Timings of attentional switching to perturbation and postural preparation during transient forward or backward floor translation

摘要

BackgroundRelationships between the timings of attentional switching and postural preparation were investigated using a choice-reaction paradigm with transient floor translation (S2), with the direction indicated by a warning auditory signal (S1). MethodsThirteen healthy young adults participated in this study. S2 started 2?s after S1 onset while standing on the platform. The platform moved forward when S1 was a high tone, and backward when S1 was a low tone. In the S1–S2 period, attentional switching was evaluated by P3 component of event-related potential. ResultsA shift in the center of pressure in the anteroposterior direction (CoPap) or a continuous increase in postural muscle activation toward S2 was recognized as postural preparation. Changes in postural muscle activation were found just before the CoPap shift. P3 was observed about 250–650?ms after S1. Onset of postural preparation was significantly later (about 200?ms) than latency of P3 ( p ConclusionPostural preparation for S2 was demonstrated to start after attentional switching from S1 to S2.