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Bartoli E, Devara E, Dang HQ, Rabinovich R, Mathura RK, Anand A, Pascuzzi BR, Adkinson J, Kenett YN, Bijanki KR, Sheth SA, Shofty B. Default mode network electrophysiological dynamics and causal role in creative thinking. Brain 2024; 147:3409-3425. [PMID: 38889248 PMCID: PMC11449134 DOI: 10.1093/brain/awae199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 05/07/2024] [Accepted: 05/24/2024] [Indexed: 06/20/2024] Open
Abstract
The default mode network (DMN) is a widely distributed, intrinsic brain network thought to play a crucial role in internally directed cognition. The present study employs stereo-EEG in 13 human patients, obtaining high resolution neural recordings across multiple canonical DMN regions during two processes that have been associated with creative thinking: spontaneous and divergent thought. We probe these two DMN-associated higher cognitive functions through mind wandering and alternate uses tasks, respectively. Our results reveal DMN recruitment during both tasks, as well as a task-specific dissociation in spatiotemporal response dynamics. When compared to the fronto-parietal network, DMN activity was characterized by a stronger increase in gamma band power (30-70 Hz) coupled with lower theta band power (4-8 Hz). The difference in activity between the two networks was especially strong during the mind wandering task. Within the DMN, we found that the tasks showed different dynamics, with the alternate uses task engaging the DMN more during the initial stage of the task, and mind wandering in the later stage. Gamma power changes were mainly driven by lateral DMN sites, while theta power displayed task-specific effects. During alternate uses task, theta changes did not show spatial differences within the DMN, while mind wandering was associated to an early lateral and late dorsomedial DMN engagement. Furthermore, causal manipulations of DMN regions using direct cortical stimulation preferentially decreased the originality of responses in the alternative uses task, without affecting fluency or mind wandering. Our results suggest that DMN activity is flexibly modulated as a function of specific cognitive processes and supports its causal role in divergent thinking. These findings shed light on the neural constructs supporting different forms of cognition and provide causal evidence for the role of DMN in the generation of original connections among concepts.
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Affiliation(s)
- Eleonora Bartoli
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
| | - Ethan Devara
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
| | - Huy Q Dang
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
| | - Rikki Rabinovich
- Department of Neurosurgery, Clinical Neuroscience Center, University of Utah, Salt Lake City, UT 84132, USA
| | - Raissa K Mathura
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
| | - Adrish Anand
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
| | - Bailey R Pascuzzi
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
| | - Joshua Adkinson
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
| | - Yoed N Kenett
- Faculty of Data and Decision Sciences, Technion—Israel Institute of Technology, Haifa, 3200003Israel
| | - Kelly R Bijanki
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Sameer A Sheth
- Department of Neurosurgery, Baylor College of Medicine, Houston, TX 77030, USA
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Ben Shofty
- Department of Neurosurgery, Clinical Neuroscience Center, University of Utah, Salt Lake City, UT 84132, USA
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Bartoli E, Devara E, Dang HQ, Rabinovich R, Mathura RK, Anand A, Pascuzzi BR, Adkinson J, Bijanki KR, Sheth SA, Shofty B. Default mode network spatio-temporal electrophysiological signature and causal role in creativity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.13.557639. [PMID: 37786678 PMCID: PMC10541614 DOI: 10.1101/2023.09.13.557639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
The default mode network (DMN) is a widely distributed, intrinsic brain network thought to play a crucial role in internally-directed cognition. It subserves self-referential thinking, recollection of the past, mind wandering, and creativity. Knowledge about the electrophysiology underlying DMN activity is scarce, due to the difficulty to simultaneously record from multiple distant cortical areas with commonly-used techniques. The present study employs stereo-electroencephalography depth electrodes in 13 human patients undergoing monitoring for epilepsy, obtaining high spatiotemporal resolution neural recordings across multiple canonical DMN regions. Our results offer a rare insight into the temporal evolution and spatial origin of theta (4-8Hz) and gamma signals (30-70Hz) during two DMN-associated higher cognitive functions: mind-wandering and alternate uses. During the performance of these tasks, DMN activity is defined by a specific pattern of decreased theta coupled with increased gamma power. Critically, creativity and mind wandering engage the DMN with different dynamics: creativity recruits the DMN strongly during the covert search of ideas, while mind wandering displays the strongest modulation of DMN during the later recall of the train of thoughts. Theta band power modulations, predominantly occurring during mind wandering, do not show a predominant spatial origin within the DMN. In contrast, gamma power effects were similar for mind wandering and creativity and more strongly associated to lateral temporal nodes. Interfering with DMN activity through direct cortical stimulation within several DMN nodes caused a decrease in creativity, specifically reducing the originality of the alternate uses, without affecting creative fluency or mind wandering. These results suggest that DMN activity is flexibly modulated as a function of specific cognitive processes and supports its causal role in creative thinking. Our findings shed light on the neural constructs supporting creative cognition and provide causal evidence for the role of DMN in the generation of original connections among concepts.
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Affiliation(s)
- E Bartoli
- Department of Neurosurgery, Baylor College of Medicine, USA
| | - E Devara
- Department of Neurosurgery, Baylor College of Medicine, USA
| | - H Q Dang
- Department of Neurosurgery, Baylor College of Medicine, USA
| | - R Rabinovich
- Department of Neurosurgery, University of Utah, USA
| | - R K Mathura
- Department of Neurosurgery, Baylor College of Medicine, USA
| | - A Anand
- Department of Neurosurgery, Baylor College of Medicine, USA
| | - B R Pascuzzi
- Department of Neurosurgery, Baylor College of Medicine, USA
| | - J Adkinson
- Department of Neurosurgery, Baylor College of Medicine, USA
| | - K R Bijanki
- Department of Neurosurgery, Baylor College of Medicine, USA
- Department of Neuroscience, Baylor College of Medicine, USA
| | - S A Sheth
- Department of Neurosurgery, Baylor College of Medicine, USA
- Department of Neuroscience, Baylor College of Medicine, USA
| | - B Shofty
- Department of Neurosurgery, University of Utah, USA
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Aljishi A, Sherman BE, Huberdeau DM, Obaid S, Sivaraju A, Turk-Browne NB, Damisah EC. Statistical learning in epilepsy: Behavioral, anatomical, and causal mechanisms in the human brain. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.04.25.538321. [PMID: 37162937 PMCID: PMC10168289 DOI: 10.1101/2023.04.25.538321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Statistical learning, the fundamental cognitive ability of humans to extract regularities across experiences over time, engages the medial temporal lobe in the healthy brain. This leads to the hypothesis that statistical learning may be impaired in epilepsy patients, and that this impairment could contribute to their varied memory deficits. In turn, epilepsy patients provide a platform to advance basic understanding of statistical learning by helping to evaluate the necessity of medial temporal lobe circuitry through disease and causal perturbations. We implemented behavioral testing, volumetric analysis of the medial temporal lobe substructures, and direct electrical brain stimulation to examine statistical learning across a cohort of 61 epilepsy patients and 28 healthy controls. Behavioral performance in a statistical learning task was negatively associated with seizure frequency, irrespective of where seizures originated in the brain. The volume of hippocampal subfields CA1 and CA2/3 correlated with statistical learning performance, suggesting a more specific role of the hippocampus. Indeed, transient direct electrical stimulation of the hippocampus disrupted statistical learning. Furthermore, the relationship between statistical learning and seizure frequency was selective: behavioral performance in an episodic memory task was impacted by structural lesions in the medial temporal lobe and by antiseizure medications, but not by seizure frequency. Overall, these results suggest that statistical learning may be hippocampally dependent and that this task could serve as a clinically useful behavioral assay of seizure frequency distinct from existing neuropsychological tests. Simple and short statistical learning tasks may thus provide patient-centered endpoints for evaluating the efficacy of novel treatments in epilepsy.
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Affiliation(s)
- Ayman Aljishi
- Department of Neurosurgery, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Brynn E. Sherman
- Department of Psychology, Yale University, New Haven, CT 06520, USA
| | | | - Sami Obaid
- Department of Neurosurgery, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Adithya Sivaraju
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Nicholas B. Turk-Browne
- Department of Psychology, Yale University, New Haven, CT 06520, USA
- Wu Tsai Institute, Yale University, New Haven, CT, 06510, USA
| | - Eyiyemisi C. Damisah
- Department of Neurosurgery, Yale University School of Medicine, New Haven, CT 06510, USA
- Wu Tsai Institute, Yale University, New Haven, CT, 06510, USA
- Department of Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA
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Parvizi J, Veit MJ, Barbosa DA, Kucyi A, Perry C, Parker JJ, Shivacharan RS, Chen F, Yih J, Gross JJ, Fisher R, McNab JA, Falco-Walter J, Halpern CH. Complex negative emotions induced by electrical stimulation of the human hypothalamus. Brain Stimul 2022; 15:615-623. [DOI: 10.1016/j.brs.2022.04.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 03/21/2022] [Accepted: 04/05/2022] [Indexed: 11/02/2022] Open
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Electrically stimulated auras as a potential biomarker of the epileptogenic zone. Epilepsy Behav 2021; 122:108116. [PMID: 34139619 DOI: 10.1016/j.yebeh.2021.108116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 05/24/2021] [Accepted: 05/25/2021] [Indexed: 11/23/2022]
Abstract
Electrocortical stimulation mapping (ESM) is often performed in patients undergoing stereoelectroencephalography (SEEG) prior to epilepsy surgery, with the goal of identifying functional cortex and preserving it postoperatively. ESM may also evoke a patient's typical seizure semiology. The purpose of this study was to determine whether the sites at which typical auras are evoked during ESM are associated with other known clinical and electrophysiologic biomarkers of the epileptogenic zone: the seizure onset zone (SOZ), the early spread zone (ES), and high-frequency oscillations (HFOs). We found that the sites at which auras were provoked were not consistently associated with known biomarkers (p = 0.09). We conclude that evoked auras during ESM may reflect electrical spread rather than true epileptogenicity, and that a larger study is needed to assess their potential value as independent epileptic biomarkers.
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Fox KCR, Shi L, Baek S, Raccah O, Foster BL, Saha S, Margulies DS, Kucyi A, Parvizi J. Intrinsic network architecture predicts the effects elicited by intracranial electrical stimulation of the human brain. Nat Hum Behav 2020; 4:1039-1052. [PMID: 32632334 DOI: 10.1038/s41562-020-0910-1] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 06/04/2020] [Indexed: 12/12/2022]
Abstract
Intracranial electrical stimulation (iES) of the human brain has long been known to elicit a remarkable variety of perceptual, motor and cognitive effects, but the functional-anatomical basis of this heterogeneity remains poorly understood. We conducted a whole-brain mapping of iES-elicited effects, collecting first-person reports following iES at 1,537 cortical sites in 67 participants implanted with intracranial electrodes. We found that intrinsic network membership and the principal gradient of functional connectivity strongly predicted the type and frequency of iES-elicited effects in a given brain region. While iES in unimodal brain networks at the base of the cortical hierarchy elicited frequent and simple effects, effects became increasingly rare, heterogeneous and complex in heteromodal and transmodal networks higher in the hierarchy. Our study provides a comprehensive exploration of the relationship between the hierarchical organization of intrinsic functional networks and the causal modulation of human behaviour and experience with iES.
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Affiliation(s)
- Kieran C R Fox
- Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA. .,School of Medicine, Stanford University, Stanford, CA, USA.
| | - Lin Shi
- Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA.,Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Sori Baek
- Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA
| | - Omri Raccah
- Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA
| | - Brett L Foster
- Departments of Neurosurgery and Neuroscience, Baylor College of Medicine, Houston, TX, USA
| | - Srijani Saha
- Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA
| | - Daniel S Margulies
- Centre National de la Recherche Scientifique (CNRS), UMR 7225, Frontlab, Institut du Cerveau et de la Moelle Épinière, Paris, France
| | - Aaron Kucyi
- Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA
| | - Josef Parvizi
- Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA.
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