Intracranial mapping of auditory perception: event-related responses and electrocortical stimulation.
OBJECTIVE
We compared intracranial recordings of auditory event-related responses with electrocortical stimulation mapping (ESM) to determine their functional relationship.


METHODS
Intracranial recordings and ESM were performed, using speech and tones, in adult epilepsy patients with subdural electrodes implanted over lateral left cortex. Evoked N1 responses and induced spectral power changes were obtained by trial averaging and time-frequency analysis.


RESULTS
ESM impaired perception and comprehension of speech, not tones, at electrode sites in the posterior temporal lobe. There was high spatial concordance between ESM sites critical for speech perception and the largest spectral power (100% concordance) and N1 (83%) responses to speech. N1 responses showed good sensitivity (0.75) and specificity (0.82), but poor positive predictive value (0.32). Conversely, increased high-frequency power (>60Hz) showed high specificity (0.98), but poorer sensitivity (0.67) and positive predictive value (0.67). Stimulus-related differences were observed in the spatial-temporal patterns of event-related responses.


CONCLUSIONS
Intracranial auditory event-related responses to speech were associated with cortical sites critical for auditory perception and comprehension of speech.


CONCLUSIONS
These results suggest that the distribution and magnitude of intracranial auditory event-related responses to speech reflect the functional significance of the underlying cortical regions and may be useful for pre-surgical functional mapping.
Sinai
A
A
Department of Neurology, Johns Hopkins School of Medicine, 600 North Wolfe Street, Meyer 2-147, Baltimore, MD 21287, USA.
Crone
N E
NE
Wied
H M
HM
Franaszczuk
P J
PJ
Miglioretti
D
D
Boatman-Reich
D
D
D000328:Adult; D001303:Auditory Cortex / Q000033:anatomy & histology / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D001931:Brain Mapping; D004192:Discrimination, Psychological / Q000502:physiology; D004558:Electric Stimulation / Q000379:methods; D004569:Electroencephalography / Q000379:methods; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011571:Psychoacoustics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis; D013997:Time Factors