Human θ Oscillations Related to Sensorimotor Integration and Spatial Learning

TLDR

θ oscillations in the rat hippocampus have been linked to sensorimotor integration during exploratory and wayfinding behavior. We hypothesize that human cortical θ activity coordinates sensory information with motor planning to guide wayfinding toward known goal locations. We tested this by recording invasive electrophysiology from epileptic patients while they performed a spatially immersive virtual taxi driver task. We found that θ oscillations were present during both exploratory search and goal‑seeking, especially during virtual movement, with distinct topographic and spectral profiles for each phase, while β band activity reflected simple motor planning, supporting the view that human cortical θ coordinates sensory and motor processes to facilitate exploratory learning and navigation.

Abstract

θ oscillations in the rat hippocampus have been implicated in sensorimotor integration (Bland, 1986), especially during exploratory and wayfinding behavior. We propose that human cortical θ activity coordinates sensory information with a motor plan to guide wayfinding behavior to known goal locations. To test this hypothesis, we analyzed invasive recordings from epileptic patients while they performed a spatially immersive, virtual taxi driver task. Consistent with this hypothesis, we found θ oscillations during both exploratory search and goal-seeking behavior and, in particular, during virtual movement, when sensory information and motor planning were both in flux, compared with periods of self-initiated stillness. θ oscillations had different topographic and spectral characteristics during searching than during goal-seeking, suggesting that different cortical networks exhibit θ depending on which cognitive functions are driving behavior (spatial learning during exploration vs orienting to a learned representation during goal-seeking). In contrast, oscillations in the β band appeared to be related to simple motor planning, likely a variant of the Rolandic μ rhythm. These findings suggest that human cortical θ oscillations act to coordinate sensory and motor brain activity in various brain regions to facilitate exploratory learning and navigational planning.