Abstract
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 < 0.001) and correlated strongly with P3 latency (forward: r = 0.81, backward: r = 0.74, p < 0.01).ConclusionPostural preparation for S2 was demonstrated to start after attentional switching from S1 to S2.
Highlights
Relationships 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)
In this study, timing relationships between attentional switching and postural preparation were investigated, using the S1–S2 choice-reaction paradigm with transient forward or backward floor translation (S2), with the direction indicated by S1
In response to S2 for both directions, no significant differences between tasks were found in center of pressure in the anteroposterior direction (CoPap) displaced position, onset time, peak time or peak amplitude of each postural muscle activation (Table 1)
Summary
Relationships 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). We have investigated attentional allocation directed to postural control associated with floor translations, using event-related brain potential (ERP) [7, 8]. The present study set a choice-reaction paradigm with transient floor translation (S2), where S2 direction changed forward or backward in accordance with the preceding S1. In this S1–S2 choice-reaction paradigm, S1 has roles in both indicating translation direction and acting as a warning signal. Attentional switching can be evaluated by the P3 component of ERP, as described below
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