Multi-scale goal distance representations in human hippocampus during virtual spatial navigation

J Liu, D Chen, X Xiao, H Zhang, W Zhou, S Liang… - Current Biology, 2023 - cell.com
J Liu, D Chen, X Xiao, H Zhang, W Zhou, S Liang, L Kunz, A Schulze-Bonhage, N Axmacher
Current Biology, 2023cell.com
Goal-directed navigation relies on both coarse and fine-grained coding of spatial distance
between the current position of a navigating subject and a goal destination. However, the
neural signatures underlying goal distance coding remain poorly understood. Using
intracranial EEG recordings from the hippocampus of drug-resistant epilepsy patients who
performed a virtual spatial navigation task, we found that the right hippocampal theta power
was significantly modulated by goal distance and decreased with goal proximity. This …
Summary
Goal-directed navigation relies on both coarse and fine-grained coding of spatial distance between the current position of a navigating subject and a goal destination. However, the neural signatures underlying goal distance coding remain poorly understood. Using intracranial EEG recordings from the hippocampus of drug-resistant epilepsy patients who performed a virtual spatial navigation task, we found that the right hippocampal theta power was significantly modulated by goal distance and decreased with goal proximity. This modulation varied along the hippocampal longitudinal axis such that theta power in the posterior hippocampus decreased more strongly with goal proximity. Similarly, neural timescale, reflecting the duration across which information can be maintained, increased gradually from the posterior to anterior hippocampus. Taken together, this study provides empirical evidence for multi-scale spatial representations of goal distance in the human hippocampus and links the hippocampal processing of spatial information to its intrinsic temporal dynamics.
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