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Cusinato R, Alnes SL, van Maren E, Boccalaro I, Ledergerber D, Adamantidis A, Imbach LL, Schindler K, Baud MO, Tzovara A. Intrinsic Neural Timescales in the Temporal Lobe Support an Auditory Processing Hierarchy. J Neurosci 2023; 43:3696-3707. [PMID: 37045604 PMCID: PMC10198454 DOI: 10.1523/jneurosci.1941-22.2023] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/21/2023] [Accepted: 03/02/2023] [Indexed: 04/14/2023] Open
Abstract
During rest, intrinsic neural dynamics manifest at multiple timescales, which progressively increase along visual and somatosensory hierarchies. Theoretically, intrinsic timescales are thought to facilitate processing of external stimuli at multiple stages. However, direct links between timescales at rest and sensory processing, as well as translation to the auditory system are lacking. Here, we measured intracranial EEG in 11 human patients with epilepsy (4 women), while listening to pure tones. We show that, in the auditory network, intrinsic neural timescales progressively increase, while the spectral exponent flattens, from temporal to entorhinal cortex, hippocampus, and amygdala. Within the neocortex, intrinsic timescales exhibit spatial gradients that follow the temporal lobe anatomy. Crucially, intrinsic timescales at baseline can explain the latency of auditory responses: as intrinsic timescales increase, so do the single-electrode response onset and peak latencies. Our results suggest that the human auditory network exhibits a repertoire of intrinsic neural dynamics, which manifest in cortical gradients with millimeter resolution and may provide a variety of temporal windows to support auditory processing.SIGNIFICANCE STATEMENT Endogenous neural dynamics are often characterized by their intrinsic timescales. These are thought to facilitate processing of external stimuli. However, a direct link between intrinsic timing at rest and sensory processing is missing. Here, with intracranial EEG, we show that intrinsic timescales progressively increase from temporal to entorhinal cortex, hippocampus, and amygdala. Intrinsic timescales at baseline can explain the variability in the timing of intracranial EEG responses to sounds: cortical electrodes with fast timescales also show fast- and short-lasting responses to auditory stimuli, which progressively increase in the hippocampus and amygdala. Our results suggest that a hierarchy of neural dynamics in the temporal lobe manifests across cortical and limbic structures and can explain the temporal richness of auditory responses.
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Affiliation(s)
- Riccardo Cusinato
- Institute of Computer Science, University of Bern, Bern 3012, Switzerland
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
| | - Sigurd L Alnes
- Institute of Computer Science, University of Bern, Bern 3012, Switzerland
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
| | - Ellen van Maren
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
| | - Ida Boccalaro
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
| | | | - Antoine Adamantidis
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
| | - Lukas L Imbach
- Swiss Epilepsy Center, Klinik Lengg, Zurich 8008, Switzerland
| | - Kaspar Schindler
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
| | - Maxime O Baud
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
| | - Athina Tzovara
- Institute of Computer Science, University of Bern, Bern 3012, Switzerland
- Center for Experimental Neurology, Sleep Wake Epilepsy Center, NeuroTec, Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern 3010, Switzerland
- Helen Wills Neuroscience Institute, University of California-Berkeley, Berkeley 94720, California
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