Electrophysiological Signatures of Spatial Boundaries in the Human Subiculum.

Authors

• Sang Ah Lee
• Jonathan F Miller
• Andrew J Watrous
• Michael R Sperling
• Ashwini Sharan
• Gregory A Worrell
• Brent M Berry
• Joshua P Aronson
• Kathryn A Davis
• Robert E Gross
• Bradley Lega
• Sameer Sheth
• Sandhitsu R Das
• Joel M Stein
• Richard Gorniak
• Daniel S Rizzuto
• Joshua Jacobs

Publication/Presentation Date

3-28-2018

Abstract

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.

Volume

38

Issue

13

First Page

3265

Last Page

3272

ISSN

1529-2401

Published In/Presented At

Lee, S. A., Miller, J. F., Watrous, A. J., Sperling, M. R., Sharan, A., Worrell, G. A., Berry, B. M., Aronson, J. P., Davis, K. A., Gross, R. E., Lega, B., Sheth, S., Das, S. R., Stein, J. M., Gorniak, R., Rizzuto, D. S., & Jacobs, J. (2018). Electrophysiological Signatures of Spatial Boundaries in the Human Subiculum. The Journal of neuroscience : the official journal of the Society for Neuroscience, 38(13), 3265–3272. https://doi.org/10.1523/JNEUROSCI.3216-17.2018

Disciplines

Medicine and Health Sciences

PubMedID

29467145

Department(s)

Department of Medicine

Document Type

Article