Abstract
Speech comprehension difficulties are ubiquitous to aging and hearing loss, particularly in noisy environments. Older adults’ poorer speech-in-noise (SIN) comprehension has been related to abnormal neural representations within various nodes (regions) of the speech network, but how senescent changes in hearing alter the transmission of brain signals remains unspecified. We measured electroencephalograms in older adults with and without mild hearing loss during a SIN identification task. Using functional connectivity and graph-theoretic analyses, we show that hearing-impaired (HI) listeners have more extended (less integrated) communication pathways and less efficient information exchange among widespread brain regions (larger network eccentricity) than their normal-hearing (NH) peers. Parameter optimized support vector machine classifiers applied to EEG connectivity data showed hearing status could be decoded (> 85% accuracy) solely using network-level descriptions of brain activity, but classification was particularly robust using left hemisphere connections. Notably, we found a reversal in directed neural signaling in left hemisphere dependent on hearing status among specific connections within the dorsal–ventral speech pathways. NH listeners showed an overall net “bottom-up” signaling directed from auditory cortex (A1) to inferior frontal gyrus (IFG; Broca’s area), whereas the HI group showed the reverse signal (i.e., “top-down” Broca’s → A1). A similar flow reversal was noted between left IFG and motor cortex. Our full-brain connectivity results demonstrate that even mild forms of hearing loss alter how the brain routes information within the auditory–linguistic–motor loop.
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Notes
An array of 32 ch was used since our dataset included recording of brainstem potentials (Bidelman et al. 2019), which require a very high sample rate that taxes available throughput of our EEG system. Estimates indicate that the accuracy of LORETA for 32 ch is ~ 1.5 × less accurate than 64 ch (Michel et al. 2004). Still, inverse methods were applied uniformly across all listeners/groups so while overall localization precision might be underestimated, this would not account for group differences.
BRAPH does not implement directed measures of connectivity (Mijalkov et al. 2017) so our full-brain (global) analysis used undirected measures. As such, our full-brain analysis offers a somewhat qualitative view of hearing-related changes in brain connectivity. Consequently, we used directed connectivity metrics (PTE) for specific hypothesis testing and to evaluate hearing-related changes in specific connections with the auditory–linguistic-motor loop (e.g., Fig. 7). Together, our undirected and directed analyses at the full-brain and circuit level offer two complementary approaches that provide different, yet converging evidence for hearing-related changes in brain connectivity.
Our connectivity matrices were derived from source signals, which yield the most veridical estimate of functional brain connectivity (Bastos and Schoffelen 2016; Lai et al. 2018). Nevertheless, effects of field spread can never be fully abolished in EEG, even at the source level (Schoffelen and Gross 2009; Zhang et al. 2016) and correlated activity of adjacent sources reduces the accuracy of functional connectivity analysis (for an excellent review of this tradeoff, see Schoffelen and Gross 2009). However, proper interpretation of source connectivity results can be achieved by analyzing the relative changes in connectivity caused by experimental manipulations (Schoffelen and Gross 2009). Thus, because field spread effects are identical across our experimental conditions (i.e., groups; noise levels) they subtract out and are unlikely to account for group differences. Moreover, our characterizations of topographic connectivity patterns (Figs. 2, 3, 4, 56) reflect the organizational properties of the connectome at the full-brain level and these measures show good reliability in the face of residual correlated activity (Hardmeier et al. 2014).
This differs from Bidelman et al. (2019), where PTE values were not normalized between ± 0.5.
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Funding
This work was funded by Grants from the Canadian Institutes of Health Research (MOP 106619) and the Natural Sciences and Engineering Research Council of Canada (NSERC, 194536) awarded to C.A, and The Hearing Research Foundation awarded to S.R.A, and the National Institute on Deafness and Other Communication Disorders of the National Institutes of Health under award number NIH/NIDCD R01DC016267 (G.M.B.).
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Bidelman, G.M., Mahmud, M.S., Yeasin, M. et al. Age-related hearing loss increases full-brain connectivity while reversing directed signaling within the dorsal–ventral pathway for speech. Brain Struct Funct 224, 2661–2676 (2019). https://doi.org/10.1007/s00429-019-01922-9
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DOI: https://doi.org/10.1007/s00429-019-01922-9