Electrophysiological Signatures of Spatial Boundaries in the Human Subiculum

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Environmental boundaries play a crucial role in spatial navigation and memory across a wide range of distantly related species. In rodents, boundary representations have been identified at the single-cell level in the subiculum and entorhinal cortex of the hippocampal formation. Although studies of hippocampal function and spatial behavior suggest that similar representations might exist in humans, boundary-related neural activity has not been identified electrophysiologically in humans until now. To address this gap in the literature, we analyzed intracranial recordings from the hippocampal formation of surgical epilepsy patients (of both sexes) while they performed a virtual spatial navigation task and compared the power in three frequency bands (1-4, 4-10, and 30-90 Hz) for target locations near and far from the environmental boundaries. Our results suggest that encoding locations near boundaries elicited stronger theta oscillations than for target locations near the center of the environment and that this difference cannot be explained by variables such as trial length, speed, movement, or performance. These findings provide direct evidence of boundary-dependent neural activity localized in humans to the subiculum, the homolog of the hippocampal subregion in which most boundary cells are found in rodents, and indicate that this system can represent attended locations that rather than the position of one's own body.
Publisher
SOC NEUROSCIENCE
Issue Date
2018-03
Language
English
Article Type
Article
Keywords

HIPPOCAMPAL THETA ACTIVITY; GRID CELLS; ENTORHINAL CORTEX; ENVIRONMENTAL BOUNDARIES; GEOMETRIC DETERMINANTS; IMAGINED NAVIGATION; NATURAL GEOMETRY; PLACE FIELDS; SELF-MOTION; 2 SYSTEMS

Citation

JOURNAL OF NEUROSCIENCE, v.38, no.13, pp.3265 - 3272

ISSN
0270-6474
DOI
10.1523/JNEUROSCI.3216-17.2018
URI
http://hdl.handle.net/10203/241449
Appears in Collection
BiS-Journal Papers(저널논문)
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