The overall project goal is to understand variability in the functional organization of human auditory cortex. We will focus on within-subject variability in cortical auditory event-related responses (evoked, induced) of normal and impaired listeners. Participants are normal-hearing patients with medically intractable epilepsy who have subdural electrodes implanted for clinical purposes. Patients are identified as normal or impaired listeners based on behavioral tests of auditory processing. We hypothesize that patients with normal auditory processing abilities show stimulus-specific effects and low test-retest variability in cortical auditory event-related responses, while patients who are impaired listeners demonstrate reduced stimulus specificity and high test-retest variability. A repeated-measures design will be used to address three specific aims. Intracranial recordings will be obtained using simple and complex auditory stimuli. Preliminary studies have confirmed the feasibility of the methods proposed. Candidate: Dr. Boatman is an audiologist and clinical neurophysiologist with 12 years of clinical research experience using electrophysiological methods to investigate normal and impaired cortical auditory function. The intracranial auditory recording studies proposed complement the candidate's R01-funded electrocortical stimulation mapping research and will provide opportunities for additional training and research mentoring in signal processing and statistical modeling of multi-channel intracranial EEG data. Research: We will address three aims: 1) identify stimulus-related differences in cortical auditory responses;2) determine test-retest reliability;and 3) quantify within-subject variability by listening ability (normal, impaired). Single channel time-domain and time-frequency analyses will be used, with regression models, to quantify within-subject differences in early and late cortical evoked responses and induced spectral power changes. Multi-channel time-frequency analysis will be used to investigate functional connectivity.

Mentoring

Research mentoring activities will include research training for pre-doctoral and post-doctoral trainees from the clinical fields of audiology and neurology (epilepsy, clinical neurophysiology), and cross- disciplinary clinical research training for pre-doctoral students in biostatistics and biomedical engineering.

Public Health Relevance

Understanding variability in cortical auditory event-related responses has clinical implications for improved measurement accuracy and objective assessment of cortical auditory function. By studying within-subject variability in the cortical auditory event-related response patterns of epilepsy patients with subdural electrodes, we hope to provide new insights into the neural bases of auditory processing disorders common in epilepsy and to provide a framework for evaluating remediation therapies.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Midcareer Investigator Award in Patient-Oriented Research (K24)
Project #
5K24DC010028-04
Application #
8246449
Study Section
Special Emphasis Panel (ZDC1-SRB-L (47))
Program Officer
Sklare, Dan
Project Start
2009-04-01
Project End
2014-11-30
Budget Start
2012-04-01
Budget End
2013-11-30
Support Year
4
Fiscal Year
2012
Total Cost
$158,677
Indirect Cost
$11,754
Name
Johns Hopkins University
Department
Neurology
Type
Schools of Medicine
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Eliades, Steven J; Crone, Nathan E; Anderson, William S et al. (2014) Adaptation of high-gamma responses in human auditory association cortex. J Neurophysiol 112:2147-63
Cervenka, Mackenzie Carpenter; Corines, James; Boatman-Reich, Dana Frances et al. (2013) Electrocorticographic functional mapping identifies human cortex critical for auditory and visual naming. Neuroimage 69:267-76
Cervenka, Mackenzie C; Franaszczuk, Piotr J; Crone, Nathan E et al. (2013) Reliability of early cortical auditory gamma-band responses. Clin Neurophysiol 124:70-82
Ewen, Joshua B; Vining, Eileen P; Smith, Cynthia A et al. (2011) Cognitive and EEG fluctuation in benign childhood epilepsy with central-temporal spikes: a case series. Epilepsy Res 97:214-9
Cervenka, Mackenzie C; Nagle, Stephanie; Boatman-Reich, Dana (2011) Cortical high-gamma responses in auditory processing. Am J Audiol 20:171-80
Ritaccio, Anthony; Boatman-Reich, Dana; Brunner, Peter et al. (2011) Proceedings of the Second International Workshop on Advances in Electrocorticography. Epilepsy Behav 22:641-50
Sinai, A; Crone, N E; Wied, H M et al. (2009) Intracranial mapping of auditory perception: event-related responses and electrocortical stimulation. Clin Neurophysiol 120:140-9