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Auditory cortical deactivation during speech production and following speech perception: an EEG investigation of the temporal dynamics of the auditory alpha rhythm.

Jenson D, Harkrider AW, Thornton D, Bowers AL, Saltuklaroglu T - Front Hum Neurosci (2015)

Bottom Line: Production conditions were characterized by significant α event related synchronization (ERS; pFDR < 0.05) concurrent with EMG activity from speech production, consistent with speech-induced auditory inhibition.The presence of the same pattern following stimulus offset in discrimination conditions suggests that sensorimotor contributions following speech perception reflect covert replay, and that covert replay provides one source of the motor activity previously observed in some speech perception tasks.To our knowledge, this is the first time that inhibition of auditory regions by speech has been observed in real-time with the ICA/ERSP technique.

View Article: PubMed Central - PubMed

Affiliation: Department of Audiology and Speech Pathology, University of Tennessee Health Science Center Knoxville, TN, USA.

ABSTRACT
Sensorimotor integration (SMI) across the dorsal stream enables online monitoring of speech. Jenson et al. (2014) used independent component analysis (ICA) and event related spectral perturbation (ERSP) analysis of electroencephalography (EEG) data to describe anterior sensorimotor (e.g., premotor cortex, PMC) activity during speech perception and production. The purpose of the current study was to identify and temporally map neural activity from posterior (i.e., auditory) regions of the dorsal stream in the same tasks. Perception tasks required "active" discrimination of syllable pairs (/ba/ and /da/) in quiet and noisy conditions. Production conditions required overt production of syllable pairs and nouns. ICA performed on concatenated raw 68 channel EEG data from all tasks identified bilateral "auditory" alpha (α) components in 15 of 29 participants localized to pSTG (left) and pMTG (right). ERSP analyses were performed to reveal fluctuations in the spectral power of the α rhythm clusters across time. Production conditions were characterized by significant α event related synchronization (ERS; pFDR < 0.05) concurrent with EMG activity from speech production, consistent with speech-induced auditory inhibition. Discrimination conditions were also characterized by α ERS following stimulus offset. Auditory α ERS in all conditions temporally aligned with PMC activity reported in Jenson et al. (2014). These findings are indicative of speech-induced suppression of auditory regions, possibly via efference copy. The presence of the same pattern following stimulus offset in discrimination conditions suggests that sensorimotor contributions following speech perception reflect covert replay, and that covert replay provides one source of the motor activity previously observed in some speech perception tasks. To our knowledge, this is the first time that inhibition of auditory regions by speech has been observed in real-time with the ICA/ERSP technique.

No MeSH data available.


Related in: MedlinePlus

Rows (A,B) show sLORETA source solutions for left and right temporal α clusters, respectively, followed by ERSP analyses from passive listening (PasN) and active discrimination conditions (Qdis, Ndis) displaying patterns of ERS and ERD relative to baseline in the middle columns. The far right column shows significant time-frequency differences in spectral power across conditions (p < 0.05, corrected for multiple comparisons). Time courses across ERSP analyses were identical, though row (A) references stimulus onset and offset while row (B) references the timeline from Figure 1.
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Figure 6: Rows (A,B) show sLORETA source solutions for left and right temporal α clusters, respectively, followed by ERSP analyses from passive listening (PasN) and active discrimination conditions (Qdis, Ndis) displaying patterns of ERS and ERD relative to baseline in the middle columns. The far right column shows significant time-frequency differences in spectral power across conditions (p < 0.05, corrected for multiple comparisons). Time courses across ERSP analyses were identical, though row (A) references stimulus onset and offset while row (B) references the timeline from Figure 1.

Mentions: The third hypothesis was that ERSP analysis of auditory α clusters in discrimination conditions would demonstrate α ERS during time periods of μ ERD, consistent with the interpretation of PMC activity during speech discrimination as evidence of covert replay. Figure 6 shows van Essen maps (computed with sLORETA) showing activated voxels (p < 0.001) in the left (A) and right (B) hemisphere temporal clusters. ERSP analyses show differential patterns of ERS/ERD measured against baseline across the three perception conditions (PasN, Qdis, Ndis), within the 4–30 Hz bandwidth. The final column shows significant differences (pFDR < 0.05) among the three conditions.


Auditory cortical deactivation during speech production and following speech perception: an EEG investigation of the temporal dynamics of the auditory alpha rhythm.

Jenson D, Harkrider AW, Thornton D, Bowers AL, Saltuklaroglu T - Front Hum Neurosci (2015)

Rows (A,B) show sLORETA source solutions for left and right temporal α clusters, respectively, followed by ERSP analyses from passive listening (PasN) and active discrimination conditions (Qdis, Ndis) displaying patterns of ERS and ERD relative to baseline in the middle columns. The far right column shows significant time-frequency differences in spectral power across conditions (p < 0.05, corrected for multiple comparisons). Time courses across ERSP analyses were identical, though row (A) references stimulus onset and offset while row (B) references the timeline from Figure 1.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4597480&req=5

Figure 6: Rows (A,B) show sLORETA source solutions for left and right temporal α clusters, respectively, followed by ERSP analyses from passive listening (PasN) and active discrimination conditions (Qdis, Ndis) displaying patterns of ERS and ERD relative to baseline in the middle columns. The far right column shows significant time-frequency differences in spectral power across conditions (p < 0.05, corrected for multiple comparisons). Time courses across ERSP analyses were identical, though row (A) references stimulus onset and offset while row (B) references the timeline from Figure 1.
Mentions: The third hypothesis was that ERSP analysis of auditory α clusters in discrimination conditions would demonstrate α ERS during time periods of μ ERD, consistent with the interpretation of PMC activity during speech discrimination as evidence of covert replay. Figure 6 shows van Essen maps (computed with sLORETA) showing activated voxels (p < 0.001) in the left (A) and right (B) hemisphere temporal clusters. ERSP analyses show differential patterns of ERS/ERD measured against baseline across the three perception conditions (PasN, Qdis, Ndis), within the 4–30 Hz bandwidth. The final column shows significant differences (pFDR < 0.05) among the three conditions.

Bottom Line: Production conditions were characterized by significant α event related synchronization (ERS; pFDR < 0.05) concurrent with EMG activity from speech production, consistent with speech-induced auditory inhibition.The presence of the same pattern following stimulus offset in discrimination conditions suggests that sensorimotor contributions following speech perception reflect covert replay, and that covert replay provides one source of the motor activity previously observed in some speech perception tasks.To our knowledge, this is the first time that inhibition of auditory regions by speech has been observed in real-time with the ICA/ERSP technique.

View Article: PubMed Central - PubMed

Affiliation: Department of Audiology and Speech Pathology, University of Tennessee Health Science Center Knoxville, TN, USA.

ABSTRACT
Sensorimotor integration (SMI) across the dorsal stream enables online monitoring of speech. Jenson et al. (2014) used independent component analysis (ICA) and event related spectral perturbation (ERSP) analysis of electroencephalography (EEG) data to describe anterior sensorimotor (e.g., premotor cortex, PMC) activity during speech perception and production. The purpose of the current study was to identify and temporally map neural activity from posterior (i.e., auditory) regions of the dorsal stream in the same tasks. Perception tasks required "active" discrimination of syllable pairs (/ba/ and /da/) in quiet and noisy conditions. Production conditions required overt production of syllable pairs and nouns. ICA performed on concatenated raw 68 channel EEG data from all tasks identified bilateral "auditory" alpha (α) components in 15 of 29 participants localized to pSTG (left) and pMTG (right). ERSP analyses were performed to reveal fluctuations in the spectral power of the α rhythm clusters across time. Production conditions were characterized by significant α event related synchronization (ERS; pFDR < 0.05) concurrent with EMG activity from speech production, consistent with speech-induced auditory inhibition. Discrimination conditions were also characterized by α ERS following stimulus offset. Auditory α ERS in all conditions temporally aligned with PMC activity reported in Jenson et al. (2014). These findings are indicative of speech-induced suppression of auditory regions, possibly via efference copy. The presence of the same pattern following stimulus offset in discrimination conditions suggests that sensorimotor contributions following speech perception reflect covert replay, and that covert replay provides one source of the motor activity previously observed in some speech perception tasks. To our knowledge, this is the first time that inhibition of auditory regions by speech has been observed in real-time with the ICA/ERSP technique.

No MeSH data available.


Related in: MedlinePlus