Serving performance in a suprapostural visual signal detection task: context-dependent and direction-specific control of body sway with fingertip light touch
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When upright stance body sway is increased during horizontal oscillatory smooth pursuit, it may indicate interference between oculomotor and sway control, potentially due to an efferent oculomotor signal . In specific contexts, however, body sway reduction has also been reported during smooth pursuit . Riccio and Stoffregen  argued that the postural control system also takes into account an individual’s behavioural goals, such as performance in a “suprapostural” task, especially when the task imposes visual demands in contrast to cognitive demands . Therefore, sway may be dampened proactively to reduce self-imposed variability and to improve oculomotor accuracy during visual tracking or reduce retinal slip in a visual discrimination task [2, 5, 6]. Similarly, precision control of fingertip light touch (LT) with an earth-fixed reference, which most reliably reduces body sway , has been considered a suprapostural task . The interpretation of proactive sway...
We are grateful for Max Hünemörder’s programming support as well as funding received from the Federal Ministry of Education and Research of Germany (BMBF; 01EO1401) and from the Deutsche Forschungsgemeinschaft (DFG) through the TUM International Graduate School of Science and Engineering (IGSSE).
Compliance with ethical standards
Conflicts of interest
The authors declare that they have no conflict of interest.
The study accorded to the ethical principles laid down in the 1964 Declaration of Helsinki and its later amendments and was approved by the Technical University of Munich Ethics Committee. All participants gave their informed consent prior to their inclusion in the study.
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