Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy
The prefrontal cortex and hippocampus function in tight coordination during multiple cognitive processes. During spatial navigation, prefrontal neurons are linked to hippocampal theta oscillations, presumably in order to enhance communication. Hippocampal ripples have been suggested to reflect spati...
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| Format: | Article |
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MDPI AG
2021-01-01
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| Series: | Brain Sciences |
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| Online Access: | https://www.mdpi.com/2076-3425/11/2/162 |
| _version_ | 1797407231785828352 |
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| author | Aljoscha Thomschewski Eugen Trinka Julia Jacobs |
| author_facet | Aljoscha Thomschewski Eugen Trinka Julia Jacobs |
| author_sort | Aljoscha Thomschewski |
| collection | DOAJ |
| description | The prefrontal cortex and hippocampus function in tight coordination during multiple cognitive processes. During spatial navigation, prefrontal neurons are linked to hippocampal theta oscillations, presumably in order to enhance communication. Hippocampal ripples have been suggested to reflect spatial memory processes. Whether prefrontal-hippocampal-interaction also takes place within the ripple band is unknown. This intracranial EEG study aimed to investigate whether ripple band coherences can also be used to show this communication. Twelve patients with epilepsy and intracranial EEG evaluation completed a virtual spatial navigation task. We calculated ordinary coherence between prefrontal and temporal electrodes during retrieval, re-encoding, and pre-task rest. Coherences were compared between the conditions via permutation testing. Additionally, ripples events were automatically detected and changes in occurrence rates were investigated excluding ripples on epileptic spikes. Ripple-band coherences yielded no general effect of the task on coherences across all patients. Furthermore, we did not find significant effects of task conditions on ripple rates. Subsequent analyses pointed to rather short periods of synchrony as opposed to general task-related changes in ripple-band coherence. Specifically designed tasks and adopted measures might be necessary in order to map these interactions in future studies. |
| first_indexed | 2024-03-09T03:38:35Z |
| format | Article |
| id | doaj.art-8dd89125d7dc43d8a39e4167c9b14e35 |
| institution | Directory Open Access Journal |
| issn | 2076-3425 |
| language | English |
| last_indexed | 2024-03-09T03:38:35Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Brain Sciences |
| spelling | doaj.art-8dd89125d7dc43d8a39e4167c9b14e352023-12-03T14:45:19ZengMDPI AGBrain Sciences2076-34252021-01-0111216210.3390/brainsci11020162Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant EpilepsyAljoscha Thomschewski0Eugen Trinka1Julia Jacobs2Affiliated Centre of the European Reference Network EpiCARE, Department of Neurology and Centre for Cognitive Neuroscience, Christian-Doppler Medical Centre, Paracelsus Medical University, Ignaz-Harrer-Str. 79, 5020 Salzburg, AustriaAffiliated Centre of the European Reference Network EpiCARE, Department of Neurology and Centre for Cognitive Neuroscience, Christian-Doppler Medical Centre, Paracelsus Medical University, Ignaz-Harrer-Str. 79, 5020 Salzburg, AustriaMember of the European Reference Network EpiCARE, Epilepsy Center, Medical Center, Faculty of Medicine, University of Freiburg, Breisacher Straße 64, 79106 Freiburg, GermanyThe prefrontal cortex and hippocampus function in tight coordination during multiple cognitive processes. During spatial navigation, prefrontal neurons are linked to hippocampal theta oscillations, presumably in order to enhance communication. Hippocampal ripples have been suggested to reflect spatial memory processes. Whether prefrontal-hippocampal-interaction also takes place within the ripple band is unknown. This intracranial EEG study aimed to investigate whether ripple band coherences can also be used to show this communication. Twelve patients with epilepsy and intracranial EEG evaluation completed a virtual spatial navigation task. We calculated ordinary coherence between prefrontal and temporal electrodes during retrieval, re-encoding, and pre-task rest. Coherences were compared between the conditions via permutation testing. Additionally, ripples events were automatically detected and changes in occurrence rates were investigated excluding ripples on epileptic spikes. Ripple-band coherences yielded no general effect of the task on coherences across all patients. Furthermore, we did not find significant effects of task conditions on ripple rates. Subsequent analyses pointed to rather short periods of synchrony as opposed to general task-related changes in ripple-band coherence. Specifically designed tasks and adopted measures might be necessary in order to map these interactions in future studies.https://www.mdpi.com/2076-3425/11/2/162high-frequency oscillations (HFOs)spatial navigationstereo EEGfunctional connectivityEEG-coherence |
| spellingShingle | Aljoscha Thomschewski Eugen Trinka Julia Jacobs Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy Brain Sciences high-frequency oscillations (HFOs) spatial navigation stereo EEG functional connectivity EEG-coherence |
| title | Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy |
| title_full | Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy |
| title_fullStr | Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy |
| title_full_unstemmed | Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy |
| title_short | Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy |
| title_sort | temporo frontal coherences and high frequency ieeg responses during spatial navigation in patients with drug resistant epilepsy |
| topic | high-frequency oscillations (HFOs) spatial navigation stereo EEG functional connectivity EEG-coherence |
| url | https://www.mdpi.com/2076-3425/11/2/162 |
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