Neural Changes in Processing Visuo-Tactile Looming Stimuli Following Hand-to-Foot Sensorimotor Remapping
Interactions with the environment follow stable spatial regularities that allow the brain to predict where sensory events are likely to occur. Although these expectations can adapt when actions repeatedly produce altered sensory consequences, whether spatial regularities learned through action influence subsequent sensory processing in the absence of action remains unclear. Participants underwent…
Neural changes in processing visuo-tactile looming stimuli following hand-to-foot sensorimotor remapping were investigated in a study involving two groups of participants. The participants underwent virtual reality (VR) training where right-hand interactions with objects produced tactile feedback either synchronously with the hand or asynchronously on their contralateral foot. The training aimed to establish a reliable action sensation relationship between hand and foot.
Before and after the VR training, electroencephalogram (EEG) recordings were taken during a visuo-tactile looming task. Participants observed objects approaching their hand while tactile stimulation was delivered to either their hand or foot, either as expected or unexpected events. The study focused on examining the mismatch negativity (MMN) and P300 brain responses to determine the influence of the learned hand-to-foot relationship on subsequent sensory processing.
The results showed that P300 responses to hand stimulation increased selectively following synchronous training. This indicates that learning a reliable hand-to-foot relationship altered subsequent processing of hand-related events outside the context of the action. However, there were no differences in MMN or P300 responses to foot stimulation between synchronous and asynchronous training. This suggests that the newly learned spatial mapping did not directly transfer to the processing of foot-related events.
Instead, the foot-related responses showed contingency-independent changes, which are consistent with more general exposure-related adaptation. These changes occurred relative to the baseline, indicating a broader adaptation to the tactile stimulation, rather than a specific adaptation to the hand-to-foot relationship.
Overall, the findings demonstrate that spatial regularities learned through active action can influence subsequent sensory processing beyond the specific context in which they were acquired. However, the extent of this influence is limited, as the learned relationship did not generalize to passive interactions involving the foot.
The study highlights the constraints on the generalization of spatial regularities between active and passive interactions, providing valuable insights into the neural mechanisms underlying sensorimotor learning and adaptation.
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