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• W2258843103 abstract "To circumvent the limits of muscle, ultrafast movements achieve high power through the use of springs and latches. The timescale of these movements is too short for control through typical neuromuscular mechanisms, thus ultrafast movements are either invariant or are controlled prior to movement. We tested whether mantis shrimp (Stomatopoda: Neogonodactylus bredini) vary their ultrafast smashing strikes and, if so, how this control is achieved prior to movement. We collected high speed images of strike mechanics and electromyograms of the extensor and flexor muscles that control spring compression and latch release. During spring compression, lateral extensor and flexor units were co-activated. The strike initiated several milliseconds after the flexor units ceased, suggesting that flexor activity prevents spring release and determines the timing of strike initiation. We used linear mixed models and Akaike Information Criterion to serially evaluate multiple hypotheses for control mechanisms. We found that variation in spring compression and strike angular velocity were statistically explained by spike activity of the extensor muscle. The results show that mantis shrimp can generate kinematically variable strikes and that their kinematics can be changed through adjustments to motor activity prior to the movement, thus supporting an upstream, central nervous system-based control of ultrafast movement. Based on these and other findings, we present a shishiodoshi model that illustrates alternative models of control in biological ballistic systems. The discovery of feed-forward control in mantis shrimp sets the stage for the assessment of targets, strategic variation in kinematics and the role of learning in ultrafast animals." @default.
• W2258843103 created "2016-06-24" @default.
• W2258843103 creator A5013918685 @default.
• W2258843103 creator A5087124626 @default.
• W2258843103 date "2015-01-01" @default.
• W2258843103 modified "2023-10-02" @default.
• W2258843103 title "Feed-forward motor control of ultrafast, ballistic movements" @default.
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• W2258843103 doi "https://doi.org/10.1242/jeb.130518" @default.
• W2258843103 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26643091" @default.
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