessary role in sound localization, physiological investigations reveal inhomogeneous sampling of space that is difficult to reconcile with localization behavior under assumption local spatial coding. Most neurons respond maximally sounds located far left or right side, few tuned frontal midline. Paradoxically, psychophysical studies show optimal acuity across In this paper, we revisit problem three fields cat cortex. each field, confirm neural...
Background While human auditory cortex is known to contain tonotopically organized cortical fields (ACFs), little about how processing in these modulated by other acoustic features or attention. Methodology/Principal Findings We used functional magnetic resonance imaging (fMRI) and population-based surface analysis characterize the tonotopic organization of analyze influence tone intensity, ear delivery, scanner background noise, intermodal selective attention on activations. Medial...
Background Recent neuroimaging studies have revealed that putatively unimodal regions of visual cortex can be activated during auditory tasks in sighted as well blind subjects. However, the task determinants and functional significance occipital activations (AOAs) remains unclear. Methodology/Principal Findings We examined AOAs an intermodal selective attention to distinguish whether they were stimulus-bound or recruited by higher-level cognitive operations associated with attention....
While auditory cortex in non-human primates has been subdivided into multiple functionally specialized cortical fields (ACFs), the boundaries and functional specialization of human ACFs have not defined. In current study, we evaluated whether a widely accepted primate model could explain regional tuning properties fMRI activations on surface to attended non-attended tones different frequency, location, intensity. The limits were defined by voxels that showed significant sounds. Three...
Early blind subjects exhibit superior abilities for processing auditory motion, which are accompanied by enhanced BOLD responses to motion within hMT+ and reduced right planum temporale (rPT). Here, comparing in rPT sighted controls, early blind, late sight-recovery individuals, we were able separately examine the effects of developmental adult visual deprivation on cortical plasticity these two areas. We find that both functionality driven absence experience life; neither loss nor recovery...
We compared the spatial tuning properties of neurons in two fields [primary auditory cortex (A1) and posterior field (PAF)] cat cortex. Broadband noise bursts 80-ms duration were presented from loudspeakers throughout 360° horizontal plane (azimuth) or 260° vertical median (elevation). Sound levels varied 20 to 40 dB above units' thresholds. recorded neural spike activity simultaneously 16 sites PAF and/or A1 α-chloralose-anesthetized cats. assessed sensitivity by examining dependence count...
We assessed the effects of perceptual training syllable identification in noise on nonsense test (NST) performance new (Experiment 1) and experienced 2) hearing aid (HA) users with sensorineural loss. In Experiment 1, HA were randomly assigned to either immediate (IT) or delayed (DT) groups. IT subjects underwent 8 weeks at-home in-laboratory testing, whereas DT identical testing without training. Training produced large improvements subjects, spontaneous improvement was minimal subjects....
Studies showing that occipital cortex responds to auditory and tactile stimuli after early blindness are often interpreted as demonstrating blind subjects "see" stimuli. However, it is not clear whether these responses directly mediate the perception of auditory/tactile stimuli, or simply modulate augment within other sensory areas. We used fMRI pattern classification categorize perceived direction motion for both coherent ambiguous In sighted individuals, was accurately categorized based on...
Acoustics research involving human participants typically takes place in specialized laboratory settings. Listening studies, for example, may present controlled sounds using calibrated transducers sound-attenuating or anechoic chambers. In contrast, remote testing outside of the everyday settings (e.g., participants' homes). Remote could provide greater access to participants, larger sample sizes, and opportunities characterize performance typical listening environments at cost reduced...
A set of experiments was conducted to examine the loudness sounds with temporally asymmetric amplitude envelopes. Envelopes were generated fast-attack/slow-decay characteristics produce F–S (or “fast–slow”) stimuli, while reversed versions these same envelopes produced corresponding S–F (“slow–fast”) stimuli. For sinusoidal (330–6000 Hz) and broadband noise carriers, stimuli louder than equal energy. The magnitude this effect sensitive stimulus order, largest differences between occurring...
We compared the spatial sensitivity of neural responses in three areas cat auditory cortex: primary cortex (A1), posterior field (PAF), and dorsal zone (DZ). Stimuli were 80-ms pure tones or broadband noise bursts varying free-field azimuth (in horizontal plane) elevation vertical median plane), presented at levels 20–40 dB above units' thresholds. recorded extracellular spike activity simultaneously from 16 to 32 sites one two α-chloralose-anesthetized cats. examined dependence counts...
We examined the contributions of primary auditory cortex (A1) and dorsal zone (DZ) to sound localization behavior during separate combined unilateral bilateral deactivation. From a central visual fixation point, cats learned make an orienting response (head movement approach) 100-ms broadband noise burst emitted from speaker or one 12 peripheral sites (located in front animal, left 90 degrees right degrees, at 15 intervals) along horizontal plane. Following training, each cat was implanted...
Significance Individuals determine horizontal sound location based on precise calculations of level and timing differences at the two ears. Although these cues are processed independently lower levels auditory system, their cortical processing remains poorly understood. This study seeks to address key questions. ( i ) Are integrated form a cue-independent representation space? ii How does active listening alter response cues? We use functional brain imaging questions, demonstrating that cue...
Temporal weighting functions (TWFs), quantifying sensitivity to interaural time differences (ITD) and level (ILD) over the duration of brief stimuli, were measured in 6 normal hearing subjects using trains 16 Gabor clicks centered at 4 kHz presented dichotically rates [inter-click intervals (ICI) 10, 5, 2.5, 1.25 ms]. Random ITD or ILD imposed independently on each click train separate conditions. The subject’s task was discriminate lateral position (“left” “right”). Receiver operating...
In Brief Objective: This study examined the effects of multichannel wide-dynamic range compression (WDRC) amplification and stimulus audibility on consonant recognition error patterns. Design: Listeners had either severe or mild to moderate sensorineural hearing loss. Each listener was monaurally fit with a wearable aid using typical clinical procedures, frequency-gain parameters, hybrid clinically prescribed ratios for desired sensation level (Scollie et al., 2005) NAL-NL (Dillon, 1999)....
Temporal variation in listeners' sensitivity to interaural time and level differences (ITD ILD) was assessed using the temporal weighting function (TWF) paradigm [Stecker Hafter (2002). J. Acoust. Soc. Am. 112, 1046-1057] context of sound-source lateralization. Brief Gabor click trains were presented over headphones with overall ITD and/or ILD ranging ±500 μs ±5 dB across trials; values for individual clicks within each train varied by an additional ±100 or ±2 allow TWF calculation multiple...
Auditory attention powerfully influences perception and modulates sound processing in auditory cortex, but the extent of attentional modulation subcortical pathway remains poorly understood. We examined effects intermodal using functional magnetic resonance imaging inferior colliculus cortex a demanding selective task silent paradigm designed to optimize activations. Both showed strong activations sound, modulations were restricted cortex.