Motor Performance and Motor Learning in Sustained +3 G&lt;SUB&gt;z&lt;/SUB&gt; Acceleration

Guardiera, Simon; Schneider, Stefan; Noppe, Alexandra; Strüder, Heiko K.

doi:10.3357/asem.2306.2008

Cited by 3 publications

(3 citation statements)

References 17 publications

(28 reference statements)

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“…Firstly, we performed a case study where +Gz load was induced by a long-arm human centrifuge (LAHC). Secondly, we conducted an experiment under normogravity and simulated +Gz loads by additional arm weighting [7]. Using a visuomotor task, we aimed to investigate the impact of increased gravity loads on size and distance of a given target interface evaluated on direct object selection by the performance and physiological workload.…”

Section: Research Objectivementioning

confidence: 99%

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Enhancement of Direct Augmented Reality Object Selection by Gravity-Adapted Target Resizing

Markov-Vetter

Zander

Latsch

et al. 2016

Communications in Computer and Information Science

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Abstract. Direct object selection in an Augmented Reality environment that is coded outside of human body frame of reference is deteriorated under short-term altered gravity. As countermeasures we developed a gravity-adapted resizing technique based on the Hooke's law that resulted in two techniques of target and interface deformation (compression, elongation). To prove the concept of this resizing approach we initially conducted two experiments under simulated hypergravity conditions. While during the first study hypergravity was induced by a long-arm human centrifuge, in the second study hypergravity was simulated by additional arm weightings that were balanced and attached to the participants' pointing arm. We investigated the difference of the task performance with respect to the pointing frequency, response time, pointing speed and accuracy, when participants performed a visuomotor task under the resizing conditions compared to the unchanged condition. During the second study we additionally evaluated the speed-accuracy tradeoff of the resizing techniques according to Fitts' law and the physiological workload by cardiac responses analyzing the heart rate variability. Both experiments showed that the online adaption of the present gravity load to targets' size and distance influences the performance of direct AR direct pointing. The results revealed that the pointing performance benefits from elongation target deformation by increased target sizes and distances, while pointing towards compressed targets mostly decreases the physiological workload under increased gravity conditions.

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Section: Research Objectivementioning

confidence: 99%

“…For simulation the +Gz loads we used corresponding weightings [7] that were balanced attached to the participant's dominant forearm (see Fig. 6).…”

Section: Second Experiment: User Study By Arm Weightingsmentioning

confidence: 99%

Enhancement of Direct Augmented Reality Object Selection by Gravity-Adapted Target Resizing

Markov-Vetter

Zander

Latsch

et al. 2016

Communications in Computer and Information Science

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“…Most often, this is caused by the strain of concentration, the constant focus of the pilot on piloting operations and the situation in the air. Moreover, sleep defi ciency may aff ect short-term memory, self-assessment of the level of alertness (necessary to safely continue the fl ight), limitation of analytical and abstract thinking, situation assessment, planning and decision-making skills, multi-directional thinking skills or verbal communication skills [15,16,19,20].…”

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confidence: 99%

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2020

PJAMBP

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Visual Field Motion Effects on the Production of Manual Forces and Displacements

Dalecki¹,

Bock²,

Guardiera³

2009

aviat space environ med

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The present pattern of findings is similar to that yielded previously in +3 Gz, which supports the existence of a common underlying mechanism. Specifically, we suggest that +3 Gz and vertical field motion stimulate the vestibular system, and that the observed exaggeration of produced force is due to vestibular modulation of descending volitional motor commands. The fact that displacements were not affected by +3 Gz and moving visual fields would then indicate that forces and displacements are controlled through distinct pathways which interact differently with the vestibular system.

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Motor Performance and Motor Learning in Sustained +3 G<SUB>z</SUB> Acceleration

Abstract: Deficits in tracking performance are probably not due to mechanical impairment or timing deficits, but rather reflect effects on accuracy due to vestibulo-spinal influences or the stressful environment at +3 Gz However, these effects do not impair motor learning.

Cited by 3 publications

References 17 publications

Enhancement of Direct Augmented Reality Object Selection by Gravity-Adapted Target Resizing

Enhancement of Direct Augmented Reality Object Selection by Gravity-Adapted Target Resizing

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Visual Field Motion Effects on the Production of Manual Forces and Displacements

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