caa a22 4500 445352639 CHVBK 20180317142849.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00221-011-2892-8 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2892-8 Torres Elizabeth Psychology Department (Busch Campus), Rutgers University, 152 Frelinghuysen Rd, 08854, Piscataway, NJ, USA aut Two classes of movements in motor control [Elektronische Daten] [Elizabeth Torres] This work investigated whether fundamental differences emerged between segments of complex movement sequences performed at different instructed speeds. To this end, we tested 5 novices and 1 karate expert as they performed beginner's martial arts routines. We found that if one blindly took these segments and separated them according to the variability of trajectory parameters, one could unambiguously group two classes of movements between the same two space regions: one type that remained quite conserved despite speed changes and another type that changed with speed level. These groups corresponded to functionally different movements (strike segments explicitly directed to a set of goals and spontaneously retracting segments supplementing the goals). The curvature of the goal-directed segments remained quite conserved despite speed changes, yet the supplemental movements spanned families of trajectories with different curvature according to the speed. Likewise, the values of the hand's peak velocity across trials were more variable in supplemental segments, and for each participant, there were different statistical signatures of variability between the two movement classes. This dichotomy between coexisting movement classes of our natural actions calls for a theoretical characterization. The present experimental results strongly suggest that two separate sets of principles may govern these movement classes in complex natural behaviors, since under different dynamics the hand did not describe a unique family of trajectories between the same two points in the 3D space. Springer-Verlag, 2011 Goal-directed movements nationallicence Supplemental movements nationallicence Speeds nationallicence Blind classification nationallicence Kinesthetic sense nationallicence Martial arts nationallicence Maximum velocity nationallicence Experimental Brain Research Springer-Verlag 215/3-4(2011-12-01), 269-283 0014-4819 215:3-4<269 2011 215 221 https://doi.org/10.1007/s00221-011-2892-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2892-8 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Torres Elizabeth Psychology Department (Busch Campus), Rutgers University, 152 Frelinghuysen Rd, 08854, Piscataway, NJ, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 215/3-4(2011-12-01), 269-283 0014-4819 215:3-4<269 2011 215 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer